高等学校化学学报

• 研究论文 •    

CTAB辅助水热合成高镍三元材料LiNi0.6Co0.2Mn0.2O2及其高低温性能研究

张会双1,2,3, 高延晓2,3, 王秋娴3,4, 李向南2,3, 刘文凤1,3,4, 杨书廷1,2,3,4()   

  1. 1.河南师范大学物理学院, 新乡 453007
    2.河南师范大学化学化工学院, 新乡 453007
    3.动力电源及关键材料河南省协同创新中心, 新乡 453007
    4.河南电池研究院有限公司, 新乡 453007
  • 收稿日期:2020-07-31 出版日期:2020-12-28 发布日期:2020-12-28
  • 通讯作者: 杨书廷 E-mail:shutingyang@foxmail.com
  • 基金资助:
    河南省重点科技攻关项目(182102310827);河南省高等学校重点科研项目(20B430009);新乡市科技发展规划项目(15GY02)

High-Low Temperature Properties of Ni-rich LiNi0.6Co0.2Mn0.2O2 Cathode Material by Hydrothermal Synthesis with CTAB Assisted

ZHANG Huishuang1,2,3, GAO Yanxiao2,3, WANG Qiuxian3,4, LI Xiangnan2,3, LIU Wenfeng1,3,4, YANG Shuting1,2,3,4()   

  1. 1.School of Physics,Henan Normal University,Xinxiang 453007,China
    2.School of Chemistry and Chemical Engineering Science,Henan Normal University,Xinxiang 453007,China
    3.Collaborative Innovation Center of Henan Province for Motive Power and Key Materials,Xinxiang 453007,China
    4.Henan Battery Research Institute,Xinxiang 453007,China
  • Received:2020-07-31 Online:2020-12-28 Published:2020-12-28
  • Contact: YANG Shuting E-mail:shutingyang@foxmail.com

摘要:

以醋酸盐为原料, 以十六烷基三甲基溴化铵(CTAB)为分散剂, 通过水热合成-高温烧结的方法制备高镍三元正极材料LiNi0.6Co0.2Mn0.2O2. 结果表明, 适量分散剂CTAB的加入可有效调节材料的颗粒形貌尺寸, 降低锂镍混排, 改善材料的电化学性能. 加入2%(质量分数) CTAB时, 制备的电池材料具有完整有序的层状结构, 且颗粒均匀分散, 具有最佳的循环性能和高低温性能. 该材料在室温及倍率1C下循环100次后, 容量保持率为88.5%. 在?20, 25和55 ℃条件下及倍率0.1C充放电时, 首次放电比容量分别为60.3, 168.5和207.2 mA·h/g.

关键词: 高镍正极材料, 水热合成, 分散剂, 高低温性能

Abstract:

Using acetate as raw material, cetyltrimethyl ammonium bromide(CTAB) as dispersing agent, LiNi0.6Co0.2Mn0.2O2 cathode material was synthesized by hydrothermal method after high temperature two-step sintering. The experiments proved that proper addition of the dispersant CTAB can effectively adjust the particle morphology, reduce Ni2+/Li+ cation mixing and improve the electrochemical properties of the material. When 2%(mass fraction) CTAB was added, the LNi0.6Co0.2Mn0.2O2 cathode material had an ordered layered structure and the particles of the material were homogeneous and dispersed. Furthermore, and the optimal cycling performance and the high-low temperature performance were obtained. The retention rate of the material was 88.5 % after 100 cycles in the voltage range of 3.0—4.3 V at a rate of 1C and 25 ℃. The initial discharge specific capacity were 60.3, 168.5 and 207.2 mA·h/g, respectively, at a rate of 0.1C under the environmental conditions of ?20, 25 and 55 ℃, which provided a strong basis for the wider application of the material.

Key words: Ni-rich cathode material, Hydrothermal synthesis, Dispersing agent, High-low temperature performance

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