Air-Stable and Dendrite-Free Lithium Metal Anodes Enabled by a Hybrid Interphase of C60 and Mg

作者：Xu, Qingshuai; Lin, Jiajin; Ye, Changchun; Jin, Xiaojing; Ye, Daiqi; Lu, Yingying; Zhou, Guangmin^*; Qiu, Yongcai^*; Li, Weishan^*

来源：Advanced Energy Materials, 2020, 10(6): 1903292.

DOI：10.1002/aenm.201903292

• fullerene
• hybrid interphase
• lithium dendrite suppression
• lithium metal batteries
• magnesium
• moisture resistance

Li metal is an ideal anode material for rechargeable high energy density batteries, but its sensitivity to humid air and uncontrolled dendrite growth limit its practical applications. A novel hybrid interphase is fabricated to address these issues. This interphase consists of dense fullerene (C-60) and magnesium metal bilayers, which are deposited successively on lithium foil by vacuum evaporation deposition and contribute to moisture resistance and lithium dendrite suppression. Thanks to this dual-functional feature, the assembled cells with the modified anodes and commercial LiFePO4 cathodes exhibit long cycle life (>200 cycles) with high capacity retention (>98.5%). Moreover, even the modified anodes that are exposed to humid air (30% relative humidity) for over 12 h; the cells still deliver excellent performance, comparable to those without exposure. Such a unique hybrid interphase provides a new promising method for fabricating air-stable and dendrite-free lithium metal batteries.

• 单位
  浙江大学; 清华大学