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The Formation/Decomposition Equilibrium of LiH and its Contribution on Anode Failure in Practical Lithium Metal Batteries
Author(s) -
Xu Gaojie,
Li Jiedong,
Wang Chao,
Du Xiaofan,
Lu Di,
Xie Bin,
Wang Xiao,
Lu Chenglong,
Liu Haisheng,
Dong Shanmu,
Cui Guanglei,
Chen Liquan
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202013812
Subject(s) - anode , lithium (medication) , electrolyte , decomposition , oxide , metal , materials science , chemistry , analytical chemistry (journal) , inorganic chemistry , metallurgy , electrode , organic chemistry , medicine , endocrinology
Discovering the underlying reason for Li anode failure is a critical step towards applications of lithium metal batteries (LMBs). In this work, we conduct deuterium‐oxide (D 2 O) titration experiments in a novel on‐line gas analysis mass spectrometry (MS) system, to determine the content of metallic Li and lithium hydride (LiH) in cycled Li anodes disassembled from practical LiCoO 2 /Li LMBs. The practical cell is comprised of ultrathin Li anode (50 μm), high loading LiCoO 2 (17 mg cm −2 , 2.805 mAh cm −2 ) and different formulated electrolytes. Our results suggest that the amount of LiH accumulation is negatively correlated with cyclability of practical LMBs. More importantly, we reveal a temperature sensitive equilibrium (Li + 1/2 H 2 ⇌ LiH) governing formation and decomposition process of LiH at Li anode. We believe that the unusual understanding provided by this study will draw forth more insightful efforts to realize efficient Li protection and the ultimate applications of “holy grail” LMBs.