锂离子电池正极片的力学性能及影响因素
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摘要
采用小型拉伸试验机、SEM、X射线能谱仪(EDS)和激光共聚焦显微镜等,对正极集流体(压延铝箔)以及对应正极极片的表面形貌、力学性能、集流体表面粗糙度等进行分析。正极片的涂覆层物质呈粒状,粒径分布于1. 4～6. 6μm。涂覆颗粒表面及颗粒间有类似絮状的黏结剂,颗粒间有空隙。集流体铝箔的抗拉强度为113 MPa,延伸率为2. 6%;正极片抗拉强度为19 MPa,延伸率为1. 6%。极片上涂覆物的弹性模量为2 GPa,黏结剂柔性较差。辊压密实后,铝箔集流体的表面粗糙度降低。
The surface morphology,mechanical properties and roughness of aluminum foil and corresponding electrode were analyzed by a small tensile test machine,SEM,energy dispersive spectrometer( EDS) and laser confocal microscopy. The coating of the positive plates were granular and the particle size was mainly in the distribution of 1. 4-6. 6 μm. There were flocs like adhesive binder on the surface of coated particles or between the particles. There were some gaps between the particles. For the aluminum foil,the tensile strength was 113 MPa,the elongation was 2. 6%. For the positive plates,the tensile strength was 19 MPa and the elongation ratio was only 1. 6%. The elasticity modulus of the coating binder was 2 GPa and the binder flexibility was poor. After rolling compaction,the surface roughness of the aluminum foil collector was greatly reduced.
The surface morphology,mechanical properties and roughness of aluminum foil and corresponding electrode were analyzed by a small tensile test machine,SEM,energy dispersive spectrometer( EDS) and laser confocal microscopy. The coating of the positive plates were granular and the particle size was mainly in the distribution of 1. 4-6. 6 μm. There were flocs like adhesive binder on the surface of coated particles or between the particles. There were some gaps between the particles. For the aluminum foil,the tensile strength was 113 MPa,the elongation was 2. 6%. For the positive plates,the tensile strength was 19 MPa and the elongation ratio was only 1. 6%. The elasticity modulus of the coating binder was 2 GPa and the binder flexibility was poor. After rolling compaction,the surface roughness of the aluminum foil collector was greatly reduced.
引文
[1]杜飞虎.高容量锂离子电池负极材料的制备及性能研究[D].上海:上海交通大学,2015.
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[2]PASQLLIER A,ZHENG T,AMATUCCI G,et al.Microstructure effects in plasticized electrodes based on PVDF-HFP for plastic Li-ion batteries.[J].J Power Sources,2001,97(98):758-761.
[3]CHO G B,LEE B K,SIN W C,et al.Effects of Cu current collector as a substrate on electrochemical properties of Li/Si thin film cells[J].J Mater Sci,2006,41:313-315.
[4]郭战胜,王宇晖,朱建宇,等.铝箔力学性能的实验研究[J].实验力学,2016,31(4):451-457.
[5]韩立朝,彭华.工程力学[M].武汉:武汉大学出版社,2006.