电化学2017，Vol.23Issue(6)：675-683,9.DOI:10.13208/j.electrochem.161229
锂离子电池正极材料LiNi0.5Co0.2Mn0.3O2和LiNi0.5Co0.2Mn0.3O2/LiFePO4容量衰减原因分析
Capacity Fading Analyses of LiNi0.5Co0.2Mn0.3O2 and LiNi0.5Co0.2Mn0.3O2/LiFePO4 Cathode Materials for Lithium-Ion Battery
胡燚 1何湘柱 1邓忠德 1孔令涌 2尚伟丽2
作者信息
- 1. 广东工业大学轻工化工学院,广东广州510006
- 2. 深圳市德方纳米科技股份有限公司,广东深圳518055
- 折叠
摘要
Abstract
The LiNi0.5Co0.2Mn0.3O2/LiFePO4 (NMC532/LFP) composite cathode material for lithium-ion battery was prepared by wet ball-milling.The capacity fading behaviors of LiNi0.5Co0.2Mn0.3O2 (NMC532) and LiNi0.5Co0.2Mn0.3O2/LiFePO4 (NMC532/LFP) were analyzed by X-ray diffraction (XRD),scanning electron microscope (SEM),charge/discharge and electrochemical impedance spectroscopy (EIS) tests.The results indicated that the capacity retention values of NMC532/LFP were 97.80％ and 86.48％,respectively,after 50 cycles and 60 ℃ high temperature storage.The NMC532/LFP exhibited better cycle performance and high temperature storage performance.Charge transfer impedance (Rct) values increased obviously after 50 cycles and high temperature storage,in particular,the Rct value of NMC532/LFP was smaller.The I(003)/I(104) values of NMC532 and NMC532/LFP were reduced,while that of NMC532/LFP became larger,illustrating the cation mixed phenomenon was improved.There were no apparent particle cracking and particle fracture phenomena observed after 50 cycles,however,some NMC532 powder particles were obtained.The cracks were obaerved on the surface of NMC532 particles and among particles after high temperature storage,and the slight pulverization occurred on the surface of NMC532/LFP particles.Less ordered material structure,higher degree of cation mixing and increased charge transfer resistance might be mainly responsible for the capacity fading behaviors of NMC532 and NMC532/LFP.关键词
湿法球磨法/锂离子电池/混合正极材料/LiNi0.5Co0.2Mn0.3O2/LiFePO4/容量衰减机理Key words
wet ball-milling/Li-ion battery/composite cathode material/LiNi0.5Co0.2Mn0.3O2/LiFePO4/capacity fading mechanism分类
化学化工引用本文复制引用
胡燚,何湘柱,邓忠德,孔令涌,尚伟丽..锂离子电池正极材料LiNi0.5Co0.2Mn0.3O2和LiNi0.5Co0.2Mn0.3O2/LiFePO4容量衰减原因分析[J].电化学,2017,23(6):675-683,9.
