The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform
Liangbing Hu - One of the best experts on this subject based on the ideXlab platform.
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Transient Behavior of the Metal Interface in Lithium Metal-Garnet Batteries.
Angewandte Chemie, 2017Co-Authors: Kun Kelvin Fu, Zhezhen Fu, Yunhui Gong, Eric D. Wachsman, Marcus Carter, Liangbing HuAbstract:The interface between solid electrolytes and Li metal is a primary issue for solid-state batteries. Introducing a metal interlayer to conformally coat solid electrolytes can improve the interface wettability of Li metal and reduce the Interfacial Resistance, but the mechanism of the metal interlayer is unknown. In this work, we used magnesium (Mg) as a model to investigate the effect of a metal coating on the Interfacial Resistance of a solid electrolyte and Li metal anode. Our motivation is to understand how the metal interlayer behaves at the interface to promote increased Li-metal wettability of the solid electrolyte surface and reduce Interfacial Resistance. Surprisingly, we found that the metal coating dissolved in the molten piece of Li and diffused into the bulk Li metal, leading to a small and stable Interfacial Resistance between the garnet solid electrolyte and the Li metal.
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reducing Interfacial Resistance between garnet structured solid state electrolyte and li metal anode by a germanium layer
Advanced Materials, 2017Co-Authors: Yunhui Gong, Glenn R. Pastel, Yifei Mo, Kun Kelvin Fu, Eric D. Wachsman, Yiju Li, Ying Zhang, Liangbing HuAbstract:: Substantial efforts are underway to develop all-solid-state Li batteries (SSLiBs) toward high safety, high power density, and high energy density. Garnet-structured solid-state electrolyte exhibits great promise for SSLiBs owing to its high Li-ion conductivity, wide potential window, and sufficient thermal/chemical stability. A major challenge of garnet is that the contact between the garnet and the Li-metal anodes is poor due to the rigidity of the garnet, which leads to limited active sites and large Interfacial Resistance. This study proposes a new methodology for reducing the garnet/Li-metal Interfacial Resistance by depositing a thin germanium (Ge) (20 nm) layer on garnet. By applying this approach, the garnet/Li-metal Interfacial Resistance decreases from ≈900 to ≈115 Ω cm2 due to an alloying reaction between the Li metal and the Ge. In agreement with experiments, first-principles calculation confirms the good stability and improved wetting at the interface between the lithiated Ge layer and garnet. In this way, this unique Ge modification technique enables a stable cycling performance of a full cell of lithium metal, garnet electrolyte, and LiFePO4 cathode at room temperature.
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Transient Behavior of the Metal Interface in Lithium Metal–Garnet Batteries
Angewandte Chemie - International Edition, 2017Co-Authors: Kun Kelvin Fu, Zhezhen Fu, Boyang Liu, Hua Xie, Yonggang Yao, Yunhui Gong, Eric D. Wachsman, Marcus Carter, Liangbing HuAbstract:© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. The interface between solid electrolytes and Li metal is a primary issue for solid-state batteries. Introducing a metal interlayer to conformally coat solid electrolytes can improve the interface wettability of Li metal and reduce the Interfacial Resistance, but the mechanism of the metal interlayer is unknown. In this work, we used magnesium (Mg) as a model to investigate the effect of a metal coating on the Interfacial Resistance of a solid electrolyte and Li metal anode. The Li-Mg alloy has low overpotential, leading to a lower Interfacial Resistance. Our motivation is to understand how the metal interlayer behaves at the interface to promote increased Li-metal wettability of the solid electrolyte surface and reduce Interfacial Resistance. Surprisingly, we found that the metal coating dissolved in the molten piece of Li and diffused into the bulk Li metal, leading to a small and stable Interfacial Resistance between the garnet solid electrolyte and the Li metal. We also found that the Interfacial Resistance did not change with increase in the thickness of the metal coating (5, 10, and 100nm), due to the transient behavior of the metal interface layer.
