电解质
材料科学
锂(药物)
电化学
聚合物
电极
自行车
化学工程
金属锂
金属
电化学窗口
纳米技术
离子电导率
化学
复合材料
物理化学
考古
冶金
内分泌学
工程类
历史
医学
作者
Lingfei Tang,Bowen Chen,Zhonghan Zhang,Chang‐Qi Ma,Junchao Chen,Yage Huang,Fengrui Zhang,Qingyu Dong,Guoyong Xue,Daiqian Chen,Chenji Hu,Shuzhou Li,Zheng Liu,Yanbin Shen,Qi Chen,Liwei Chen
标识
DOI:10.1038/s41467-023-37997-6
摘要
Solid polymer electrolytes (SPEs), which are favorable to form intimate interfacial contacts with electrodes, are promising electrolyte of choice for long-cycling lithium metal batteries (LMBs). However, typical SPEs with easily oxidized oxygen-bearing polar groups exhibit narrow electrochemical stability window (ESW), making it impractical to increase specific capacity and energy density of SPE based LMBs with charging cut-off voltage of 4.5 V or higher. Here, we apply a polyfluorinated crosslinker to enhance oxidation resistance of SPEs. The crosslinked network facilitates transmission of the inductive electron-withdrawing effect of polyfluorinated segments. As a result, polyfluorinated crosslinked SPE exhibits a wide ESW, and the Li|SPE|LiNi0.5Co0.2Mn0.3O2 cell with a cutoff voltage of 4.5 V delivers a high discharge specific capacity of ~164.19 mAh g-1 at 0.5 C and capacity retention of ~90% after 200 cycles. This work opens a direction in developing SPEs for long-cycling high-voltage LMBs by using polyfluorinated crosslinking strategy.
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