The interplay between (electro)chemical and (chemo)mechanical effects in the cycling performance of thiophosphate-based solid-state batteries
The interplay between (electro)chemical and (chemo)mechanical effects in the cycling performance of thiophosphate-based solid-state batteries
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硫代磷酸盐固态电池循环性能中（电）化学和（化学）机械效应之间的相互作用
DOI：
10.1088/2752-5724/ac3897
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
T. Brezesinski
中科院分区：
文献类型：
--
作者：
J. Teo;F. Strauss;F. Walther;Yuan Ma;S. Payandeh;T. Scherer;M. Bianchini;J. Janek;T. Brezesinski
固态电池（SSB）是电化学能量存储的一个有前途的下一步，但受到许多问题的困扰。在这项研究中，我们证明了机械降解的反复出现的问题，因为在层状富镍氧化物阴极材料的硫代磷酸盐基SSB的体积变化。具体来说，我们探讨了不同结晶度的超离子固体电解质（SE），即玻璃状1.5Li2S-0.5P2S5-LiI和argyrodite Li 6PS 5Cl，重点是它们如何影响NCM 622（60%Ni）或NCM 851005（85%Ni）的浆料浇铸阴极的循环性能。非原位和原位分析技术相结合的应用有助于揭示使用具有低杨氏模量的SE的益处。通过（电）化学和（化学）机械效应的协同相互作用，这项工作中采用的玻璃态SE能够实现坚固稳定的界面，使其与阴极材料紧密接触，同时减轻体积变化。我们的研究结果强调了考虑化学，电化学和机械性能的重要性，以实现在高负荷SSB的长期循环性能。
Solid-state batteries (SSBs) are a promising next step in electrochemical energy storage but are plagued by a number of problems. In this study, we demonstrate the recurring issue of mechanical degradation because of volume changes in layered Ni-rich oxide cathode materials in thiophosphate-based SSBs. Specifically, we explore superionic solid electrolytes (SEs) of different crystallinity, namely glassy 1.5Li2S-0.5P2S5-LiI and argyrodite Li6PS5Cl, with emphasis on how they affect the cyclability of slurry-cast cathodes with NCM622 (60% Ni) or NCM851005 (85% Ni). The application of a combination of ex situ and in situ analytical techniques helped to reveal the benefits of using a SE with a low Young’s modulus. Through a synergistic interplay of (electro)chemical and (chemo)mechanical effects, the glassy SE employed in this work was able to achieve robust and stable interfaces, enabling intimate contact with the cathode material while at the same time mitigating volume changes. Our results emphasize the importance of considering chemical, electrochemical, and mechanical properties to realize long-term cycling performance in high-loading SSBs.