摘要
采用共沉淀法制备添加了La^3+的LiNi0.8Co0.15Al0.05O2正极材料,通过XPS、X射线分析仪、扫描电镜、电化学工作站、电池充放电测试系统详细地探讨了不同添加量的La^3+对材料的结构、形貌和电化学性能的影响。结果显示,与无添加的LiNi0.8Co0.15Al0.05O2正极材料比较,添加了La^3+的材料一次颗粒尺寸更大,球形度更好且材料的电极Rsf+Rct阻抗均显示有所降低;当添加x=0.01时,材料的大电流循环稳定性得到了较大提升,1 C条件下经过100次循环后,添加La^3+材料容量保持率为75.81%,而未添加材料容量保持率只有49.57%;添加了La3+材料制得的电池在0.5、1、5 C倍率下的放电比容量也要明显高于无添加材料。
Co-precipitation method was used to prepare LiNi0.8Co0.15Al0.05O2 anode materials with La^3+added.The XPS,X-ray analyzer,scanning electron microscope,electrochemical workstation,and battery charge and discharge test system were used to discuss the effects of different addition of La^3+on the structure,morphology and electrochemical performance of anode materials.Results show that,compared with the non-added LiNi0.8Co0.15Al0.05O2 cathode material,the material with La3+has a larger primary particle size,better sphericity,and the Rsfand Rct impedance of the martials shows a decrease.When the doping amount of La^3+is x=0.01,the material’s high-current cycle stability is greatly improved.After 100 cycles under 1 C,the capacity retention of La^3+is 75.81%,while that of the non-added materials is only 49.57%.Apart from that,the discharge specific capacity of the battery adding La^3+material at 0.5 C,1 C,or 5 C is also significantly higher than that of non-added materials.
作者
杨金猛
程波明
钟盛文
YANG Jinmeng;CHENG Boming;ZHONG Shengwen(Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Jiangxi Key Laboratory of Power Battery and Materials,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)
出处
《有色金属科学与工程》
CAS
2020年第4期106-112,共7页
Nonferrous Metals Science and Engineering
基金
国家自然科学基金面上资助项目(51874151)。
