Sun Jinran, Yan Jitong, Li Fan, Li Jiedong, Ma Jun, Xu Gaojie, Han Pengxian, Hou Guangjin, Tang Yongfu, Dong Shanmu, Huang Jianyu, Cui Guanglei
Qingdao Industrial Energy Storage Research Institute, Qingdao New Energy Shandong Laboratory, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.
Department Hebei Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, 066004, China.
Adv Mater. 2024 Aug;36(33):e2405384. doi: 10.1002/adma.202405384. Epub 2024 Jun 27.
Lithium hydride (LiH) has been widely recognized as the critical component of the solid-electrolyte interphase (SEI) in Li batteries. Although the formation mechanism and structural model of LiH in SEI have been extensively reported, the role in electro-performance of LiH in SEI is still ambiguous and has proven challenging to explored due to the complicated structure SEI and the lack of advanced in situ experimental technology. In this study, the isotopic exchange experiments combined with isotopic tracer experiments is applied to solidly illustrate the superior conductivity and Li conduction behavior of the LiH in natural SEI. Importantly, in situ transmission electron microscopy analysis is utilized to visualize the self-electrochemical decomposition of LiH, which is significantly distinctive from LiF and LiO. The critical experimental evidence discovered by the work demonstrates ion transport behaviors of key components in the SEI, which is imperative for designing novel SEI and augurs a new area in optimizing the performance of lithium batteries.
氢化锂（LiH）已被广泛认为是锂电池中固体电解质界面（SEI）的关键成分。尽管关于SEI中LiH的形成机制和结构模型已有大量报道，但由于SEI结构复杂且缺乏先进的原位实验技术，LiH在SEI中的电性能作用仍不明确，且难以探究。在本研究中，将同位素交换实验与同位素示踪实验相结合，以确凿地说明天然SEI中LiH具有卓越的导电性和Li传导行为。重要的是，利用原位透射电子显微镜分析来观察LiH的自电化学分解，这与LiF和LiO有显著区别。该工作发现的关键实验证据证明了SEI中关键成分的离子传输行为，这对于设计新型SEI至关重要，并预示着在优化锂电池性能方面将开辟一个新领域。
