锂电池负极材料四氧化三钴的结构优化及其电化学性能研究

以异丙醇作为溶剂,通过溶剂热法在不同反应时间下制备了前驱体碳酸钴,再采用高温煅烧法制备了超细纳米/微米多孔四氧化三钴粉末,研究了反应时间对前驱体碳酸钴及四氧化三钴的组成及形貌的影响,并测定了四氧化三钴负极材料电化学性能。结果表明,纳米/微米球(2~4 μm)由细小且均匀的四氧化三钴纳米颗粒和孔洞组成;以四氧化三钴作为锂离子电池负极材料,在0.5和1 A/g电流密度下,循环450圈后比容量分别保持在680和473 mAh/g,显示出优异的电化学性能。

Structural Optimization and Electrochemical Properties of Co3O4 as Anode Materials for Lithium-Ion Batteries

With isopropanol as a solvent, the precursor of cobalt carbonate was prepared by adopting the solvothermal method with different reaction time, and ultrafine nano/micron-structure porous Co₃O₄ spheres were then prepared by adopting a calcination process. The effect of reaction time on the compositions and morphology of cobalt carbonate and Co₃O₄ was investigated and the electrochemical properties of Co₃O₄ as an anode material of Li-ion batteries were also tested. Results show that micron-sized spheres (2~4 μm) are composed of ultrafine and uniform nano-sized Co₃O₄ spheres and pores. Under the current densities of 0.5 and 1 A/g, the prepared Co₃O₄ anode material exhibits excellent electrochemical performance, with the specific capacities held at 680 and 473 mAh/g after 450 cycles.