The Experts below are selected from a list of 25098 Experts worldwide ranked by ideXlab platform
Yaohui Zhang - One of the best experts on this subject based on the ideXlab platform.
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demonstration of an electrochemical liquid cell for operando transmission electron microscopy observation of the Lithiation deLithiation behavior of si nanowire battery anodes
Nano Letters, 2013Co-Authors: Lucas R Parent, Layla B Mehdi, Raymond R Unocic, Matthew T Mcdowell, Robert L Sacci, Justin G Connell, Patricia Abellan, Xilin Chen, Yaohui ZhangAbstract:Over the past few years, in situ transmission electron microscopy (TEM) studies of lithium ion batteries using an open-cell configuration have helped us to gain fundamental insights into the structural and chemical evolution of the electrode materials in real time. In the standard open-cell configuration, the electrolyte is either solid lithium oxide or an ionic liquid, which is point-contacted with the electrode. This cell design is inherently different from a real battery, where liquid electrolyte forms conformal contact with electrode materials. The knowledge learnt from open cells can deviate significantly from the real battery, calling for operando TEM technique with conformal liquid electrolyte contact. In this paper, we developed an operando TEM electrochemical liquid cell to meet this need, providing the configuration of a real battery and in a relevant liquid electrolyte. To demonstrate this novel technique, we studied the Lithiation/deLithiation behavior of single Si nanowires. Some of lithiatio...
Meng Gu - One of the best experts on this subject based on the ideXlab platform.
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Revealing the Chemical and Structural Evolution of V2O5 Nanoribbons in Lithium-Ion Batteries Using in Situ Transmission Electron Microscopy.
Analytical Chemistry, 2019Co-Authors: Huahai Shen, Xiangsheng Hu, Fei Yang, Weidong Zhou, Hui Yang, Meng GuAbstract:Layer-structured vanadium oxide (V2O5) nanoribbons with efficient electron transport and short lithium ion insertion lengths are promising candidates for high-performance lithium-ion battery applications. Despite the extensive investigation of its electrochemical properties, the chemical and structural evolution during Lithiation–deLithiation processes has rarely been characterized in real time. Herein, the Lithiation–deLithiation behaviors of V2O5 nanoribbons are probed by in situ transmission electron microscopy. We reveal that the V2O5 nanoribbons exhibit high Lithiation speed (0.8 nm/s) without retardation along the [010] direction and can be fully lithiated to the Li3V2O5 phase. Fully reversible retraction of lithium is observed in these V2O5 nanoribbons during deLithiation. The Lithiation process accompanying the coherent strain is further simulated by our phase field model. The simulation results reveal that the specific rough Lithiation interface between the V2O5 and Li3V2O5 phases originates from...
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demonstration of an electrochemical liquid cell for operando transmission electron microscopy observation of the Lithiation deLithiation behavior of si nanowire battery anodes
Nano Letters, 2013Co-Authors: Meng Gu, Lucas R Parent, Layla B Mehdi, Raymond R Unocic, Matthew T Mcdowell, Robert L Sacci, Wu Xu, Justin G Connell, Pinghong Xu, Patricia AbellanAbstract:Over the past few years, in situ transmission electron microscopy (TEM) studies of lithium ion batteries using an open-cell configuration have helped us to gain fundamental insights into the structural and chemical evolution of the electrode materials in real time. In the standard open-cell configuration, the electrolyte is either solid lithium oxide or an ionic liquid, which is point-contacted with the electrode. This cell design is inherently different from a real battery, where liquid electrolyte forms conformal contact with electrode materials. The knowledge learnt from open cells can deviate significantly from the real battery, calling for operando TEM technique with conformal liquid electrolyte contact. In this paper, we developed an operando TEM electrochemical liquid cell to meet this need, providing the configuration of a real battery and in a relevant liquid electrolyte. To demonstrate this novel technique, we studied the Lithiation/deLithiation behavior of single Si nanowires. Some of lithiatio...
Hui Yang - One of the best experts on this subject based on the ideXlab platform.
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Revealing the Chemical and Structural Evolution of V2O5 Nanoribbons in Lithium-Ion Batteries Using in Situ Transmission Electron Microscopy.
