Non-flammable long chain phosphate ester based electrolyte via competitive solventized structures for high-performance lithium metal batteries  

作　　者：Li Liao Zhiqiang Han Xuanjie Feng Pan Luo Jialin Song Yin Shen Xiaoshuang Luo Xinpeng Li Xuanzhong Wen Bo Yu Junchen Chen Bingshu Guo Mingshan Wang Yun Huang Hongmei Zhang Mengmeng Yin Jiangtao Liu Yuanhua Lin Xing Li 

机构地区：[1]School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,Sichuan,China [2]State Key Laboratory of Advanced Chemical Power Sources,Guizhou Meiling Power Sources Co.Ltd,Zunyi 563003,Guizhou,China [3]Beijing Advanced Innovation Center for Materials Genome Engineering,Center for Green Innovation,School of Mathematics and Physics,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Journal of Energy Chemistry》2024年第10期156-165,I0004,共11页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China (grant No.52072322);the Department of Science and Technology of Sichuan Province (CN) (grant no.23GJHZ0147,23ZDYF0262,2022YFG0294);Research and Innovation Fund for Graduate Students of Southwest Petroleum University (No.:2022KYCX111)。

摘　　要：Safety remains a persistent challenge for high-energy-density lithium metal batteries(LMBs).The development of safe and non-flammable electrolytes is especially important in harsh conditions such as high temperatures.Herein,a flame-retardant,low-cost and thermally stable long chain phosphate ester based(tributyl phosphate,TBP)electrolyte is reported,which can effectively enhance the cycling stability of highly loaded high-nickel LMBs with high safety through co-solvation strategy.The interfacial compatibility between TBP and electrode is effectively improved using a short-chain ether(glycol dimethyl ether,DME),and a specially competitive solvation structure is further constructed using lithium borate difluorooxalate(LiDFOB)to form the stable and inorganic-rich electrode interphases.Benefiting from the presence of the cathode electrolyte interphase(CEI)and solid electrolyte interphase(SEI)enriched with LiF and Li_(x)PO_(y)F_(z),the electrolyte demonstrates excellent cycling stability assembled using a 50μm lithium foil anode in combination with a high loading NMC811(15.4 mg cm^(-2))cathode,with 88%capacity retention after 120 cycles.Furthermore,the electrolyte exhibits excellent high-temperature characteristics when used in a 1-Ah pouch cell(N/P=0.26),and higher thermal runaway temperature(238℃)in the ARC(accelerating rate calorimeter)demonstrating high safety.This novel electrolyte adopts long-chain phosphate as the main solvent for the first time,and would provide a new idea for the development of extremely high safety and high-temperature electrolytes.

关 键 词：Non-flammable electrolyte Long chain phosphate ester Solvation structure Lithium metal batteries Battery safety 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ265.1[化学工程—有机化工]