SEI/dead Li-turning capacity loss for high-performance anode-free solid-state lithium batteries

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外文摘要：Anode-free solid-state lithium metal batteries(AF-SSLBs)have the potential to deliver higher energy den-sity and improved safety beyond lithium-metal batteries.However,the unclear mechanism for the fast capacity decay in AF-SSLBs,either determined by dead Li or solid electrolyte interface(SEI),limits the proposal of effective strategies to prolong cycling life.To clarify the underlying mechanism,herein,the evolution of SEI and dead Li is quantitatively analyzed by a solid-state nuclear magnetic resonance(ss-NMR)technology in a typical LiPF6-based polymer electrolyte.The results show that the initial capacity loss is attributed to the formation of SEI,while the dead Li dominates the following capacity loss and the growth rate is 0.141 mA h cm-2 cycle-1.To reduce the active Li loss,the combination of inorganic-rich SEI and self-healing electrostatic shield effect is proposed to improve the reversibility of Li deposition/disso-lution behavior,which reduces the capacity loss rate for the initial SEI and following dead Li generation by 2.3 and 20.1 folds,respectively.As a result,the initial Coulombic efficiency(ICE)and stable CE increase by 15.1％and 15.3％in Li-Cu cells,which guides the rational design of high-performance AF-SSLBs.

外文关键词：

Solid-state lithium batteriesSolid-state NMRAnode-freeSEIDead Li

作者：

Qianwen Yin、Tianyu Li、Hongzhang Zhang、Guiming Zhong、Xiaofei Yang、Xianfeng Li

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作者单位：

Division of Energy Storage,Dalian National Laboratory for Clean Energy,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China

University of Chinese Academy of Sciences,Beijing 100049,China

Key Laboratory of Long-Duration and Large-Scale Energy Storage,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China

Laboratory of Advanced Spectro-Electrochemistry and Lithium-Ion Batteries,Dalian National Laboratory for Clean Energy,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China

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基金：

CAS Project of Young Scientists in Basic ResearchNational Natural Science Foundation of ChinaOutstanding Youth Foundation of Liaoning ProvinceDalian Science and Technology Innovation FundEnergy Revolution S&T Program of Yulin Innovation Institute of Clean Energy

项目编号：

YSBR-058222791352023JH3/102000192023JJ11CG004YIICE E411010316

出版年：

2024

DOI：

10.1016/j.jechem.2024.04.033

能源化学

中国科学院大连化学物理研究所中国科学院成都有机化学研究所

能源化学

CSTPCDEI

影响因子：0.654

ISSN：2095-4956

年,卷(期)：2024.96(9)