高等学校化学学报 ›› 2020, Vol. 41 ›› Issue (6): 1329-1336.doi: 10.7503/cjcu20190719

• 物理化学 • 上一篇    下一篇

纳米Al2O3包覆富锂锰基正极材料Li1.2Ni0.13Co0.13Mn0.54O2的性能研究

陈良丹1,邹伟1,吴亮1,夏凡杰1,2,胡执一1,2,李昱1,2,*(),苏宝连1,3,*()   

  1. 1. 武汉理工大学材料复合新技术国家重点实验室, 武汉 430070
    2. 武汉理工大学微纳结构研究中心, 武汉 430070
    3. 那慕尔大学无机材料化学实验室, 那慕尔 B-5000
  • 收稿日期:2019-12-31 出版日期:2020-06-10 发布日期:2020-03-06
  • 通讯作者: 李昱,苏宝连 E-mail:yu.li@whut.edu.cn;bao-lian.su@unamur.be
  • 基金资助:
    国家自然科学基金(U1663225);国家重点研发计划项目(2016YFA0202602)

Nano-Al2O3 Coated Li-rich Cathode Material Li1. 2Ni0.13Co0.13Mn0.54O2 for Highly Improved Lithium-ion Batteries

CHEN Liangdan1,ZOU Wei1,WU Liang1,XIA Fanjie1,2,HU Zhiyi1,2,LI Yu1,2,*(),SU Baolian1,3,*()   

  1. 1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
    2. Nanostructure Research Centre(NRC), Wuhan University of Technology, Wuhan 430070, China
    3. Laboratory of Inorganic Materials Chemistry(CMI), University of Namur, Namur B-5000, Belgium
  • Received:2019-12-31 Online:2020-06-10 Published:2020-03-06
  • Contact: Yu LI,Baolian SU E-mail:yu.li@whut.edu.cn;bao-lian.su@unamur.be
  • Supported by:
    † National Natural Science Foundation of China(U1663225);National Key Research and Development Program of China(2016YFA0202602)

摘要:

采用纳米三氧化二铝(Al2O3)对富锂锰基正极材料Li1.2Ni0.13Co0.13Mn0.54O2进行表面均匀包覆, 并考察了最优纳米Al2O3包覆量下材料的电化学性能. 扫描电子显微镜(SEM)和透射电子显微镜(TEM)显示了纳米Al2O3对富锂锰基正极材料表面均匀包覆, X射线衍射分析(XRD)结果表明包覆后富锂材料依然具有良好的层状结构. 恒流充/放电循环测试发现, 包覆后的Li1.2Ni0.13Co0.13Mn0.54O2材料的首次放电比容量为249.7 mA·h/g, 循环100次后的容量保持率为89.5%, 与未包覆的Li1.2Ni0.13Co0.13Mn0.54O2材料相比, 容量保持率提升约13%. 循环伏安(CV)和电化学阻抗(EIS)测试结果表明, 纳米Al2O3包覆可有效抑制材料极化, 降低界面阻抗和电荷转移阻抗, 进而提升富锂锰基正极材料的电化学性能.

关键词: 锂离子电池, Li1.2Ni0.13Co0.13Mn0.54O2, 纳米三氧化二铝, 表面改性

Abstract:

The lithium-rich cathode material Li1.2Ni0.13Co0.13Mn0.54O2 were coated uniformly by nano-Al2O3 for highly stable lithium-ion batteries. The optimum content of nano-Al2O3 coating on the structure, surface morphology and electrochemical properties were systematically studied by X-ray diffraction(XRD), scanning electron microscopy(SEM) and transmission electron microscopy(TEM). SEM and TEM results show that the surface of the lithium-rich cathode material is evenly coated with nano-Al2O3. XRD results show that the as-synthesized materials have a layered structure. Electrochemical test results show that the nano-Al2O3 coating is beneficial to improving the discharge specific capacity, rate performance and cycle stability. The nano-Al2O3 coated Li1.2Ni0.13Co0.13Mn0.54O2 material has a specific discharge capacity of 249. 7 mA·h/g with excellent cycling stability(89.5% capacity retention after 100 cycles). Cyclic voltammetry(CV) and electrochemical impedance(EIS) results show that nano-Al2O3 coating can effectively inhibit the erosion of HF, reduce electrode material/electrolyte interface side-reactions, decrease polarization, reduce interface impedance and charge transfer impedance. This work suggests that the nano-Al2O3 coating is an effective route to significantly improve the electrochemical performance of lithium-rich cathode materials.

Key words: Lithium-ion battery, Li1. 2Ni0.13Co0.13Mn0.54O2, Nanometer aluminum trioxide, Surface modification

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