高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (6): 1267.doi: 10.7503/cjcu20170533

• 物理化学 • 上一篇    下一篇

LiNi0.8Co0.2-2xAlxMnxO2材料的制备与电化学储能性能

李欢, 江奇(), 邱家欣, 刘青青, 高艺珂, 卢晓英, 胡爱琳   

  1. 西南交通大学超导与新能源研发中心, 生命科学与工程学院, 材料先进技术教育部重点实验室, 成都 610031
  • 收稿日期:2017-08-03 出版日期:2018-06-10 发布日期:2018-04-25
  • 基金资助:
    国家自然科学基金(批准号: 50907056, 51602266)、 四川省重点研发计划项目(批准号: 2017GZ0109)、 四川省科技支撑项目(批准号: 2016GZ0273, 2016GZ0275)、 四川省学术与技术带头人培养基金和四川省成都市科技惠民工程(批准号: 2014-HM01-00073-SF)资助.

Preparation and Electrochemical Energy Storage Performances of LiNi0.8Co(0.2-2x)AlxMnxO2 Cathode Material

LI Huan, JIANG Qi*(), QIU Jiaxin, LIU Qingqing, GAO Yike, LU Xiaoying, HU Ailin   

  1. Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Life Science and Engineering, Superconductivity and New Energy R&D Centre, Southwest Jiaotong University, Chengdu 610031, China
  • Received:2017-08-03 Online:2018-06-10 Published:2018-04-25
  • Contact: JIANG Qi E-mail:jiangqi66@163.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos. 50907056, 51602266), the Sichuan Province Key Research and Development Program, China(No. 2017GZ0109), the Sichuan Province Science and Technology Support Projects, China(Nos. 2016GZ0273, 2016GZ0275), the Sichuan Province Academic and Technical Leaders Training Fund and the Chengdu Science and Technology Huimin Project, China(No. 2014-HM01-00073-SF).

摘要:

采用高温固相法制备了LiNi0.8Co0.2-2xAlxMnxO2(x=0, 0.005, 0.01, 0.025, 0.04, 0.05)系列材料, 并对材料的形貌、 结构和电化学性能等进行了表征. 研究结果表明, 所得材料均具有α-NaFeO2结构, 阳离子混排程度随着锰、 铝元素的增加和钴元素的减少呈现先减小后增加的趋势. 当x=0.01时, 材料的锂镍混排程度最低, 拥有最小的电荷转移阻抗和较大的锂离子扩散系数, 电化学性能和稳定性最好. 在0.1C下, 放电比容量可达175.2 mA·h/g; 在0.2C下, 循环50周后容量保持率为92.7%.

关键词: 高镍材料, 锂镍混排, 电化学储能性能, 共掺杂

Abstract:

A series of LiNi0.8Co(0.2-2x)AlxMnxO2(x=0, 0.005, 0.01, 0.025, 0.04, 0.05) materials was prepared by high temperature solid phase method. The morphology, structures and electrochemical performances of the materials were characterized. The results showed that all the obtained materials had α-NaFeO2 structure and the degree of lithium nickel cation mixing decreased first and then increased with the increase of manganese, aluminum elements along with cobalt element decreasing. When x was equal to 0.01, the material had the lowest degree of lithium nickel cation mixing, the smallest charge transfer impedance and larger lithium ion diffusion coefficient. And the material exhibited the best electrochemical performances and stability among the obtained materials: its discharge capacity was up to 175.2 mA·h/g at 0.1C; the capacity retention rate was up to 92.7% after 50 cycles at 0.2C.

Key words: High-nickel material, Lithium nickel cation mixing, Electrochemical energy storage performance, Co-doping

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