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Garnet Solid Electrolyte Protected Li-Metal Batteries
ACS Applied Materials and Interfaces, 2017Co-Authors: Boyang Liu, Glenn R. Pastel, Chun Peng Yang, Hua Xie, Yonggang Yao, Xiaogang Han, Yunhui Gong, Kun Fu, Eric D. Wachsman, Liangbing HuAbstract:Garnet-type solid state electrolyte (SSE) is a promising candidate for high performance lithium (Li)-metal batteries due to its good stability and high ionic conductivity. One of the main challenges for garnet solid state batteries is the poor solid–solid contact between the garnet and electrodes, which results in high Interfacial Resistance, large polarizations, and low efficiencies in batteries. To address this challenge, in this work gel electrolyte is used as an interlayer between solid electrolyte and solid electrodes to improve their contact and reduce their Interfacial Resistance. The gel electrolyte has a soft structure, high ionic conductivity, and good wettability. Through construction of the garnet/gel interlayer/electrode structure, the Interfacial Resistance of the garnet significantly decreased from 6.5 × 104 to 248 Ω cm2 for the cathode and from 1.4 × 103 to 214 Ω cm2 for the Li-metal anode, successfully demonstrating a full cell with high capacity (140 mAh/g for LiFePO4 cathode) over 70 st...
Yunhui Gong - One of the best experts on this subject based on the ideXlab platform.
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Transient Behavior of the Metal Interface in Lithium Metal-Garnet Batteries.
Angewandte Chemie, 2017Co-Authors: Kun Kelvin Fu, Zhezhen Fu, Yunhui Gong, Eric D. Wachsman, Marcus Carter, Liangbing HuAbstract:The interface between solid electrolytes and Li metal is a primary issue for solid-state batteries. Introducing a metal interlayer to conformally coat solid electrolytes can improve the interface wettability of Li metal and reduce the Interfacial Resistance, but the mechanism of the metal interlayer is unknown. In this work, we used magnesium (Mg) as a model to investigate the effect of a metal coating on the Interfacial Resistance of a solid electrolyte and Li metal anode. Our motivation is to understand how the metal interlayer behaves at the interface to promote increased Li-metal wettability of the solid electrolyte surface and reduce Interfacial Resistance. Surprisingly, we found that the metal coating dissolved in the molten piece of Li and diffused into the bulk Li metal, leading to a small and stable Interfacial Resistance between the garnet solid electrolyte and the Li metal.
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reducing Interfacial Resistance between garnet structured solid state electrolyte and li metal anode by a germanium layer
Advanced Materials, 2017Co-Authors: Yunhui Gong, Glenn R. Pastel, Yifei Mo, Kun Kelvin Fu, Eric D. Wachsman, Yiju Li, Ying Zhang, Liangbing HuAbstract:: Substantial efforts are underway to develop all-solid-state Li batteries (SSLiBs) toward high safety, high power density, and high energy density. Garnet-structured solid-state electrolyte exhibits great promise for SSLiBs owing to its high Li-ion conductivity, wide potential window, and sufficient thermal/chemical stability. A major challenge of garnet is that the contact between the garnet and the Li-metal anodes is poor due to the rigidity of the garnet, which leads to limited active sites and large Interfacial Resistance. This study proposes a new methodology for reducing the garnet/Li-metal Interfacial Resistance by depositing a thin germanium (Ge) (20 nm) layer on garnet. By applying this approach, the garnet/Li-metal Interfacial Resistance decreases from ≈900 to ≈115 Ω cm2 due to an alloying reaction between the Li metal and the Ge. In agreement with experiments, first-principles calculation confirms the good stability and improved wetting at the interface between the lithiated Ge layer and garnet. In this way, this unique Ge modification technique enables a stable cycling performance of a full cell of lithium metal, garnet electrolyte, and LiFePO4 cathode at room temperature.
