Abstract A LiNi1/3Co1/3Mn1/3O2 (NCM111) cathode with B2O3 surface modification was prepared in a facial synthesis method using H3BO3 as a modifier precursor. Both TEM and XPS measurements demonstrate that a thin layer of amorphous B2O3 is successfully coated on the surface of 1B2O3@NCM111 particles. XRD, SEM and TEM testing results show that the morphology and lattice structure present little change after coating. The B2O3 surface modified 1B2O3@NCM111 shows 43% improved high-rate (at 5C rate) discharge performance and enhanced cycling stability (with about 92% and 86% capacity retention at 1C and 2C rates after 50 and 100 cycles measurements) compared to the pristine NCM111. EIS and GITT results also present that the 1B2O3@NCM111 electrode with B2O3 surface modification retains higher Li+ chemical diffusion coefficient than the pristine NCM111 even after 50 charge/discharge cycles at 1C rate.

中文翻译：

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表面B2O3表面改性对LiNi1/3Co1/3Mn1/3O2正极循环稳定性和高倍率容量影响的研究

摘要 以H3BO3为改性剂前体，采用面合成法制备了表面改性的LiNi1/3Co1/3Mn1/3O2（NCM111）正极。TEM 和 XPS 测量都表明，在 1B2O3@NCM111 颗粒的表面上成功涂覆了一层薄薄的无定形 B2O3。XRD、SEM和TEM测试结果表明涂层后形貌和晶格结构几乎没有变化。与 B2O3 表面改性的 1B2O3@NCM111 相比，高倍率（5C 倍率）放电性能提高了 43%，循环稳定性增强（1C 和 2C 倍率下的容量保持率在 50 和 100 次循环测量后分别保持了约 92% 和 86%）。原始的 NCM111。