以氯化钴溶液和硫酸铝溶液组成的双金属盐为原料，碳酸氢铵溶液为沉淀剂，采用共沉淀法制备掺铝均匀的四氧化三钴。将不同掺铝量的四氧化三钴和碳酸锂混匀、煅烧，得到Al-Li_2CoO₂。研究不同掺铝量的四氧化三钴对电池循环性能的影响。X射线衍射(XRD)、扫描电子显微镜(SEM)和电子探针X射线显微分析(EPMA)结果表明：掺铝量为0.6%(质量分数)的四氧化三钴铝分布最为均匀，且剖面一次颗粒细小，无铝片状富集的现象，结晶度最好。电化学测试表明：掺铝均匀的四氧化三钴能改善正极材料的倍率性能，提高材料的放电效率。其中掺铝量为0.6%的钴酸锂具有优异的循环寿命，1 C下的首次放电容量为173.2 mAh/g,100次充放电后放电容量仍为171.7 mAh/g，容量保持率为92%，明显优于其他掺铝量的正极材料。

Bimetallic raw materials composed of cobalt chloride solution and aluminum sulfate solution, ammonium bicarbonate solution as the precipitating agent, Al-doped Co_3O₄ was prepared for the co-precipitation method, and the Co_3O₄ about different aluminum doping and Li₂ CO₃ mixed evenly with Li₂ CO₃ and calcined to prepare for Al-Li₂ CoO₂. The study investigated the effect of the uniformity of Co_3O₄ doped with different aluminum contents on the battery cycling performance. XRD, SEM, and EPMA of tests showed that doped of 0.6% aluminum Co_3O₄ had the most uniform aluminum distribution, with fine primary particles in the cross-section, no aluminum flake enrichment, and the best crystallinity. Electrochemical tests indicated that Co_3O₄ doped of uniform aluminum improved the rate performance of the cathode material and enhanced its discharge efficiency. lithium cobaltate prepared with 0.6% aluminum doping exhibited the best cycling times, with a first discharge capacity of 173.2 mAh/g at 1 C, and the discharge capacity remained at 171.7 mAh/g after 100 cycles, with a capacity retention rate of 92%, significantly superior to cathode materials with different doping levels.