Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 15, Issue 1, Pages 1247-1255Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c18918
Keywords
lithium-ion batteries; high-energy laser; high-voltage spinel cathode; electrode-electrolyte interphases; chemical crossover
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The cycling stability of high-voltage spinel LiNi0.5Mn1.5O4 (LNMO) can be effectively enhanced by a high-energy laser treatment, which involves partial decomposition of the binder and formation of a surface LiF phase. This treatment mitigates detrimental electrode-electrolyte reactions and reduces the generation of dissolved transition-metal ions and acidic crossover species.
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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