物理化学学报 >> 2007, Vol. 23 >> Issue (Supp): 31-35.doi: 10.3866/PKU.WHXB2007Supp08

研究论文 上一篇    下一篇

锂离子电池用5 V正极材料LiMn1.5Ni0.5-xCuxO4的性能

张春玲; 江卫军; 张晶; 其鲁   

  1. 中信国安盟固利新能源科技有限公司, 北京 102200; 北京大学化学与分子工程学应用化学系, 新能源材料与技术实验室院, 北京 100871
  • 收稿日期:1900-01-01 修回日期:1900-01-01 发布日期:2008-01-04
  • 通讯作者: 其鲁 E-mail:qilu@pku.edu.cn

Performance of LiMn1.5Ni0.5-xCuxO4 as 5V Cathode Material for Lithium-ion Battery

ZHANG Chun-Ling; JIANG Wei-Jun; ZHANG Jing; QI Lu   

  1. CITIC Guoan Mengguli New Engery Technology Co. Ltd., Beijing 102200, P. R. China; New Energy Material and Technology Laboratory, Department of Applied Chemistry, College of Chemical and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:1900-01-01 Revised:1900-01-01 Published:2008-01-04
  • Contact: QI Lu E-mail:qilu@pku.edu.cn

摘要: 以MnSO4·H2O、NiSO4·6H2O、CuCl2·2H2O、NaOH、NH3·H2O和LiOH·H2O为原料, 采用液相共沉淀法合成尖晶石结构5 V正极材料LiMn1.5Ni0.5-xCuxO4. 所制备的材料在电压范围为3.0-5.0 V, 放电电流密度为0.50 mA·cm-2时, 采用两段法制备的材料的初始放电容量最高, 其首次放电容量可达129.4 mAh·g-1; 放电电流密度为2.00 mA·cm-2时, 最大放电容量可达127.1 mAh·g-1; 采用三段法制备的材料的循环性能最好, 50次循环之后容量没有衰减. 材料的振实密度可达2.1 g·cm-3. 初步探索了高电压正极材料LiMn1.5Ni0.5-xCuxO4在以石墨为负极时的循环性能. 在放电电流密度为2.00 mA·cm-2 时, 200次循环后容量保持率为67%, 平均每次衰减率为1.7‰.

关键词: 锂离子电池, 共沉淀, 5 V 正极材料, 尖晶石LiMn1.5Ni0.5-xCuxO4

Abstract: The product LiMn1.5Ni0.5-xCuxO4 with cubic spinel structure was synthesized by a chemical co-precipication method. MnSO4·H2O, NiSO4·6H2O, CuCl2·2H2O, NaOH, NH3·H2O and LiOH·H2O were used as the initial materials. The LiMn1.5Ni0.5-xCuxO4 powder was characterized by X-ray diffraction, scanning electron microscopy, tap density testing and electrochemical testing. The LiMn1.5Ni0.5-xCuxO4 material synthesized by two-stage process delivers a discharge capacity of 129.4 mAh·g-1 and 127.1 mAh·g-1 in the range of 3.0-5.0 V at the discharge current density of 0.50 mA·cm-2 and 2.00 mA·cm-2 individually. The material synthesized by three-stage process has a perfect cycle performance. Its discharge capacity can retain more than 98% of the initial capacity after 50 cycles between 3.0 and 5.0 V. Tap density of the material synthesized by three-stage process reaches 2.1 g·cm-3. In addition, the cycle performance of material synthesized was discussed with graphite as the anode. The average numerical decrement of discharge capacity is 1.7‰ after 200 cycles at the discharge current density of 2.00 mA·cm-2.

Key words: Lithiumion battery, Co-precipitation, 5 V Cathode material, Spinel LiMn1.5Ni0.5-xCuxO4

MSC2000: 

  • O646