无机材料学报 ›› 2021, Vol. 36 ›› Issue (7): 718-724.DOI: 10.15541/jim20200522

所属专题: 【虚拟专辑】锂离子电池(2020~2021)

• 研究论文 • 上一篇    下一篇

锂离子电池高镍LiNi0.8Mn0.2O2正极材料的微波合成及其Co、Al共改性

付宇坤1(), 曾敏1, 饶先发1, 钟盛文1, 张慧娟2, 姚文俐1()   

  1. 1.江西理工大学 材料冶金化学学部, 赣州 341000
    2.上海理工大学 材料科学与工程学院, 上海 200240
  • 收稿日期:2020-09-07 修回日期:2021-01-04 出版日期:2021-07-20 网络出版日期:2021-01-25
  • 通讯作者: 姚文俐, 副教授. E-mail:wenliyao@126.com
  • 作者简介:付宇坤(1996-), 男, 硕士研究生. E-mail:475322904@qq.com
  • 基金资助:
    江西省自然科学基金(20192BAB206021);江西省教育厅(GJJ190423);江西省教育厅(GJJ200850);赣市财教字([2019] 60);国家自然科学基金(51874151)

Microwave-assisted Synthesis and Co, Al Co-modification of Ni-rich LiNi0.8Mn0.2O2 Materials for Li-ion Battery Electrode

FU Yukun1(), ZENG Min1, RAO Xianfa1, ZHONG Shengwen1, ZHANG Huijuan2, YAO Wenli1()   

  1. 1. Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China
    2. School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200240, China
  • Received:2020-09-07 Revised:2021-01-04 Published:2021-07-20 Online:2021-01-25
  • Contact: YAO Wenli, associate professor. E-mail:wenliyao@126.com
  • About author:FU Yukun(1996-), male, Master candidate. E-mail:475322904@qq.com
  • Supported by:
    Natural Science Foundation of Jiangxi Province(20192BAB206021);Foundation of Jiangxi Educational Committee(GJJ190423);Foundation of Jiangxi Educational Committee(GJJ200850);Finance and Education Plan of Ganzhou City([2019] 60);National Natural Science Foundation of China(51874151)

摘要:

高镍正极材料由于较高的比容量和性价比而受到关注, 但在循环过程中稳定性较差且安全性能不佳, 限制了其更广泛的应用。本研究结合微波辅助共沉淀与高温固相法制备高镍正极LiNi0.8Mn0.2O2二元材料, 再掺入不同比例的Co、Al对材料进行改性研究。结果表明, 改性后的材料性能明显改善, 特别是LiNi0.8Mn0.1Co0.08Al0.02O2在2.75~4.35 V、1C下循环100次后容量保持率达到91.39%, 在5C下放电比容量仍有160.03 mAh∙g-1, 并且掺杂后的材料具有较高的热稳定性, 安全性得到提升。其优异的循环保持率归因于Co、Al较好地抑制了循环过程中H2→H3相变的不可逆性对材料结构稳定性的破坏, 以及较弱的电极反应极化, 使电荷转移电阻降低。

关键词: LiNi0.8Mn0.2O2, Co、Al共改性, 微波辅助共沉淀, 循环性能, 倍率性能

Abstract:

Due to high specific capacity and cost performance, high-nickel cathode materials have received much attention. However, its further application is hindered by poor stability and safety performance during cycling. In this work, Ni-rich LiNi0.8Mn0.2O2 materials were prepared through microwave-assisted co-precipitation followed by high-temperature solid-phase method, which can be further modified by doping different proportions of Co and Al. As a result, LiNi0.8Mn0.1Co0.08Al0.02O2 (NMCA-2) exhibits the best electrochemical performance, whose capacity retention rate reaches 91.39% after 100 cycles at 1C in the voltage range between 2.75 and 4.35 V, and still owns a specific discharge capacity of 160.03 mAh∙g-1 at 5C. Its excellent cyclic retention rate can be attributed to the restrained irreversibility of H2→H3 phase transition during cycling with Co and Al doping, and the lower reaction polarization which contributed to the decline of charge transfer resistance, resulting in good cycle and rate performance of the material. Furthermore, high thermal stability of NMCA-2 improves the safety of the material.

Key words: LiNi0.8Mn0.2O2, Co,Al co-modification, microwave-assisted coprecipitation, cycle performance, rate performance

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