插层(化学)
法拉第效率
石墨
电解质
溶剂
阴极
离子
材料科学
阳离子聚合
电池(电)
无机化学
化学工程
溶剂化
聚合物
高分子化学
化学
有机化学
物理化学
电极
复合材料
功率(物理)
工程类
物理
量子力学
作者
Hongzhu Jiang,Xiaoqi Han,Xiaofan Du,Zheng Chen,Chenglong Lu,Xintong Li,Huanrui Zhang,Jingwen Zhao,Pengxian Han,Guanglei Cui
标识
DOI:10.1002/adma.202108665
摘要
Graphitic carbon that allows reversible anion (de)intercalation is a promising cathode material for cost-efficient and high-voltage dual-ion batteries (DIBs). However, one notorious but overlooked issue is the incomplete interfacial anion desolvation, which not only reduces the oxidative stability of electrolytes, but also results in solvent co-intercalation into graphite layers. Here, an "anion-permselective" polymer electrolyte with abundant cationic quaternary ammonium motif is developed to weaken the PF6- -solvent interaction and thus facilitates PF6- desolvation. This strategy significantly inhibits solvent co-intercalation as well as enhances the oxidation resistance of electrolyte, ensuring the structural integrity of graphite. As a result, the as-assembled graphite||Li cell achieves a superior cyclability with an average Coulombic efficiency of 99.0% (vs 95.7% for baseline electrolyte) and 87.1% capacity retention after 2000 cycles even at a high cutoff potential of 5.4 V versus Li+ /Li. Besides, this polymer also forms a robust cathode electrolyte interface, working together to enable a long-life DIB. This strategy of tuning anion coordination environment provides a promising solution to regulate solvent co-intercalation chemistry for DIBs.
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