通过锂铝合金化介质引导均匀锂电镀/剥离以实现长寿命锂金属电池
Guiding Uniform Li Plating/Stripping through Lithium-Aluminum Alloying Medium for Long-Life Li Metal Batteries.
作者信息
Ye Huan, Zheng Zi-Jian, Yao Hu-Rong, Liu Shun-Chang, Zuo Tong-Tong, Wu Xiong-Wei, Yin Ya-Xia, Li Nian-Wu, Gu Jiang-Jiang, Cao Fei-Fei, Guo Yu-Guo
机构信息
CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular Sciences, Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, 100190, P. R. China.
Huazhong Agricultural University, Wuhan, 430070, P. R. China.
出版信息
Angew Chem Int Ed Engl. 2019 Jan 21;58(4):1094-1099. doi: 10.1002/anie.201811955. Epub 2018 Dec 20.
The uncontrolled growth of Li dendrites upon cycling might result in low coulombic efficiency and severe safety hazards. Herein, a lithiophilic binary lithium-aluminum alloy layer, which was generated through an in situ electrochemical process, was utilized to guide the uniform metallic Li nucleation and growth, free from the formation of dendrites. Moreover, the formed LiAl alloy layer can function as a Li reservoir to compensate the irreversible Li loss, enabling long-term stability. The protected Li electrode shows superior cycling over 1700 h in a Li|Li symmetric cell.
循环过程中锂枝晶的无控制生长可能导致低库仑效率和严重的安全隐患。在此，通过原位电化学过程生成的亲锂二元锂铝合金层被用于引导均匀的金属锂成核和生长，避免枝晶的形成。此外，形成的锂铝合金层可以作为锂库来补偿不可逆的锂损失，实现长期稳定性。在锂对称电池中，受保护的锂电极在超过1700小时的循环中表现出优异的性能。
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