Bottom-up lithium growth guided by Ag concentration gradient in 3D PVDF framework towards stable lithium metal anode

• 作者: Yulin Zhao Liping Wang Jian Zou Qiwen Ran Li Li Pengyu Chen Hailong Yu Jian Gao Xiaobin Niu
• 来源期刊: 能源化学
• 年，卷（期）: 2022,（2）
• 页码范围: 666-673
• 页数: 8页
• 语种: 英文

摘要

Three-dimensional (3D) frameworks have received much attention as an effective modification strategy for next-generation high-energy-density lithium metal batteries.However,the top-growth mode of lithium (Li) on the 3D framework remains a tough challenge,To achieve a uniform bottom-up Li growth,a scheme involving Ag concentration gradient in 3D PVDF framework (C-Ag/PVDF) is proposed.Ag nanoparticles with a concentration gradient induce an interface activity gradient in the 3D framework,and this gradient feature is still maintained during the cycle.As a result,the C-Ag/PVDF framework deliv-ers a long lifespan over 1800 h at a current density of 1 mA cm-2 with a capacity of 1 mAh cm-2,and shows an ultra-long life (＞1300 h) even at a high current density of 4 mA cm-2 with a capacity of 4 mAh cm-2.The advantage of concentration gradient provides further insights into the optimal design of the 3D framework for stable Li metal anode.