The electrochemical performances of LiNi_0.5Co_0.2Mn_0.3O₂ (NCM523) layered cathode material, such as poor rate capacity and cycling stability caused by undesirable intrinsic conductivity and low rate of lithium ion transportation, are not fairly good especially at elevated rate and cut-off voltage. To improve these properties, in this study, the co-coating layer of graphene and TiO₂ was constructed on NCM523 surface. The graphene/TiO₂ coating layer could effectively prevent hydrofluoric acid (HF) attacks, suppress the side reaction, accelerate the lithium ion diffusion and facilitate the electron migration. The enhancement of cycle performance and rate capacity was contributed to the uniform co-modified surface, interacting each other and thus exhibiting synergistic effects.

LiNi _0.5 Co _0.2 Mn _0.3 O ₂ (NCM523)层状正极材料的电化学性能，例如不良的本征电导率和锂离子传输率低导致的倍率容量和循环稳定性较差，尤其是在高倍率和切割率下- 关闭电压。为了改善这些性能，在本研究中，在 NCM523 表面构建了石墨烯和 TiO ₂的共涂层。石墨烯/TiO ₂涂层能有效防止氢氟酸（HF）的侵蚀，抑制副反应，加速锂离子扩散，促进电子迁移。循环性能和倍率容量的提高有助于均匀的共改性表面，彼此相互作用并因此表现出协同效应。