电解质
法拉第效率
锂(药物)
氧化物
化学工程
相间
石墨烯
金属
化学
铁电性
材料科学
剥离(纤维)
无机化学
纳米技术
复合材料
电极
有机化学
光电子学
物理化学
电介质
生物
工程类
遗传学
内分泌学
医学
作者
Baolei Xu,Chunxiao Zhang,Wenran Wang,Hai Zhu,Li Ma,Meiyu Wang,Chaoping Liang,Liangjun Zhou,Li Wang,Libao Chen,Douglas G. Ivey,Weifeng Wei
标识
DOI:10.1002/anie.202416565
摘要
Solid‐electrolyte interphase (SEI) plays a decisive role in building reliable Li metal batteries. However, the scarcity of anions in Helmholtz layer (HL) caused by electrostatic repulsion usually leads to the inferior SEI derived from solvents, resulting in dendrites and ‘dead’ Li. Therefore, regulating the distribution of anions in electric double layer (EDL) and continuously introducing more anions into HL to tailor anions‐derived SEI is crucial for achieving stable Li plating/stripping. Herein, by jointly utilizing the controlled defects of reduced graphene oxide (rGO) and the oriented dipoles of ferroelectric BaTiO3 (BTO), the rGO‐BTO composite layer sustainedly brings more TFSI‐ and NO3‐ into anion‐defecient HL, promoting favorable decomposition of anions and guiding the generation of robust and fast‐Li+‐transport SEI containing more inorganics LiF and Li3N species. Thus, the resulting Li deposit shows smooth and dense morphologies without dendrites, leading to high average Coulombic efficiency. The Li//Cu@rGO‐BTO (10 mAh cm‐2 plated Li) cell exhibits an enhanced Li plating/stripping stability (2700 h) and a higher rate capability. The LiFePO4 full cell (N/P=~6.3) using rGO‐BTO displays an enhanced capacity retention (82.0% @ 430 cycles). This work provides a new insight on the construction of robust SEI by regulating the distribution of anions within EDL.
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