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Reducing Interfacial Resistance between Garnet-Structured Solid-State Electrolyte and Li-Metal Anode by a Germanium Layer
Advanced Materials, 2017Co-Authors: Wei Luo, Chuan-fu Lin, Glenn R. Pastel, Yizhou Zhu, Yonggang Yao, Yunhui Gong, Kun Kelvin Fu, Yiju Li, Ying Zhang, Yifei MoAbstract:Lithium-ion batteries (LIBs) are used globally in powering port-able electronics and now electric vehicles. [1–3] Most commercial LIBs use organic electrolytes, in which the fast ion kinetics in a liquid environment are critical to activating electrode mate-rials. [4] However, safety concerns continually arise from the high combustibility of organic electrolytes. In contrast, inorganic Substantial efforts are underway to develop all-solid-state Li batteries (SSLiBs) toward high safety, high power density, and high energy density. Garnet-structured solid-state electrolyte exhibits great promise for SSLiBs owing to its high Li-ion conductivity, wide potential window, and sufficient thermal/ chemical stability. A major challenge of garnet is that the contact between the garnet and the Li-metal anodes is poor due to the rigidity of the garnet, which leads to limited active sites and large Interfacial Resistance. This study proposes a new methodology for reducing the garnet/Li-metal Interfacial Resistance by depositing a thin germanium (Ge) (20 nm) layer on garnet. By applying this approach, the garnet/Li-metal Interfacial Resistance decreases from ≈900 to ≈115 Ω cm 2 due to an alloying reaction between the Li metal and the Ge. In agreement with experiments, first-principles calculation confirms the good stability and improved wetting at the interface between the lithiated Ge layer and garnet. In this way, this unique Ge modification technique enables a stable cycling performance of a full cell of lithium metal, garnet electrolyte, and LiFePO 4 cathode at room temperature. Electrolytes
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Transient Behavior of the Metal Interface in Lithium Metal–Garnet Batteries
Angewandte Chemie - International Edition, 2017Co-Authors: Kun Kelvin Fu, Zhezhen Fu, Boyang Liu, Hua Xie, Yonggang Yao, Yunhui Gong, Eric D. Wachsman, Marcus Carter, Liangbing HuAbstract:© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. The interface between solid electrolytes and Li metal is a primary issue for solid-state batteries. Introducing a metal interlayer to conformally coat solid electrolytes can improve the interface wettability of Li metal and reduce the Interfacial Resistance, but the mechanism of the metal interlayer is unknown. In this work, we used magnesium (Mg) as a model to investigate the effect of a metal coating on the Interfacial Resistance of a solid electrolyte and Li metal anode. The Li-Mg alloy has low overpotential, leading to a lower Interfacial Resistance. Our motivation is to understand how the metal interlayer behaves at the interface to promote increased Li-metal wettability of the solid electrolyte surface and reduce Interfacial Resistance. Surprisingly, we found that the metal coating dissolved in the molten piece of Li and diffused into the bulk Li metal, leading to a small and stable Interfacial Resistance between the garnet solid electrolyte and the Li metal. We also found that the Interfacial Resistance did not change with increase in the thickness of the metal coating (5, 10, and 100nm), due to the transient behavior of the metal interface layer.
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Garnet Solid Electrolyte Protected Li-Metal Batteries
ACS Applied Materials and Interfaces, 2017Co-Authors: Boyang Liu, Glenn R. Pastel, Chun Peng Yang, Hua Xie, Yonggang Yao, Xiaogang Han, Yunhui Gong, Kun Fu, Eric D. Wachsman, Liangbing HuAbstract:Garnet-type solid state electrolyte (SSE) is a promising candidate for high performance lithium (Li)-metal batteries due to its good stability and high ionic conductivity. One of the main challenges for garnet solid state batteries is the poor solid–solid contact between the garnet and electrodes, which results in high Interfacial Resistance, large polarizations, and low efficiencies in batteries. To address this challenge, in this work gel electrolyte is used as an interlayer between solid electrolyte and solid electrodes to improve their contact and reduce their Interfacial Resistance. The gel electrolyte has a soft structure, high ionic conductivity, and good wettability. Through construction of the garnet/gel interlayer/electrode structure, the Interfacial Resistance of the garnet significantly decreased from 6.5 × 104 to 248 Ω cm2 for the cathode and from 1.4 × 103 to 214 Ω cm2 for the Li-metal anode, successfully demonstrating a full cell with high capacity (140 mAh/g for LiFePO4 cathode) over 70 st...
Jeff Sakamoto - One of the best experts on this subject based on the ideXlab platform.
