Study on Mg2+/F--doped Li-Mn-O Spinel as the Cathode for Power Plastic Li-ion Batteries Guan Yonghui, Zhao Xinbing*, Cao Gaoshao, Zhong Yaodong (Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027) Abstract A 10kg-level isotropically cubic spinel of the Mg2+ or F--doped Li-Mn-O, as the cathode for power plastic Li-ion batteries(PPLIB), was synthesized by solid state reaction method at 750℃ in air and characterized by XRD and electrochemical performance testing. It was found that PPLIB based on Li0.98Mn1.94Mg0.06O4/MCMB(Mesocarbon Microbeads) had good electrochemical performance. Its discharge capacity was about 75% of the first discharge capacity 90mAh/g(vs.Li:106 mAh/g) for the cathode after running for 300 cycles at 0.5C charge and discharge rate. PPLIB based on Li0.98Mn1.96Mg0.06O4/MCMB also had good cyclability and a large increase of capacity, its discharge capacities in the 1st and 200th cycles were 98 mAh/g(vs.Li:115 mAh/g) and 73 mAh/g for the cathode, respectively. A great improvement of capacity having first discharge capacity 106mAh/g(vs.Li:120 mAh/g) for the cathode was achieved using LiMn1.96Mg0.04O3.96F0.04, however its cyclability became poor. Key words LiMn2O4, Mg2+ and F - dopants, Plastic Li-ion batteries, Electrochemical property Mg2+/F－掺杂Li-Mn-O 基尖晶石在动力聚合物锂电池中的应用研究 关勇辉 赵新兵* 曹高劭 钟耀东 (浙江大学材料科学与工程系 杭州 310027) 摘 要 采用高温固相反应法制备了 10kg 级具有均一立方相的 Mg2+和 F－掺杂 Li-Mn-O 基尖晶石锂离子电池正极材料，并以该材料作正极组装成模拟电池和动力聚合物锂离子电池(PPLIB)进行研究。结果显示，0.5C 倍率下，Li0.98Mn1.94Mg0.06O4/中间相碳微球(MCMB)系 PPLIB 电化学性能良好，正极首次放电容量约 90mAh/g(对锂：106mAh/g)，经 300 次循环后，容量保持率>75%；Li0.98Mn1.96Mg0.04O3.96F0.04/MCMB 系正极首次放电容量达到 98mAh/g(对锂：115mAh/g)，200 次循环容量保持率>72%；增加正极含锂量的 LiMn1.96Mg0.04O3.96F0.04/MCMB 系正极首次放电容量高达 106mAh/g(对锂：120mAh/g)，但循环性能变差。 关键词 LiMn2O4 Mg2+/F－掺杂 聚合物锂离子电池 电化学性能 关勇辉 男，26 岁，硕士生，现从事聚合物锂离子电池研究。*联系人 E-mail:zhaoxb@zju.edu.cn 2003-10-28收稿，2004-02-06接受 (PDF全文下载c04080)