摘要
介绍了一种用溶胶-凝胶法制备包覆LiCoO2的LiMn2O4的方法。以乙二醇为螯合剂,将商业化的LiMn2O4加入到醋酸钴和醋酸锂的混合溶液中,调节pH值,在水浴中搅拌后离心分离,并在高温条件下煅烧即得到产品。利用X-射线衍射、差热—热重分析、透射电子显微镜以及充放电性能测试等分析方法来考察包覆LiCoO2的质量、煅烧温度和煅烧时间对晶体结构和电化学性能的影响。通过电化学性能测试表明,在最佳工艺条件下制备的LiCoO2包覆LiMn2O4材料的电化学比容量(115mAh/g)明显高于未包覆的LiMn2O4材料(110mAh/g),充放电循环次数明显高于其它合成条件下的样品,在20℃下的循环电化学比容量持有率大于85%。
This article introduced a sol-gel method which the LiCoO_2-coated LiMn_2O_4 material was prepared by using glycol as a chelating agent and putting commercial LiMn_2O_4 into the solution containing Lithium acetate (LiAc·2H_2O) and cobalt acetate with regulating pH value.The resultant solution was stirred at 85 ℃ in distilled water and vaporized slowly and calcined the mixture. The effects of LiCoO_2 coating amount, calcination temperature and calcination time on the crystal structure, cycling performance a...
出处
《有色矿冶》
2005年第3期31-35,51,共6页
Non-Ferrous Mining and Metallurgy