Analytical Chemistry, 2019Co-Authors: Huahai Shen, Xiangsheng Hu, Fei Yang, Weidong Zhou, Hui Yang, Meng GuAbstract:Layer-structured vanadium oxide (V2O5) nanoribbons with efficient electron transport and short lithium ion insertion lengths are promising candidates for high-performance lithium-ion battery applications. Despite the extensive investigation of its electrochemical properties, the chemical and structural evolution during Lithiation–deLithiation processes has rarely been characterized in real time. Herein, the Lithiation–deLithiation behaviors of V2O5 nanoribbons are probed by in situ transmission electron microscopy. We reveal that the V2O5 nanoribbons exhibit high Lithiation speed (0.8 nm/s) without retardation along the [010] direction and can be fully lithiated to the Li3V2O5 phase. Fully reversible retraction of lithium is observed in these V2O5 nanoribbons during deLithiation. The Lithiation process accompanying the coherent strain is further simulated by our phase field model. The simulation results reveal that the specific rough Lithiation interface between the V2O5 and Li3V2O5 phases originates from...
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Ultrahigh Malleability of the Lithiation-Induced LixSi Phase
ACS Applied Energy Materials, 2018Co-Authors: Xiaobo Shi, Jiakun Zhu, Yu Xia, Feifei Fan, Fucai Zhang, Hui YangAbstract:Through in situ transmission electron microscopy (TEM) observation, the Lithiation behaviors of carbon-coated silicon (Si) nanostructures are investigated. Our experimental results reveal that the carbon (C) coating can not only mediate the Lithiation kinetics and volume expansion, leading to the retardation or even complete suppression of the Lithiation process, but also determine the morphological evolution and final shape of the Lithiation products. The Lithiation behaviors of C-coated Si nanostructures are further corroborated by chemo-mechanical simulations. Our study consistently demonstrates that the effect of C coating layer on the Lithiation behaviors of Si nanostructures is closely related to the ultrahigh malleability and deformability of the Lithiation-induced LixSi phase. The finding of this study sheds light on the rational design of high-performance Si–C composite electrode materials.
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An atomistic perspective on Lithiation-induced stress in silicon nanopillars
Scripta Materialia, 2018Co-Authors: Feifei Fan, Hui Yang, Zhi ZengAbstract:Abstract We present reactive force field simulations that provide an atomistic understanding of Lithiation-induced stress generation in silicon nanopillars. We investigate two-phase Lithiation by developing a new protocol for simulation of formation and movement of an atomically sharp phase boundary. This protocol involves the layer-by-layer insertion of lithium atoms in the silicon lattice. The simulation results show the development of compressive stresses at the phase boundary and hoop tension near the surface of a Si nanopillar, thereby highlighting the atomistic underpinning of Lithiation-induced stress. The work enables a direct mapping between atomistic and continuum modeling of Lithiation-induced stress in large-volume-change electrodes.
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Strong kinetics-stress coupling in Lithiation of Si and Ge anodes
Extreme Mechanics Letters, 2015Co-Authors: Hui Yang, Chongmin Wang, Wentao Liang, Xu Guo, Sulin ZhangAbstract:Coupling between transport kinetics of chemical participants and mechanical stress is a universal phenomenon in numerous chemo-physical processes. In this Letter, we present a set of in-situ transmission electron microscopy studies along with atomistically informed continuum mechanics modeling to evidence the strong coupling between Lithiation kinetics and stress generation and failure of silicon (Si) and germanium (Ge) electrodes. On the one hand, we show that anisotropic Lithiation in crystalline Si (c-Si) leads to anisotropic swelling and surface fracture, in contrast to isotropic Lithiation, isotropic swelling, and tough behavior in c-Ge and amorphous Si (a-Si). On the other, we demonstrate that Lithiation self-generated stress leads to Lithiation retardation and externally applied bending breaking the Lithiation symmetry in c-Ge nanowires. Our studies shed lights on the design of durable high-performance lithium ion batteries.
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Bending-Induced Symmetry Breaking of Lithiation in Germanium Nanowires
Nano letters, 2014Co-Authors: Hui Yang, Daniel E. Perea, Ji Guang Zhang, Sulin Zhang, Chongmin WangAbstract:From signal transduction of living cells to oxidation and corrosion of metals, mechanical stress intimately couples with chemical reactions, regulating these biological and physiochemical processes. The coupled effect is particularly evident in the electrochemical Lithiation/deLithiation cycling of high-capacity electrodes, such as silicon (Si), where on the one hand Lithiation-generated stress mediates Lithiation kinetics and on the other the electrochemical reaction rate regulates stress generation and mechanical failure of the electrodes. Here we report for the first time the evidence on the controlled Lithiation in germanium nanowires (GeNWs) through external bending. Contrary to the symmetric core–shell Lithiation in free-standing GeNWs, we show bending the GeNWs breaks the Lithiation symmetry, speeding up lithaition at the tensile side while slowing down at the compressive side of the GeNWs. The bending-induced symmetry breaking of Lithiation in GeNWs is further corroborated by chemomechanical model...
