As high capacity anode materials, spinel-type transition metal oxides have a bottleneck of poor cyclic stability. Nano structure and carbon loading are common modification approaches, while the high cost is unaffordable for industrial implementation. In this study, micron scale zinc manganate was synthesized by solvothermal plus calcination process. The pomegranate-shaped ZnMn₂O₄ (p-ZMO) was obtained using solvent of ethylene glycol, and the microsphere-shaped ZnMn₂O₄ (m-ZMO) was obtained using water. During electrochemical testing, the p-ZMO anode delivered larger charge capacity of 726 mAh g⁻¹ at 0.2 A g⁻¹ than 589 mAh g⁻¹ of m-ZMO. Even over 1000 cycles at 1 A g⁻¹, the p-ZMO still maintained a reversible capacity of 506 mAh g⁻¹ (much higher than 372 mAh g⁻¹ of graphite anode), with a superior retention of 84%. It indicates that this work develops an effective strategy to prepare high-performance transition metal oxides for anode materials of lithium-ion batteries.

作为高容量阳极材料，尖晶石型过渡金属氧化物具有循环稳定性差的瓶颈。纳米结构和碳载量是常见的改性方法，而高成本对于工业实施而言是无法承受的。在这项研究中，通过溶剂热加煅烧工艺合成了微米级的锰酸锌。使用乙二醇的溶剂得到石榴形的ZnMn ₂ O ₄（p-ZMO），用水得到的微球状的ZnMn ₂ O ₄（m-ZMO）。在电化学测试期间，与589 mAh g ^-1相比，p-ZMO阳极在0.2 A g ^-1下提供了726 mAh g ^-1更大的充电容量的ZMO。即使在1 A g ^-1下超过1000次循环，p-ZMO仍可保持506 mAh g ^-1的可逆容量（远远高于石墨阳极的372 mAh g ^-1），且保留率高达84％。这表明这项工作制定了一种有效的策略，以制备用于锂离子电池负极材料的高性能过渡金属氧化物。