Regulating dissolution chemistry of nitrates in carbonate electrolyte for high-stable lithium metal batteries  

作　　者：Yazhen Zhu Xiang Li Yubing Si Xiuqing Zhang Pengfei Sang Yongzhu Fu 

机构地区：[1]College of Chemistry,Zhengzhou University,Zhengzhou 450001,Henan,China

出　　处：《Journal of Energy Chemistry》2022年第10期422-428,I0011,共8页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(22005274 and 21975225);the Postdoctoral Science Foundation of China(2020M672261)。

摘　　要：Lithium metal batteries(LMBs)have received increasing attention due to the high energy density.However,the practical application of LMBs is limited due to the incompatibility of ester electrolytes.Transition metal(TM)nitrates have been reported as effective additives in ester electrolyte to improve the stability of lithium anode.Unfortunately,the nitrates are restricted to use due to their poor solubility.We find that the nitrates containing crystal water have high solubility in ester electrolytes.Considering that most TM nitrates contain crystal water and the crystal water can be used as a perfect solubilizer of nitrates,thus,the method is of universality and facile without introducing any solubilizing agent.Herein,In(NO_(3))_(3.6)H_(2)O is chosen as one typical case with increased solubility up to 0.2 M compared with In(NO_(3))_(3)which hardly dissolves in ester electrolyte.The additive promotes the rapid and stable formation of the solid electrolyte interface(SEI),which effectively inhibits the lithium dendrites formation.Moreover,the induced cathode electrolyte interface(CEI)maintains the structural stability of Li Ni_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811).As a result,the electrochemical performance of Li|NCM811 cell is obviously improved.Our study provides a new idea for dissolving nitrates in ester electrolytes and discloses the synergistic function of TM-ions.

关 键 词：Nitrates additive SOLUBILIZER Crystal water Stable SEI and CEI Lithium metal battery 

分 类 号：TM912[电气工程—电力电子与电力传动] O646[理学—物理化学]