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surface chemistry mechanism of ultra low Interfacial Resistance in the solid state electrolyte li7la3zr2o12
Chemistry of Materials, 2017Co-Authors: Asma Sharafi, Eric Kazyak, Andrew L Davis, Seungho Yu, Travis Thompson, Donald J Siegel, Neil P Dasgupta, Jeff SakamotoAbstract:The impact of surface chemistry on the Interfacial Resistance between the Li7La3Zr2O12 (LLZO) solid-state electrolyte and a metallic Li electrode is revealed. Control of surface chemistry allows the Interfacial Resistance to be reduced to 2 Ω cm2, lower than that of liquid electrolytes, without the need for interlayer coatings. A mechanistic understanding of the origins of ultra-low Resistance is provided by quantitatively evaluating the linkages between Interfacial chemistry, Li wettability, and electrochemical phenomena. A combination of Li contact angle measurements, X-ray photoelectron spectroscopy (XPS), first-principles calculations, and impedance spectroscopy demonstrates that the presence of common LLZO surface contaminants, Li2CO3 and LiOH, result in poor wettability by Li and high Interfacial Resistance. On the basis of this mechanism, a simple procedure for removing these surface layers is demonstrated, which results in a dramatic increase in Li wetting and the elimination of nearly all interfa...
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impact of air exposure and surface chemistry on li li7la3zr2o12 Interfacial Resistance
Journal of Materials Chemistry, 2017Co-Authors: Asma Sharafi, Seungho Yu, Donald J Siegel, Michael Naguib, Harry M Meyer, Jagjit Nanda, Jeff SakamotoAbstract:Li7La3Zr2O12 (LLZO) is a promising solid-state electrolyte that could enable solid-state-batteries (SSB) employing metallic Li anodes. For a SSB to be viable, the stability and charge transfer kinetics at the Li–LLZO interface should foster facile plating and stripping of Li. Contrary to these goals, recent studies have reported high Li–LLZO Interfacial Resistance which was attributed to a contamination layer that forms upon exposure of LLZO to air. This study clarifies the mechanisms and consequences associated with air exposure of LLZO; additionally, strategies to minimize these effects are described. First-principles calculations reveal that LLZO readily reacts with humid air; the most favorable reaction pathway involves protonation of LLZO and formation of Li2CO3. X-ray photoelectron spectroscopy, scanning electron microscopy, Raman spectroscopy, and transmission electron microscopy were used to characterize the surface and subsurface chemistry of LLZO as a function of relative humidity and exposure time. Additionally, electrochemical impedance spectroscopy was used to measure the Li–LLZO Interfacial Resistance as a function of surface contamination. These data indicate that air exposure-induced contamination impacts the Interfacial Resistance significantly, when exposure time exceeds 24 h. The results of this study provide valuable insight into the sensitivity of LLZO to air and how the effects of air contamination can be reversed.
Yutao Li - One of the best experts on this subject based on the ideXlab platform.
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Dual interface layers for solid-state Li metal battery with low Interfacial Resistance and small polarization based on garnet electrolyte
Electrochimica Acta, 2020Co-Authors: Linhui Chen, Yutao Li, Zeya Huang, Wanying Pang, Chang-an WangAbstract:Abstract Garnet-type electrolyte gains extensive attention because of high Li-ion conductivity and excellent stability with Li anode. However, the two major bottlenecks hindering its practical application are high Interfacial Resistance and fast Li dendrite growth in solid-state Li metal battery. Here we prepare highly dense garnet electrolyte by hot-press sintering and introduce dual interface layers consisting of polydopamine (PDA) film and poly(ethylene oxide)-based composite electrolyte layer at the electrode/garnet interface to improve the Li-ion transfer at the interface. The adhesive PDA film helps to realize tight interface bonding. The composite electrolyte layer improves the garnet/electrode Interfacial contact and promotes Li+ transport across the interface.The Li/garnet Interfacial Resistance decreases to 171 Ω cm2. Correspondingly, the symmetric cell exhibits flat voltage plateau and small polarization voltage for over 500 h without Li dendrite formation, indicating the stable Li/garnet interface during cycling. The solid-state Li/garnet/LiFePO4 battery exhibits high initial capacity (161.4 mA h g−1) with a high coulombic efficiency of 99.6% and small overpotential of 0.04 V at 80 °C. This work provides a feasible option to address the Interfacial challenge and promotes the development of high performance solid-state Li metal battery.
