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Effective transport network driven by tortuosity gradient enables high-electrochem-active solid-state batteries.


ABSTRACT: Simultaneously achieving high electrochemical activity and high loading for solid-state batteries has been hindered by slow ion transport within solid electrodes, in particular with an increase in electrode thickness. Ion transport governed by 'point-to-point' diffusion inside a solid-state electrode is challenging, but still remains elusive. Herein, synchronized electrochemical analysis using X-ray tomography and ptychography reveals new insights into the nature of slow ion transport in solid-state electrodes. Thickness-dependent delithiation kinetics are spatially probed to identify that low-delithiation kinetics originate from the high tortuous and slow longitudinal transport pathways. By fabricating a tortuosity-gradient electrode to create an effective ion-percolation network, the tortuosity-gradient electrode architecture promotes fast charge transport, migrates the heterogeneous solid-state reaction, enhances electrochemical activity and extends cycle life in thick solid-state electrodes. These findings establish effective transport pathways as key design principles for realizing the promise of solid-state high-loading cathodes.

SUBMITTER: Liu QS 

PROVIDER: S-EPMC9977374 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature

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Effective transport network driven by tortuosity gradient enables high-electrochem-active solid-state batteries.

Liu Qing-Song QS   An Han-Wen HW   Wang Xu-Feng XF   Kong Fan-Peng FP   Sun Ye-Cai YC   Gong Yu-Xin YX   Lou Shuai-Feng SF   Shi Yi-Fan YF   Sun Nan N   Deng Biao B   Wang Jian J   Wang Jia-Jun JJ  

National science review 20221128 3


Simultaneously achieving high electrochemical activity and high loading for solid-state batteries has been hindered by slow ion transport within solid electrodes, in particular with an increase in electrode thickness. Ion transport governed by 'point-to-point' diffusion inside a solid-state electrode is challenging, but still remains elusive. Herein, synchronized electrochemical analysis using X-ray tomography and ptychography reveals new insights into the nature of slow ion transport in solid-s  ...[more]

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