无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2014, Vol. 46 ›› Issue (8): 75-.

• 论文 • 上一篇    

退火工艺对LiNi0.5Mn1.5O4正极材料 电化学性能的影响

郅晓科,叶学海,何爱珍,赵 桢,章 甦,时 洁,王旭阳   

  1. 中海油天津化工研究设计院,天津 300131
  • 出版日期:2014-08-10 发布日期:2014-08-06

Effects of annealing temperatures on electrochemical properties of LiNi0.5Mn1.5O4 cathode materials

 ZHI  Xiao-Ke, YE  Xue-Hai, HE  Ai-Zhen, ZHAO   Zhen, ZHANG   Su, SHI   Jie, WANG  Xu-Yang   

  1. CNOOC Tianjin Chemical Research & Design Institute,Tianjin 300131,China
  • Online:2014-08-10 Published:2014-08-06

摘要: 采用共沉淀法合成LiNi0.5Mn1.5O4正极材料并对其进行退火处理,研究退火温度对材料电化学性能的影响。结果表明,退火温度会导致LiNi0.5Mn1.5O4正极材料中Mn3+含量的变化,进而影响材料的倍率性能和循环性能。其中,625 ℃退火8 h所制备的样品表现出最好的电化学性能,其0.2 C倍率首次放电容量为130.8 mA·h/g;1 C倍率首次放电容量为126.5 mA·h/g,50次循环后,容量保持率高达100.8%。

关键词:  , 锂离子电池, 正极材料, 退火温度, LiNi0.5Mn1.5O4

Abstract: LiNi0.5Mn1.5O4 cathode materials were synthesized by co-precipitated method,and the samples were annealed at different temperatures.Effects of the annealing temperatures on the electrochemical properties of the materials were studied.Results showed that the annealing temperature led to the change of Mn3+ content in LiNi0.5Mn1.5O4 cathode material,thereby affecting the rate performance and cycle performance of the materials.The sample annealed at 625 ℃ for 8 h presented the best electrochemical performance.Its fist discharge capacity reached 130.8 mA·h/g at the rates of 0.2 C,and 126.5 mA·h/g at the rates of 1 C.The capacity retention after 50 cycles at 1 C was 100.8%.

Key words: Li-ion battery, cathode material, annealing temperature, LiNi0.5Mn1.5O4

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