Li2ZrO3包覆LiNi0.8Co0.1Mn0.1O2的复合材料及其电化学性能

以Zr（NO₃）₄·5H₂O和CH₃COOLi·2H₂O为原料，采用湿化学法，将Li₂ZrO₃包覆在LiNi_0.8Co_0.1Mn_0.1O₂锂离子电池正极材料的表面，研究Li₂ZrO₃不同包覆比例对LiNi_0.8Co_0.1Mn_0.1O₂电化学性能的影响。SEM、TEM、EDS谱图分析表明，Li₂ZrO₃层均匀地包覆在LiNi_0.8Co_0.1Mn_0.1O₂表面，其厚度约为8 nm。与纯相相比，1%（质量分数） Li₂ZrO₃包覆的LiNi_0.8Co_0.1Mn_0.1O₂复合材料在1.0 C下首次放电比容量为184.7 mA·h·g^-1、100次循环之后放电比容量为169.5 mA·h·g^-1，其容量保持率达到91.77%，表现出良好的循环稳定性。循环伏安（CV）和电化学阻抗（EIS）测试结果表明，Li₂ZrO₃包覆层抑制了正极材料与电解液之间的副反应，减小了材料在循环过程中的电荷转移阻抗，从而提高了材料的电化学性能。

Composite materials of Li2ZrO3 coated LiNi0.8Co0.1Mn0.1O2 and its electrochemical properties

Li₂ZrO₃ coated LiNi_0.8Co_0.1Mn_0.1O₂ cathode material for lithium ion battery was synthesized by a wet chemical method which using Zr(NO₃)₄·5H₂O and CH₃COOLi·2H₂O as raw materials, and the influences of the different content of Li₂ZrO₃ on the electrochemical properties of LiNi_0.8Co_0.1Mn_0.1O₂ was studied. SEM, TEM and EDS spectra showed that Li₂ZrO₃ coating was uniformly coated on the surface of LiNi_0.8Co_0.1Mn_0.1O₂ with a thickness of about 8 nm. Compared with the pristine material, LiNi_0.8Co_0.1Mn_0.1O₂ coated with 1%(mass) Li₂ZrO₃ exhibited excellent cycle stability with 91.77% capacity retention rate after 100 cycles at 1.0 C(the first discharge capacity was 184.7 mA·h·g^-1, and the specific capacity after 100 cycles was 169.5 mA·h·g^-1). The results of cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) tests demonstrated that the Li₂ZrO₃ coating suppressed the side reaction between cathode material and electrolyte, and reduced the charge transfer resistance of the material during cycling, thus improved the electrochemical properties of the material.