材料科学
电解质
聚偏氟乙烯
阴极
锂(药物)
尖晶石
阳极
化学工程
电极
氟化锂
无机化学
复合材料
冶金
化学
物理化学
聚合物
内分泌学
工程类
医学
作者
Zehao Cui,Nayna Khosla,Tianxing Lai,J. Narayan,Arumugam Manthiram
标识
DOI:10.1021/acsami.2c18918
摘要
High-voltage spinel LiNi0.5Mn1.5O4 (LNMO) is a promising next-generation cathode material due to its structural stability, high operation voltage, and low cost. However, the cycle life of LNMO cells is compromised by detrimental electrode-electrolyte reactions, chemical crossover, and rapid anode degradation. Here, we demonstrate that the cycling stability of LNMO can be effectively enhanced by a high-energy laser treatment. Advanced characterizations unveil that the laser treatment induces partial decomposition of the polyvinylidene fluoride binder and formation of a surface LiF phase, which mitigates electrode-electrolyte side reactions and reduces the generation of dissolved transition-metal ions and acidic crossover species. As a result, the solid electrolyte interphase of the graphite counter electrode is thin and is composed of fewer electrolyte decomposition products. This work demonstrates the potential of laser treatment in tuning the surface chemistry of cathode materials for lithium-ion batteries.
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