物理化学学报 >> 2008, Vol. 24 >> Issue (03): 513-519.doi: 10.3866/PKU.WHXB20080329

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LiOH-LiNO3低共熔混合锂盐体系合成LiNi1/3Co1/3Mn1/3O2

常照荣; 陈中军; 吴锋; 汤宏伟; 朱志红   

  1. 河南师范大学化学与环境科学学院, 河南 新乡 453007; 北京理工大学化工与环境学院, 北京 100080
  • 收稿日期:2007-09-07 修回日期:2007-12-18 发布日期:2008-03-10
  • 通讯作者: 吴锋 E-mail:wufeng863@vip.sina.com

Synthesis of LiNi1/3Co1/3Mn1/3O2 Cathode Material by Eutectic Molten Salt LiOH-LiNO3

CHANG Zhao-Rong; CHEN Zhong-Jun; WU Feng; TANG Hong-Wei; ZHU Zhi-Hong   

  1. College of Chemistry and Environmental Science, Henan Normal University, Xinxiang 453007, Henan Province, P. R. China; College of Chemical Engineering and Environmental, Beijing Institute of Technology, Beijing 100080, P. R. China
  • Received:2007-09-07 Revised:2007-12-18 Published:2008-03-10
  • Contact: WU Feng E-mail:wufeng863@vip.sina.com

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摘要： 利用低共熔组成的0.38LiOH·H2O-0.62LiNO3混合锂盐体系, 与钴、镍、锰的氢氧化物在低温下自混合, 无需前期研磨和后续洗涤, 直接制备出锂离子正极材料LiNi1/3Co1/3Mn1/3O2. X射线衍射分析结果表明, 合成的LiNi1/3Co1/3Mn1/3O2结晶度高, 具有规整的层状琢-NaFeO2结构, 扫描电镜显示产物颗粒均匀, 振实密度高达2.87 g·cm-3. XPS分析结果表明, 合成的样品中Ni、Co、Mn的价态分别是2+、3+、4+. 充放电测试表明, 材料具有良好的电化学性能, 首次放电比容量为160 mAh·g-1, 循环50 次后,材料的电化学性能没有明显的衰减.

关键词: 低共熔盐, 正极材料, XPS, LiNi1/3Co1/3Mn1/3O2

Abstract: The powder of LiNi1/3Co1/3Mn1/3O2 were prepared directly without artificial grinding and washing by a eutectic molten-salt mixture (0.38LiOH·H2O-0.62LiNO3) method. According to this method, the eutectic molten-salt mixture was self-mixed with precursor thoroughly at low temperature, and then sintered at a certain temperature. The tap-density of the powder obtained was 2.87 g·cm-3. The well-layered 琢-NaFeO2 structure and regular morphology were confirmed by X-ray diffraction (XRD) and scanning electronmicroscopy (SEM).XPSstudies showed that the predominant oxidation states of Ni, Co, andMn in the compound were 2+, 3+, and 4+, respectively. Cathodic behaviour was examined by charge-discharge cycling. The synthesized powder showed a reversible capacity of 160 mAh·g -1 at a specific current of 0.2C in the rang 3.0-4.3 V up to 50 cycles without noticeable capacity-fading.

Key words: Eutectic molten salt, Cathode material, XPS, LiNi1/3Co1/3Mn1/3O2