钨掺杂对LiNi0.88Co0.09Mn0.03O2前驱体生长的影响及其电化学性能
Effects of W-doping on precursor growth of LiNi0.88Co0.09Mn0.03O2 and its electrochemical performance
程磊 1赵义 2黄斌 3赵早文 4李延伟 3李伟3
作者信息
- 1. 桂林理工大学化学与生物工程学院广西电磁化学功能物质重点实验室,桂林 541004;浙江帕瓦新能源股份有限公司,诸暨 311899
- 2. 中南大学冶金与环境学院,长沙 410083
- 3. 桂林理工大学化学与生物工程学院广西电磁化学功能物质重点实验室,桂林 541004
- 4. 海南大学材料科学与工程学院,海口 570228
- 折叠
摘要
采用钨掺杂的前驱体为原料合成LiNi0.88Co0.09Mn0.03O2正极材料.X射线衍射分析表明,钨掺杂可抑制前驱体晶体沿垂直于c轴的方向生长.扫描电镜结果表明,随着钨掺杂量的增加,正极材料的一次颗粒粒度呈减小的趋势.电化学表征证实钨掺杂的优势.掺钨量为0.4％(质量分数)的正极材料相比空白样品具有显著提高的电化学性能,以10C电流密度分别在25和45 ℃下循环100周后,分别具有94.68％和89.63％的容量保持率.同时,钨掺杂还可抑制材料在循环时产生晶间裂纹.因此,得益于钨掺杂对材料成分调节及微观结构调控的协同作用,锂离子在材料中的扩散速率增加,材料的结构稳定性提高.
Abstract
W-doped LiNi0.88Co0.09Mn0.03O2 cathodes were fabricated by using W-doped precursors.X-ray diffraction indicates that W-doping suppresses the crystal growth of the precursor along the direction perpendicular to c-axis.Scanning electron microscopy results show that the primary particles of the cathode become finer with the increase of W-doping amount.Electrochemical measurements prove the merits of the W-doped cathodes.The one with 0.4 wt.％W-doping shows significantly improved electrochemical properties compared with the pristine one.After 100 charge-discharge cycles at a high rate of 10C,it exhibits capacity retentions of 94.68％and 89.63％at 25 and 45 ℃,respectively.The intergranular cracks after cycles are also suppressed by W-doping.Hence,profiting from the synergistic effect of component regulation and microstructure engineering by W-doping,the Li+diffusion kinetics is boosted,and the structural stability is enhanced.
关键词
钨掺杂/前驱体生长/结构稳定性/循环寿命/锂离子电池Key words
W-doping/precursor growth/structural stability/cycle life/lithium-ion batteries引用本文复制引用
基金项目
国家自然科学基金(52004076)
Science and Technology Base and Talent Project of Guangxi,China(GUIKEAD20159049)
广西自然科学基金(2020GXNSFAA297054)
出版年
2024
NETL
NSTL
万方数据