The development of lithium-ion batteries is hindered by the lack of appropriate low-cost cathode materials with high performance. Here, the preparation of Cu-coated Li₃V₂(PO₄)₃/C (x% Cu-LVPC) composites is reported via a chemical precipitation and self-reduction method. With an optimized Cu coating content of 2.0 wt%, the 2.0% Cu-LVPC composite displays the best electrochemical properties. The initial discharge capacity of 2.0% Cu-LVPC is 175 mA h g⁻¹ at 0.15 C (30 mA g⁻¹) in the voltage range from 3.0 to 4.8 V and the capacity retention is 86.3% after 50 cycles, whereas pristine LVPC has an initial capacity of 163 mA h g⁻¹ and retains 82.2% of the capacity after 50 cycles. Moreover, the rate capacity of 2.0% Cu-LVPC is also increased under different current densities and 2.0% Cu-LVPC exhibits excellent long-term cycling performance of 89 mA h g⁻¹ after 1000 cycles at 10 C. The enhanced electrochemical properties are attributed to the uniform coating of the metal conductor Cu on the LVPC surface, which is conducive to electron transfer and extraction/insertion of Li⁺ ions.

缺乏合适的低成本高性能正极材料阻碍了锂离子电池的发展。在此，报道了通过化学沉淀和自还原方法制备 Cu 包覆的 Li ₃ V ₂ (PO ₄ ) ₃ /C ( x % Cu-LVPC) 复合材料。优化的 Cu 涂层含量为 2.0 wt%，2.0% Cu-LVPC 复合材料显示出最佳的电化学性能。在 3.0 至 4.8 V 的电压范围内，2.0% Cu-LVPC 的初始放电容量为 175 mA hg ^-1在 0.15 C (30 mA g ^-1 ) 和 50 次循环后容量保持率为 86.3%，而原始 LVPC 具有163 mA hg ^-1的初始容量并在 50 次循环后保留 82.2% 的容量。此外，2.0% Cu-LVPC 在不同电流密度下的倍率容量也有所提高，2.0% Cu-LVPC在 10 C 下循环 1000 次后表现出 89 mA hg ^{-1 的}优异长期循环性能。增强的电化学性能归因于LVPC表面金属导体Cu的均匀包覆，有利于电子转移和Li ⁺离子的提取/插入。