An ultrathin Li-doped perovskite SEI film with high Li ion flux for a fast charging lithium metal battery

• Published in: Energy advances 2024-12, Vol.3 (12), p.2999-36
• Main Authors: Liu, Ruliang, Feng, Wenli, Fang, Liangzhou, Deng, Huiping, Lin, Ling, Chen, MinChang, Zhong, Jun-Xing, Yin, Wei
• Format: Article
• Language: English
• ISSN: 2753-1457; 2753-1457
• DOI: 10.1039/d4ya00507d

Developing an artificial solid electrolyte interphase (SEI) with high Li ion flux is vital to improve the cycling stability of lithium metal batteries, especially under a high rate. In this work, a novel artificial SEI film was prepared via in situ deposition of a lithium-doped cesium lead chloride perovskite (Li-CsPbCl 3 ). Benefiting from its ultra-high thickness (0.45 μm), high mechanical modulus (5.9 GPa), high lithium-ion migration number (0.57), and unique highly oriented framework, the Li-CsPbCl 3 SEI film could promote the rapid transport and uniform deposition of lithium ions, enhancing the stability of lithium deposition and stripping. As a result, Li/Li symmetric cells based on the Li-CsPbCl 3 protective film could cycle stably for 1300 hours under high current density of 10 mA cm −2 . In addition, the Li/LiFePO 4 battery using the Li-CsPbCl 3 SEI film showed an impressive cycling stability with a capacity retention rate of up to 91.4% after 230 cycles at a high current rate of 3C. A novel artificial SEI film (Li-CsPbCl 3 ) based on lithium-doped cesium lead chloride perovskite enables fast charging lithium metal batteries by regulating the rapid transport and uniform deposition of lithium ions.