Qingfei Hao, Jiawei Yan, Ying Gao, Fei Chen, Xiangtao Chen, Yang Qi, Na Li
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引用次数: 0
摘要
碳酸盐基电解质在高电压阴极中显示出明显的优势,但在锂金属电池中会产生不均匀且机械脆弱的固电解质相(SEI)。在本文中,我们提出了一种富含 LiF 的 SEI,其中包含一种原位聚合聚(六亚甲基二异氰酸酯)基凝胶聚合物电解质(GPE),以提高 SEI 的均匀性和机械稳定性。碳酸氟乙烯酯(FEC)作为一种氟基添加剂,用于在锂金属电极上构建富含 LiF 的 SEI。采用这种策略,组装好的锂对称电池可稳定循环 700 小时,并显著抑制了锂电极表面副产物的形成。以高压 LiNi0.8Co0.1Mn0.1O2(NCM811)为正极,Li/GPE-FEC/NCM811 电池在 0.5 C 下循环 300 次后,放电容量达到 168.9 mAh g-1,容量保持率为 82%。
In Situ Formed Gel Polymer Electrolytes Enable Stable Solid Electrolyte Interface for High-Performance Lithium Metal Batteries.
Carbonate-based electrolytes show distinct advantages in high-voltage cathodes but generate nonuniform and mechanically fragile solid-electrolyte interphase (SEI) in lithium (Li) metal batteries. Herein, we propose a LiF-rich SEI incorporating an in situ polymerized poly(hexamethylene diisocyanate)-based gel polymer electrolyte (GPE) to improve the homogeneity and mechanical stability of SEI. Fluoroethylene carbonate (FEC) as a fluorine-based additive for building LiF-rich SEI on Li metal electrodes. With this strategy, the assembled Li symmetric batteries cycled stably for 700 h, and the formation of byproducts on the Li electrode surface was significantly inhibited. The Li/LiFePO4 battery delivered significant capacity retention (91% retention after 800 cycles) at 1 C. With high-voltage LiNi0.8Co0.1Mn0.1O2 (NCM811) as cathode, the Li/GPE-FEC/NCM811 cell delivered a discharge capacity of 168.9 mAh g-1 with a capacity retention of 82% after 300 cycles at 0.5 C. From the above, the work could assist the rapid development of high-energy-density rechargeable Li metal batteries toward remarkable performance.
期刊介绍:
ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.