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polymer lithium garnet interphase for an all solid state rechargeable battery
Nano Energy, 2018Co-Authors: Weidong Zhou, Sen Xin, Y Zhu, Nicholas Grundish, Shaofei Wang, Ya You, Nan Wu, Jian Gao, Zhiming Cui, Yutao LiAbstract:Abstract Garnet electrolytes having a room-temperature Li + conductivity of 10 −3 S cm −1 suffer from adsorbents that prevent wetting by a lithium anode; formation and growth of lithium-anode dendrites into grain boundaries and a huge Interfacial Resistance to anode plating and stripping result. A thin coating of a garnet surface by a Li + -conducting polymer with a transfer number of 0.9 is shown to suppress dendrite formation and to reduce greatly the Interfacial Resistance. A coulombic efficiency near 100% with a single thin polymer coat can provide Li/garnet/LiFePO 4 all-solid-state cell with a long cycle life.
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hybrid polymer garnet electrolyte with a small Interfacial Resistance for lithium ion batteries
Angewandte Chemie, 2017Co-Authors: Yutao Li, Arumugan Manthiram, Huanan Duan, Xujie Lü, Biyi Xu, Henghui Xu, Gengtao Fu, Weidong Zhou, John B GoodenoughAbstract:Li7La3Zr2O12-based Li-rich garnets react with water and carbon dioxide in air to form a Li-ion insulating Li2CO3 layer on the surface of the garnet particles, which results in a large Interfacial Resistance for Li-ion transfer. Here, we introduce LiF to garnet Li6.5La3Zr1.5Ta0.5O12 (LLZT) to increase the stability of the garnet electrolyte against moist air; the garnet LLZT-2 wt % LiF (LLZT-2LiF) has less Li2CO3 on the surface and shows a small Interfacial Resistance with Li metal, a solid polymer electrolyte, and organic-liquid electrolytes. An all-solid-state Li/polymer/LLZT-2LiF/LiFePO4 battery has a high Coulombic efficiency and long cycle life; a Li-S cell with the LLZT-2LiF electrolyte as a separator, which blocks the polysulfide transport towards the Li-metal, also has high Coulombic efficiency and kept 93 % of its capacity after 100 cycles.
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Hybrid Polymer/Garnet Electrolyte with a Small Interfacial Resistance for Lithium-Ion Batteries
Angewandte Chemie - International Edition, 2017Co-Authors: Yutao Li, Huanan Duan, Leigang Xue, Xujie Lü, Biyi Xu, Henghui Xu, Gengtao Fu, Sen Xin, Weidong Zhou, Arumugan ManthiramAbstract:Li7La3Zr2O12-based Li-rich garnets react with water and carbon dioxide in air to form a Li-ion insulating Li2CO3 layer on the surface of the garnet particles, which results in a large Interfacial Resistance for Li-ion transfer. Here, we introduce LiF to garnet Li6.5La3Zr1.5Ta0.5O12 (LLZT) to increase the stability of the garnet electrolyte against moist air; the garnet LLZT-2 wt % LiF (LLZT-2LiF) has less Li2CO3 on the surface and shows a small Interfacial Resistance with Li metal, a solid polymer electrolyte, and organic-liquid electrolytes. An all-solid-state Li/polymer/LLZT-2LiF/LiFePO4 battery has a high Coulombic efficiency and long cycle life; a Li-S cell with the LLZT-2LiF electrolyte as a separator, which blocks the polysulfide transport towards the Li-metal, also has high Coulombic efficiency and kept 93 % of its capacity after 100 cycles.
Glenn R. Pastel - One of the best experts on this subject based on the ideXlab platform.
