Combination of poly(vinylidene fluoride) (PVDF) with Ni‐rich layered cathode material create artificial cathode‐electrolyte interphases by thermal decomposition of PVDF and residual Li⁺ species. The pressure of the cell cycled with PVDF‐treated cathode materials is markedly decreased, since the thermal treatment with PVDF selectively reduces the amounts of Li⁺ species. The cycling performance is improved compared to nontreated Ni‐rich layered cathodes because the artificial cathode–electrolyte interphases effectively suppress the electrolyte decomposition as determined by systematic characterization of particle hardness, surface morphology, and electrochemical impedance spectroscopy. Additional high temperature storage tests performed with 3450‐dimensioned pouch cells indicate much improved recovery rates, as well as smaller open circuit voltage drops, smaller increases in internal resistance, and less swelling for cells cycled with the PVDF‐treated Ni‐rich layered cathode than with a nontreated Ni‐rich layered cathode.

中文翻译：

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通过对锂离子电池的聚偏二氟乙烯进行热处理的表面改性的富镍层状氧化物阴极

聚偏二氟乙烯（PVDF）与富镍层状阴极材料的结合通过PVDF和残留的Li ⁺物种的热分解产生了人工阴极-电解质中间相。用PVDF处理的正极材料循环的电池压力明显降低，因为用PVDF进行的热处理选择性地减少了Li ⁺的含量种类。与未经处理的富镍层状阴极相比，循环性能得到了改善，因为人工阴极-电解质中间相有效抑制了电解质的分解，这是由颗粒硬度，表面形态和电化学阻抗谱的系统表征确定的。使用3450尺寸的袋式电池进行的其他高温存储测试表明，与使用PVDF处理的富镍层状阴极循环的电池相比，回收率大大提高，开路电压降更小，内阻增加较小，溶胀较小。与未经处理的富镍层状阴极。