首页|Loosely coordinating diluted highly concentrated electrolyte toward-60 ℃ Li metal batteries
Loosely coordinating diluted highly concentrated electrolyte toward-60 ℃ Li metal batteries
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Lithium metal batteries(LMBs)promise energy density over 400 Wh kg-1.However,they suffer severe electrochemical performance deterioration at sub-zero temperatures.Such failure behavior highly corre-lates to inferior lithium metal anode(LMA)compatibility and sluggish Li+desolvation.Here,we demon-strate that cyclopentylmethyl ether(CPME)based diluted high-concentration electrolyte(DHCE)enables-60 ℃ LMBs operation.By leveraging the loose coordination between Li+and CPME,such devel-oped electrolyte boosts the formation of ion clusters to derive anion-dominant interfacial chemistry for enhancing LMA compatibility and greatly accelerates Li+desolvation kinetics.The resulting electrolyte demonstrates high Coulombic efficiencies(CE),providing over 99.5％,99.1％,98.5％and 95％at 25,-20,-40,and-60 ℃,respectively.The assembled Li-S battery exhibits remarkable cyclic stability in-20,and-40 ℃ at 0.2 C charging and 0.5 C discharging.Even at-60 ℃,Li-S cell with this designed electrolyte retains＞70％of the initial capacity over 170 cycles.Besides,lithium metal coin cell and pouch cell with 10 mg cm-2 high S cathode loading exhibit cycling stability at-20 ℃.This work offers an opportunity for rational designing electrolytes toward low temperature LMBs.
Lithium metal batteries-60 ℃ operationLithium metal anode compatibilityLi+ desolvation kinetics
Han Zhang、Ziqi Zeng、Qiang Wu、Xinlan Wang、Mingsheng Qin、Sheng Lei、Shijie Cheng、Jia Xie
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State Key Laboratory of Advanced Electromagnetic Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei China
State Key Laboratory of Materials Processing and Die & Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China
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