Nano silica aerogel-induced formation of an organic/alloy biphasic interfacial layer enables construction of stable high-energy lithium metal batteries  

作　　者：Chengwei Ma Xinyu Zhang Chengcai Liu Yuanxing Zhang Yuanshen Wang Ling Liu Zhikun Zhao Borong Wu Daobin Mu 

机构地区：[1]Beijing Key Laboratory of Environmental Science and Engineering,School of Materials Science and Engineering,Beijing Institute of Technology,Beijing,100081,China [2]Collaborative Innovation Center of Electric Vehicles in Beijing,Beijing,100081,China

出　　处：《Green Energy & Environment》2023年第4期1071-1080,共10页绿色能源与环境（英文版）

基　　金：the support from National Natural Science Foundation of China (22179006);International Science & Technology Cooperation Program of China under Contract No.2019YFE0100200;National Natural Science Foundation of China (52072036);NSAF (No.U1930113);Guangdong Key Laboratory of Battery Safety,China (No.2019B121203008);China Postdoctoral Science Foundation (No.2021TQ0034)。

摘　　要：Lithium metal batteries represent promising candidates for high-energy-density batteries, however, many challenges must still be overcome,e.g., interface instability and dendrite growth. In this work, nano silica aerogel was employed to generate a hybrid film with high lithium ion conductivity(0.6 mS cm^(-1)at room temperature) via an in situ crosslinking reaction. TOF-SIMS profile analysis has revealed conversion mechanism of hybrid film to Li–Si alloy/Li F biphasic interface layer, suggesting that the Li–Si alloy and Li F-rich interface layer promoted rapid Li+transport and shielded the Li anodes from corrosive reactions with electrolyte-derived products. When coupled with nickel-cobalt-manganese-based cathodes, the batteries achieve outstanding capacity retention over 1000 cycles at 1 C. Additionally the developed film coated on Li enabled high coulombic efficiency(99.5%) after long-term cycling when coupled with S cathodes. Overall, the results presented herein confirm an effective strategy for the development of high-energy batteries.

关 键 词：Lithium metal batteries Nano silica aerogel In situ crosslinking Biphasic interface layer Li–Si alloy 

分 类 号：TM912[电气工程—电力电子与电力传动]