物理化学学报 >> 2013, Vol. 29 >> Issue (09): 1989-1997.doi: 10.3866/PKU.WHXB201306181

电化学和新能源 上一篇    下一篇

不同碳源合成Na2MnPO4F/C及其作为锂离子电池正极材料的性能

钟艳君1,2, 李君涛2, 吴振国1, 钟本和1, 郭孝东1, 黄令2, 孙世刚2   

  1. 1 四川大学化学工程学院, 四川 成都 610065;
    2 厦门大学能源研究院, 固体表面与物理化学国家重点实验室, 化学化工学院, 福建 厦门 361005
  • 收稿日期:2013-03-19 修回日期:2013-06-17 发布日期:2013-08-28
  • 通讯作者: 李君涛, 郭孝东 E-mail:jtli@xmu.edu.cn; xiaodong2009@163.com
  • 基金资助:

    国家自然科学基金(50574063, 21021002, 21003102), 四川大学青年科学家基金(2011SCU11081)和高等教育博士点科研基金(20120181120103)资助

Synthesis of Na2MnPO4F/C with Different Carbon Sources and Their Performances as Cathode for Lithium Ion Battery

ZHONG Yan-Jun1,2, LI Jun-Tao2, WU Zhen-Guo1, ZHONG Ben-He1, GUO Xiao-Dong1, HUANG Ling2, SUN Shi-Gang2   

  1. 1 School of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China;
    2 School of Energy Research, State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
  • Received:2013-03-19 Revised:2013-06-17 Published:2013-08-28
  • Contact: LI Jun-Tao, GUO Xiao-Dong E-mail:jtli@xmu.edu.cn; xiaodong2009@163.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50574063, 21021002, 21003102), Sichuan University Funds for Young Scientists, China (2011SCU11081), Research Fund for the Doctoral Program of Higher Education, the Ministry of Education, China (20120181120103).

摘要:

采用湿法球磨和原位热解碳包覆相结合的方法, 分别以硬脂酸、柠檬酸、聚乙二醇-6000 (PEG-6000)、β-环糊精为碳源, 制备了不同结构的Na2MnPO4F/C 复合材料, 并研究了它们作为锂离子电池正极材料的电化学行为. 通过X射线衍射(XRD)、扫描电镜(SEM)、BET比表面积测试、恒流充放电等表征手段, 比较和分析了产物的结构、形貌及电化学性能. 研究结果表明, 由不同碳源制备的材料在形貌和颗粒尺寸上有明显差异, 进而对它们的电化学性能造成很大影响. 影响电化学性能的关键因素在于材料一次颗粒的大小. 其中, 以柠檬酸为碳源制备的样品呈现出典型的微纳结构和最小的一次颗粒(10-40 nm). 并给出最佳的电化学性能: 在1.5-4.8 V电压范围内, 以5 mA·g-1充放电电流获得的首次放电比容量约为80 mAh·g-1, 且循环稳定性良好.

关键词: 锂离子电池, 正极材料, Na2MnPO4F/C, 碳源, 形貌

Abstract:

Na2MnPO4F/C composites were synthesized by wet ball milling and in situ pyrolytic carbon coating. Stearic acid, citric acid, poly(ethylene glycol) 6000, and β-cyclodextrin were used as carbon sources in the synthesis process. The structures, morphologies, and electrochemical performances of the as-synthesized Na2MnPO4F/C composites were further investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller surface area analysis, and galvanostatic chargedischarge tests. Distinct differences were observed in the morphologies and sizes of the Na2MnPO4F/C particles obtained from different carbon sources, and this significantly affected their electrochemical performances. It was found that the primary particle size of the Na2MnPO4F/C material is a key factor in the electrochemical performance. The sample synthesized using citric acid as the carbon source had a micro-nano structure, with the smallest primary particle size of 10-40 nm, and displayed the best electrochemical properties. It delivered an initial discharge capacity of 80 mAh·g-1 under a current density of 5 mA·g-1 in the voltage range of 1.5-4.8 V, and displayed good cycling performance.

Key words: Lithium ion battery, Cathode, Na2MnPO4F/C, Carbon source, Morphology

MSC2000: 

  • O646