As nickel-rich cathodes materials begin to attract immense attentions for its ultra-high capacity for Li-ion batteries (LIBs), their cycling stability remains insufficient for electric vehicles. Surface coating is regarded as an efficient approach in the enhancement of Ni-rich cathodes. Unfortunately, surface modification of cathode via a simple and effective way is still great challenges. Here we report a facile one-step chemical approach using nanoscale polycrystalline of solid electrolyte Li_3.2Zr_0.4Si_0.6O_3.6 (NP-LZSO) to build a conductive protective coating on Ni-rich cathode LiNi_0.8Co_0.15Mn_0.05O₂ (NCM). The NP-LZSO coating layer facilitates the transportation of Li-ions, significantly suppresses the undesired side reactions in cycling process, and effectively stabilizes the electrolyte-NCM interface. This approach remarkably improves the cycling stability with a capacity retention rate of 79.9% over 400 cycles at 0.2C. This effective strategy provides a new insight using nanoscale polycrystalline of solid electrolyte to modify surface of nickel-rich cathodes to improve its cyclic performance.

随着富镍阴极材料因其超高容量的锂离子电池（LIB）而开始引起人们的广泛关注，其循环稳定性仍然不足以用于电动汽车。表面涂层被认为是增强富镍阴极的有效方法。不幸的是，通过简单有效的方法对阴极进行表面改性仍然是巨大的挑战。在这里，我们报告了一种使用固态电解质Li _3.2 Zr _0.4 Si _0.6 O _3.6（NP-LZSO）的纳米级多晶的简单的一步化学方法，以在富镍阴极LiNi _0.8 Co _0.15 Mn _0.05 O ₂上建立导电保护涂层（NCM）。NP-LZSO涂层促进了锂离子的运输，显着抑制了循环过程中不希望的副反应，并有效地稳定了电解质-NCM界面。这种方法显着提高了循环稳定性，在0.2C下400次循环中的容量保持率为79.9％。这种有效的策略为使用固态电解质的纳米级多晶修饰富镍阴极的表面以改善其循环性能提供了新的见解。