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The effect of volume change and stack pressure on solid-state battery cathodes

SusMat 2023年第5期3卷 721-728页

作者： Boyang Liu Shengda DPu Christopher Doerrer Dominic Spencer Jolly Robert A.House Dominic L.R.Melvin Paul Adamson Patrick S.Grant Xiangwen Gao Peter G.Bruce Department of Materials University of OxfordOxfordUK The Faraday Institution DidcotUK The Henry Royce Institute University of OxfordOxfordUK Future Battery Research Center Global Institute of Future TechnologyShanghai Jiao Tong UniversityShanghaiChina Department of Chemistry University of OxfordOxfordUK

Solid-state lithium batteries may provide increased energy density and improved safety compared with Li-ion ***,in a solid-state composite cathode,mechanical degradation due to repeated cathode volume changes during cycling may occur,whichmay be partially mitigated by applying a significant,but often impractical,uniaxial stack ***,we compare the behavior of composite electrodes based on Li4Ti5O12(LTO)(negligible volume change)and Nb2O5(+4%expansion)cycled at different stack *** initial LTO capacity and retention are not affected by pressure but for Nb2O5,they are significantly lower when a stack pressure ofstack pressures for long-term cyclability for solid-state *** suggests that low volumechange cathode materials or a proper buffer layer are required for solid-state batteries,especially at low stack pressures.

关键词： cathode interface mechanical degradation stack pressure solid-state battery

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Fabrication pressures and stack pressures in solid-state battery

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eScience 2024年第4期4卷 27-40页

作者： Zhijun Wu Shengnan He Chao Zheng Jiantuo Gan Liaona She Mingchang Zhang Yong Gao Yaxiong Yang Hongge Pan Institute of Science and Technology for New Energy Xi'an Technological UniversityXi'an 710021China State Key Laboratory of Silicon Materials and School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China

Solid-state batteries(SSBs)have received widespread attention with their high safety and high energy density ***,solid-solid contacts in the internal electrode material and the electrode material/solid electrolyte(SE)interfaces,as well as the severe electrochemo-mechanical effects caused by the internal stress due to the volume change of the active material,these problems hinder ion/electron transport within the SSBs,which significantly deteriorates the electrochemical *** fabrication pressures and stack pressures are effective measures to improve solid-solid contact and solve electrochemo-mechanical ***,the influences of different pressures on cathode material,anode material,SEs,and electrode/SEs interface are briefly summarized from the perspective of interface ion diffusion,transmission of electrons and ions in internal particles,current density and ion diffusion kinetics,and the volume changes of Li^(+) stripping/plating based on two physical contact models,and point out the direction for the future research direction of SSBs and advancing industrialization by building the relationship between pressures and SSBs electrochemistry.

关键词： Fabrication pressure stack pressure Solid-state battery Solid electrolyte Ion/electron transport

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