压力对富锂氧化物材料电化学性能的影响  

Effects of pressure on electrochemical performance for lithium-rich oxide materials

作　　者：陈东瑞 高圣清 CHEN Dongrui;GAO Shengqing(School of Mechanical and Energy Engineering,Shaoyang University,Shaoyang 422000,China;Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing,Shaoyang University,Shaoyang 422000,China)

机构地区：[1]邵阳学院机械与能源工程学院,湖南邵阳422000 [2]邵阳学院高效动力系统智能制造湖南省重点实验室,湖南邵阳422000

出　　处：《邵阳学院学报（自然科学版）》2022年第6期26-32,共7页Journal of Shaoyang University：Natural Science Edition

基　　金：湖南省教育厅科学研究项目优秀青年项目(22B0747);邵阳学院大学生科技创新创业培养孵化基地(2020RC1011);邵阳学院研究生科研创新项目资助(CX2021SY021);湖南省学位与研究生教学改革研究项目(2021JGYB208)。

摘　　要：富锂氧化物正极材料具有优异的电化学性能而备受广泛的关注。为了进一步提高材料性能,探究在材料烧结过程中,压力对富锂材料电化学性能的影响,施加压力对晶格结构及电化学性能的影响规律,采用溶胶-凝胶法制备富锂氧化物材料,并在烧结过程中施加不同的压力。通过X射线衍射(X-ray diffractometer,XRD)分析发现,将不同压力施加在样品上,其晶体结构没有多大的差异,但晶胞参数却有明显的不同。通过扫描电子显微镜(scanning electron microscope,SEM)观察发现,在不同压力下样品的颗粒大小和微观结构略有不同。试验结果表明,该材料在620 MPa压力下,材料具有最佳性能。The excellent electrochemical properties of lithium-rich oxide cathode materials have attracted extensive attention.The effects of pressure on the electrochemical properties of lithium-rich materials in the process of material sintering are explored in this work to further improve the material properties.Besides,the effects of pressure on the crystal structure and electrochemical properties of lithium-richs during sintering are also analyzed and discussed.The sol-gel method was used to prepare the lithium-rich oxide materials,and different pressures were added in the sintering process.In accordance with the analysis of X-ray diffractometer(XRD),no significant difference in the crystal structure of the samples by adding different pressures was found,but the significant differences were found in the cell parameters.In line with scanning electron microscope(SEM)observation,the particle size and microstructure of the samples were slightly different at various pressures.Therefore,the test results show that the best performance of the material can be embodied at 620 MPa pressure.

关 键 词：锂离子电池 富锂氧化物 压力 电化学性能 

分 类 号：TM911.11[电气工程—电力电子与电力传动]