The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Gerbrand Ceder - One of the best experts on this subject based on the ideXlab platform.
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characterization of Mechanical Degradation in an all solid state battery cathode
Journal of Materials Chemistry, 2020Co-Authors: Yaqian Zhang, Qingsong Tu, Yuhao Wang, M C Scott, Gerbrand CederAbstract:Solid-state batteries (SSBs) are considered promising next-generation energy storage devices but tend to suffer from rapid capacity fade. Here, we demonstrate that Mechanical contact loss between the solid conductor and cathode, induced by its volume changes during cycling, plays a significant role in the observed capacity fade. Focused ion beam-scanning electron microscope (FIB-SEM) tomography with nanoscale resolution was used for 3D characterization of the composite electrode morphology before and after cycling. The tomography data demonstrates the development of voids and cracks near the cathode particles and significant contact loss between the cathode particles and solid electrolyte after cycling. The observed Mechanical Degradation in the electrode composite highlights the difficulty and importance of engineering Mechanically stable SSBs. The application of large external pressure after long-term cycling led to recovery of lost capacity and reduced the cell resistance, confirming the effect of Mechanical Degradation.
Yaqian Zhang - One of the best experts on this subject based on the ideXlab platform.
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characterization of Mechanical Degradation in an all solid state battery cathode
Journal of Materials Chemistry, 2020Co-Authors: Yaqian Zhang, Qingsong Tu, Yuhao Wang, M C Scott, Gerbrand CederAbstract:Solid-state batteries (SSBs) are considered promising next-generation energy storage devices but tend to suffer from rapid capacity fade. Here, we demonstrate that Mechanical contact loss between the solid conductor and cathode, induced by its volume changes during cycling, plays a significant role in the observed capacity fade. Focused ion beam-scanning electron microscope (FIB-SEM) tomography with nanoscale resolution was used for 3D characterization of the composite electrode morphology before and after cycling. The tomography data demonstrates the development of voids and cracks near the cathode particles and significant contact loss between the cathode particles and solid electrolyte after cycling. The observed Mechanical Degradation in the electrode composite highlights the difficulty and importance of engineering Mechanically stable SSBs. The application of large external pressure after long-term cycling led to recovery of lost capacity and reduced the cell resistance, confirming the effect of Mechanical Degradation.
W. Craig Carter - One of the best experts on this subject based on the ideXlab platform.
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Random Walk Analysis of the Effect of Mechanical Degradation on All-Solid-State Battery Power
Journal of The Electrochemical Society, 2017Co-Authors: Giovanna Bucci, Tushar Swamy, Yet-ming Chiang, W. Craig CarterAbstract:Mechanical and electrochemical phenomena are coupled in defining the battery reliability, particularly for solid-state batteries. Micro-cracks act as barriers to Li-ion diffusion in the electrolyte, increasing the average electrode’s tortuosity. In our previous work, we showed that solid electrolytes are likely to suffer from Mechanical Degradation if their fracture energy is lower than 4 J m− 2 [G. Bucci, T. Swamy, Y.-M. Chiang, and W. C. Carter, J. Mater. Chem. A (2017)]. Here we study the effect of electrolyte micro-cracking on the effective conductivity of composite electrodes. Via random analyzes, we predict the average diffusivity of lithium in a solid-state electrode to decrease linearly with the extension of Mechanical Degradation. Furthermore, the statistical distribution of first passage times indicates that the microstructure becomes more and more heterogeneous as damage progresses. In addition to power and capacity loss, a non-uniform increase of the electrode tortuosity can lead to heterogeneous lithiation and further stress localization. The understanding of these phenomena at the mesoscale is essential to the implementation of safe high-energy solid-state batteries.
M C Scott - One of the best experts on this subject based on the ideXlab platform.
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characterization of Mechanical Degradation in an all solid state battery cathode
Journal of Materials Chemistry, 2020Co-Authors: Yaqian Zhang, Qingsong Tu, Yuhao Wang, M C Scott, Gerbrand CederAbstract:Solid-state batteries (SSBs) are considered promising next-generation energy storage devices but tend to suffer from rapid capacity fade. Here, we demonstrate that Mechanical contact loss between the solid conductor and cathode, induced by its volume changes during cycling, plays a significant role in the observed capacity fade. Focused ion beam-scanning electron microscope (FIB-SEM) tomography with nanoscale resolution was used for 3D characterization of the composite electrode morphology before and after cycling. The tomography data demonstrates the development of voids and cracks near the cathode particles and significant contact loss between the cathode particles and solid electrolyte after cycling. The observed Mechanical Degradation in the electrode composite highlights the difficulty and importance of engineering Mechanically stable SSBs. The application of large external pressure after long-term cycling led to recovery of lost capacity and reduced the cell resistance, confirming the effect of Mechanical Degradation.
Giovanna Bucci - One of the best experts on this subject based on the ideXlab platform.
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Random Walk Analysis of the Effect of Mechanical Degradation on All-Solid-State Battery Power
Journal of The Electrochemical Society, 2017Co-Authors: Giovanna Bucci, Tushar Swamy, Yet-ming Chiang, W. Craig CarterAbstract:Mechanical and electrochemical phenomena are coupled in defining the battery reliability, particularly for solid-state batteries. Micro-cracks act as barriers to Li-ion diffusion in the electrolyte, increasing the average electrode’s tortuosity. In our previous work, we showed that solid electrolytes are likely to suffer from Mechanical Degradation if their fracture energy is lower than 4 J m− 2 [G. Bucci, T. Swamy, Y.-M. Chiang, and W. C. Carter, J. Mater. Chem. A (2017)]. Here we study the effect of electrolyte micro-cracking on the effective conductivity of composite electrodes. Via random analyzes, we predict the average diffusivity of lithium in a solid-state electrode to decrease linearly with the extension of Mechanical Degradation. Furthermore, the statistical distribution of first passage times indicates that the microstructure becomes more and more heterogeneous as damage progresses. In addition to power and capacity loss, a non-uniform increase of the electrode tortuosity can lead to heterogeneous lithiation and further stress localization. The understanding of these phenomena at the mesoscale is essential to the implementation of safe high-energy solid-state batteries.