锂离子电池正极材料Fe3+掺杂Li1+xV3O8 的制备与电化学性能
PDF下载 (726)史卫良,水 淼*,舒 杰,高 珊,冯 琳,陈亮亮.锂离子电池正极材料Fe3+掺杂Li1+xV3O8 的制备与电化学性能[J].宁波大学学报(理工版),2012,25(03):88-91.DOI:
SHI Wei-liang,SHUI Miao*,SHU Jie,GAO Shan,FENG Lin,CHEN Liang-liang.The Preparation and Electro-chemical Performance of Fe3+-doped Li1+xV3O8 for LIB Cathode Materials[J].Journal of Ningbo University(Natural Science & Engineering Edition),2012,25(03):88-91.DOI:
| Title: | The Preparation and Electro-chemical Performance of Fe3+-doped Li1+xV3O8 for LIB Cathode Materials |
| 作者: | 史卫良, 水 淼*, 舒 杰, 高 珊, 冯 琳, 陈亮亮 |
| Author(s): | SHI Wei-liang, SHUI Miao*, SHU Jie, GAO Shan, FENG Lin, CHEN Liang-liang |
| 关键词: | Fe3+掺杂; 溶胶-凝胶; 电化学性能 |
| Keywords: | Li1+xV3O8; Fe3+doping; sol-gel; electro-chemical performance |
| 分类号: | TM911.1 |
| 文献标识码: | A |
| 摘要: | 采用柠檬酸辅助的溶胶-凝胶法制备了Fe3+掺杂Li1.1Fe0.05V2.95O8 及对比样品LiV3O8 正极 材料. 使用TG-DTA、XRD、FT-IR 等手段表征了正极材料的物理化学特性, 并采用EIS、恒电 流充放电等手段研究了其电化学性能. 结果表明: Fe3+掺杂LiV3O8 与对比LiV3O8 相比, 能在更低 的温度下晶化, 能在相同温度、相同时间煅烧下保持更小的晶粒度. Li1.1Fe0.05V2.95O8 与对比 LiV3O8 相比, 特别是大电流下的放电容量有较大的提高, 在75 mA·g-1, 197mA·g-1, 373mA·g-1 及 重新回到75mA·g-1 电流下的初始放电容量分别是307mAh·g-1, 237mAh·g-1, 162mAh·g-1 和302 mAh·g-1. 在回复到75mA·g-1电流后放电容量能非常稳定保持在278.6mAh·g-1左右, 并同时给出 了初步的理论解释. |
| Abstract: | Fe3+-doped lithium vanadium oxide Li1.1Fe0.05V2.95O8 and blank sample LiV3O8 were synthesized by a citric acid assisted sol-gel process. TG-DTA, XRD, FT-IR were used to characterize the physico-chemical properties of the samples. EIS, galvanostatic charge/discharge tests were applied to investigate the electro-chemical performace of the cathode material. The results show that Fe3+-doped LiV3O8 crystallizes at lower temperature and reserves smaller crystallinity sintered at the same temperature and for the same time compared with LiV3O8 blank. Li1.1Fe0.05V2.95O8 shows larger discharge capacity, especially that at high discharge current. At the charge/discharge current of 75 mA·g-1, 197 mA·g-1, 373 mA·g-1 and coming back to 75 mA·g-1, the initial discharge capacity are 307 mAh·g-1, 237 mAh·g-1, 162 mAh·g-1 and 302 mAh·g-1, respectively. The discharge capacity remains steady at 278.6 mAh·g-1 when the charge/discharge current comes back to 75 mA·g-1. A preliminary explanation was also given. |
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| 备注/Memo: | 收稿日期: 2012?02?29. 宁波大学学报（理工版）网址: http://3xb.nbu.edu.cn 基金项目: 国家科技部973 预研计划（2010CB635116）; 浙江省教育厅科研项目（Y201017390）; 宁波市自然科学基金（2011A610086）; 宁波大学王宽诚基金. 第一作者: 史卫良（1974－）, 男, 江苏宜兴人, 博士, 主要研究方向: 锂离子电池材料. E-mail: zhouhuijie@nbu.edu.cn *通讯作者: 水 淼（1974－）, 男, 浙江宁波人, 博士/副教授, 主要研究方向: 能源材料. E-mail: shuimiao@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
