A uniform and conductive LiAlO coating on the LiNiCoMnO cathode material was successfully constructed by the synergistic effects of acid etching and polyvinylpyrrolidone (PVP) cross-linking approaches. Hydrolysis of Al sources (Al(NO)) generates H ions to etch the inert surfaces of hydroxide precursors, which leaves highly active sites exposed on the NiCoMn(OH) surfaces for subsequent coating. Furthermore, PVP polymeric chains act as cross-linkers to anchor Al(OH) onto the highly active NiCoMn(OH) surfaces for the formation of uniform LiAlO coating layers after chemical lithiation of calcination. The synergistically constructed LiAlO coating layers could effectively reduce the gas production and improve the cycling stability of the LiNiCoMnO cathode materials with a high reversible capacity of 212.0 mAh g at 0.1 C for the initial cycle and 172.3 mAh g at 1 C for the 200th cycle.

中文翻译：

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酸蚀和聚乙烯吡咯烷酮交联方法在LiNi0.8Co0.1Mn0.1O2正极材料上协同构建均匀的LiAlO2涂层用于高性能锂离子电池

通过酸蚀和聚乙烯吡咯烷酮（PVP）交联方法的协同作用，在LiNiCoMnO正极材料上成功构建了均匀导电的LiAlO涂层。 Al 源 (Al(NO)) 的水解产生 H 离子来蚀刻氢氧化物前体的惰性表面，从而在 NiCoMn(OH) 表面上留下暴露的高活性位点以供后续涂层使用。此外，PVP 聚合物链充当交联剂，将 Al(OH) 锚定在高活性 NiCoMn(OH) 表面上，以便在化学锂化和煅烧后形成均匀的 LiAlO 涂层。协同构建的LiAlO涂层可以有效减少气体产生并提高LiNiCoMnO正极材料的循环稳定性，其高可逆容量在0.1 C下首次循环为212.0 mAh g，在1 C下第200次循环为172.3 mAh g。