Deciphering the dual functions of a silicon dioxide protective layer in regulating lithium-ion deposition. Issue 12 (25th May 2022)

• Record Type: Journal Article
• Authors: Wu, Tianlai; Zhang, Weicai; Cai, Jiawen; Zheng, Mingtao; Hu, Hang; Yu, Xiaoyuan; Shao, Dan; Xiao, Yong; Liu, Yingliang; Liang, Yeru
• Is Part Of: Materials advances. Volume 3:Issue 12(2022)
• Page Start: 4797
• Page End: 4801
• Publication Date: 2022-05-25
• Subjects: 620.11
• DOI: 10.1039/d2ma00201a
• Languages: English
• ISSNs: 2633-5409

Abstract

Abstract : A systematic insight into the role of SiO2 as a protective layer in realizing uniform Li-ion deposition is proposed. Abstract : Silicon dioxide (SiO2 ) is widely applied as a protective layer of lithium (Li) metal, as it can suppress the growth of Li dendrites and prolong cycling life. However, fundamental understanding of how the SiO2 protective layer affects Li-ion deposition behavior is still limited. Such knowledge would be very desirable for the practical use of Li metal. Herein, a systematic study investigating the role of SiO2 as a protective layer for realizing uniform Li-ion deposition is described. Based on the successful construction of model materials, it was found that the SiO2 protective layer offers dual functions in improving Li deposition behaviors. The SiO2 protective layer can assist in the rapid transfer of Li ions from the electrolyte to the Li metal surface, while SiO2 near the Li metal surface can be used as lithiophilic sites to guide Li nucleation. Consequently, Li metal protected by SiO2 favors homogeneous Li nucleation/growth and successfully inhibits the formation of dendrites during prolonged cycling. An impressive long cycling stability for over 400 h with a low potential hysteresis was obtained in a symmetrical cell with protected Li, and an extended cycling life was achieved for protected Li when coupled with LiNi0.5 Co0.2 Mn0.3 O2 cathode.