Reza S. Yassar - One of the best experts on this subject based on the ideXlab platform.
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In situ electrochemical Lithiation/deLithiation observation of individual amorphous Si nanorods
ACS nano, 2011Co-Authors: Hessam Ghassemi, Ning Chen, Patricia A. Heiden, Reza S. YassarAbstract:In situ electrochemical Lithiation and deLithiation processes inside a nanobattery consisting of an individual amorphous Si nanorod and ionic liquid were explored. Direct formation of the crystalline Li22Si5 phase due to the intercalation of Li ions was observed. In addition, the role of the electrolyte–nanorod interface was examined. It was observed that the Lithiation of Si nanorods is dominated by surface diffusion. Upon the deLithiation process, partial decomposition of Li22Si5 particles was observed which can explain the irreversible capacity loss that is generally seen in Si anodes. This study shows that the radial straining due to Lithiation does not cause cracking in nanorods as small in diameter as 26 nm, whereas cracks were observed during the Lithiation of 55 nm Si nanorods.
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in situ electrochemical Lithiation deLithiation observation of individual amorphous si nanorods
ACS Nano, 2011Co-Authors: Hessam Ghassemi, Ning Chen, Patricia A. Heiden, Reza S. YassarAbstract:In situ electrochemical Lithiation and deLithiation processes inside a nanobattery consisting of an individual amorphous Si nanorod and ionic liquid were explored. Direct formation of the crystalline Li22Si5 phase due to the intercalation of Li ions was observed. In addition, the role of the electrolyte–nanorod interface was examined. It was observed that the Lithiation of Si nanorods is dominated by surface diffusion. Upon the deLithiation process, partial decomposition of Li22Si5 particles was observed which can explain the irreversible capacity loss that is generally seen in Si anodes. This study shows that the radial straining due to Lithiation does not cause cracking in nanorods as small in diameter as 26 nm, whereas cracks were observed during the Lithiation of 55 nm Si nanorods.
Patricia Abellan - One of the best experts on this subject based on the ideXlab platform.
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demonstration of an electrochemical liquid cell for operando transmission electron microscopy observation of the Lithiation deLithiation behavior of si nanowire battery anodes
Nano Letters, 2013Co-Authors: Meng Gu, Lucas R Parent, Layla B Mehdi, Raymond R Unocic, Matthew T Mcdowell, Robert L Sacci, Wu Xu, Justin G Connell, Pinghong Xu, Patricia AbellanAbstract:Over the past few years, in situ transmission electron microscopy (TEM) studies of lithium ion batteries using an open-cell configuration have helped us to gain fundamental insights into the structural and chemical evolution of the electrode materials in real time. In the standard open-cell configuration, the electrolyte is either solid lithium oxide or an ionic liquid, which is point-contacted with the electrode. This cell design is inherently different from a real battery, where liquid electrolyte forms conformal contact with electrode materials. The knowledge learnt from open cells can deviate significantly from the real battery, calling for operando TEM technique with conformal liquid electrolyte contact. In this paper, we developed an operando TEM electrochemical liquid cell to meet this need, providing the configuration of a real battery and in a relevant liquid electrolyte. To demonstrate this novel technique, we studied the Lithiation/deLithiation behavior of single Si nanowires. Some of lithiatio...
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demonstration of an electrochemical liquid cell for operando transmission electron microscopy observation of the Lithiation deLithiation behavior of si nanowire battery anodes
Nano Letters, 2013Co-Authors: Lucas R Parent, Layla B Mehdi, Raymond R Unocic, Matthew T Mcdowell, Robert L Sacci, Justin G Connell, Patricia Abellan, Xilin Chen, Yaohui ZhangAbstract:Over the past few years, in situ transmission electron microscopy (TEM) studies of lithium ion batteries using an open-cell configuration have helped us to gain fundamental insights into the structural and chemical evolution of the electrode materials in real time. In the standard open-cell configuration, the electrolyte is either solid lithium oxide or an ionic liquid, which is point-contacted with the electrode. This cell design is inherently different from a real battery, where liquid electrolyte forms conformal contact with electrode materials. The knowledge learnt from open cells can deviate significantly from the real battery, calling for operando TEM technique with conformal liquid electrolyte contact. In this paper, we developed an operando TEM electrochemical liquid cell to meet this need, providing the configuration of a real battery and in a relevant liquid electrolyte. To demonstrate this novel technique, we studied the Lithiation/deLithiation behavior of single Si nanowires. Some of lithiatio...