A Co–Mn–O/C composite is obtained by incorporating two metal ions from Co(Ac)₂ and Mn(Ac)₂ into a mixed-metal–organic framework (MOF) followed by high-temperature carbonization in air. The Co–Mn–O/C composite has a unique hollow-sphere structure with the shells constructed with Co–Mn–O grains embedded in an amorphous carbon matrix, which combines the advantage of efficient strain absorption and high conductivity. As a modulator, acetic acid has a large influence on the particle size and surface area of the Co–Mn–O/C hollow spheres that further affect their electrical properties, and an optimum Co:Mn ratio can result in greatly enhanced electrochemical performances. More importantly, the metallic Co nanoparticles in the Co–Mn–O/C composite also have the impact on adjusting the solid electrolyte interphase (SEI) layer, which helps in maintaining high morphological integrity and considerable electrochemical performance. At an optimum Co:Mn ratio, the Co–Mn–O/C electrode produces outstanding performance in both cycle and rate tests. A high-rate capacity of 1088.5 mAh g⁻¹ is observed after 600 cycles at 1000 mA g⁻¹ and a capacity of 775.9 mAh g⁻¹ is reserved even after the current density rise to 8000 mA g⁻¹. The Co–Mn–O/C composite is expected to serve as a low-cost and high-performance anode for lithium-ion batteries.

Co-Mn-O/C 复合材料是通过将来自 Co(Ac) ₂和 Mn(Ac) _{2 的}两种金属离子结合到混合金属-有机骨架 (MOF) 中，然后在空气中高温碳化而获得的。Co-Mn-O/C 复合材料具有独特的空心球结构，其壳由嵌入无定形碳中的 Co-Mn-O 晶粒构成基体，它结合了高效应变吸收和高电导率的优点。作为调节剂，乙酸对 Co-Mn-O/C 空心球的粒径和表面积有很大影响，进一步影响其电性能，最佳 Co:Mn 比可以大大提高电化学性能。更重要的是，Co-Mn-O/C 复合材料中的金属 Co 纳米粒子也对调整固体电解质界面 (SEI) 层有影响，这有助于保持高的形态完整性和可观的电化学性能。在最佳 Co:Mn 比率下，Co-Mn-O/C 电极在循环和倍率测试中均表现出色。在 1000 mA g 下循环 600 次后观察到1088.5 mAh g ^{-1 的}高倍率容量^-1 和 775.9 mAh g ^-1的容量即使在电流密度上升到 8000 mA g ^-1之后仍然保留。Co-Mn-O/C 复合材料有望用作锂离子电池的低成本和高性能负极。