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reducing Interfacial Resistance between garnet structured solid state electrolyte and li metal anode by a germanium layer
Advanced Materials, 2017Co-Authors: Yunhui Gong, Glenn R. Pastel, Yifei Mo, Kun Kelvin Fu, Eric D. Wachsman, Yiju Li, Ying Zhang, Liangbing HuAbstract:: Substantial efforts are underway to develop all-solid-state Li batteries (SSLiBs) toward high safety, high power density, and high energy density. Garnet-structured solid-state electrolyte exhibits great promise for SSLiBs owing to its high Li-ion conductivity, wide potential window, and sufficient thermal/chemical stability. A major challenge of garnet is that the contact between the garnet and the Li-metal anodes is poor due to the rigidity of the garnet, which leads to limited active sites and large Interfacial Resistance. This study proposes a new methodology for reducing the garnet/Li-metal Interfacial Resistance by depositing a thin germanium (Ge) (20 nm) layer on garnet. By applying this approach, the garnet/Li-metal Interfacial Resistance decreases from ≈900 to ≈115 Ω cm2 due to an alloying reaction between the Li metal and the Ge. In agreement with experiments, first-principles calculation confirms the good stability and improved wetting at the interface between the lithiated Ge layer and garnet. In this way, this unique Ge modification technique enables a stable cycling performance of a full cell of lithium metal, garnet electrolyte, and LiFePO4 cathode at room temperature.
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Reducing Interfacial Resistance between Garnet-Structured Solid-State Electrolyte and Li-Metal Anode by a Germanium Layer
Advanced Materials, 2017Co-Authors: Wei Luo, Chuan-fu Lin, Glenn R. Pastel, Yizhou Zhu, Yonggang Yao, Yunhui Gong, Kun Kelvin Fu, Yiju Li, Ying Zhang, Yifei MoAbstract:Lithium-ion batteries (LIBs) are used globally in powering port-able electronics and now electric vehicles. [1–3] Most commercial LIBs use organic electrolytes, in which the fast ion kinetics in a liquid environment are critical to activating electrode mate-rials. [4] However, safety concerns continually arise from the high combustibility of organic electrolytes. In contrast, inorganic Substantial efforts are underway to develop all-solid-state Li batteries (SSLiBs) toward high safety, high power density, and high energy density. Garnet-structured solid-state electrolyte exhibits great promise for SSLiBs owing to its high Li-ion conductivity, wide potential window, and sufficient thermal/ chemical stability. A major challenge of garnet is that the contact between the garnet and the Li-metal anodes is poor due to the rigidity of the garnet, which leads to limited active sites and large Interfacial Resistance. This study proposes a new methodology for reducing the garnet/Li-metal Interfacial Resistance by depositing a thin germanium (Ge) (20 nm) layer on garnet. By applying this approach, the garnet/Li-metal Interfacial Resistance decreases from ≈900 to ≈115 Ω cm 2 due to an alloying reaction between the Li metal and the Ge. In agreement with experiments, first-principles calculation confirms the good stability and improved wetting at the interface between the lithiated Ge layer and garnet. In this way, this unique Ge modification technique enables a stable cycling performance of a full cell of lithium metal, garnet electrolyte, and LiFePO 4 cathode at room temperature. Electrolytes
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Garnet Solid Electrolyte Protected Li-Metal Batteries
ACS Applied Materials and Interfaces, 2017Co-Authors: Boyang Liu, Glenn R. Pastel, Chun Peng Yang, Hua Xie, Yonggang Yao, Xiaogang Han, Yunhui Gong, Kun Fu, Eric D. Wachsman, Liangbing HuAbstract:Garnet-type solid state electrolyte (SSE) is a promising candidate for high performance lithium (Li)-metal batteries due to its good stability and high ionic conductivity. One of the main challenges for garnet solid state batteries is the poor solid–solid contact between the garnet and electrodes, which results in high Interfacial Resistance, large polarizations, and low efficiencies in batteries. To address this challenge, in this work gel electrolyte is used as an interlayer between solid electrolyte and solid electrodes to improve their contact and reduce their Interfacial Resistance. The gel electrolyte has a soft structure, high ionic conductivity, and good wettability. Through construction of the garnet/gel interlayer/electrode structure, the Interfacial Resistance of the garnet significantly decreased from 6.5 × 104 to 248 Ω cm2 for the cathode and from 1.4 × 103 to 214 Ω cm2 for the Li-metal anode, successfully demonstrating a full cell with high capacity (140 mAh/g for LiFePO4 cathode) over 70 st...