文档介绍：磷酸铁锂正极材料水热法制备及性能研究
刘晓斐1,黄佳琦2,朱万诚1,*,刘芯言2,彭翃杰2,张强2,* ,魏飞2
1曲阜师范大学化学工程系,山东省曲阜市静轩西路57号,273165
2清华大学化学工程系,北京市海淀区清华园1号,100084
*Email: ******@.cn1, ******@
摘要:橄榄石型LiFePO4具有理论比容量高,热稳定性好等系列优点,是新一代动力型锂离子电池理想的正极材料之一,但本身结构缺陷、电子电导率低、锂离子扩散速率慢等限制了其实际应用。本文以H3PO4, FeSO4·7H2O和LiOH·H2O为原料,考察了非纯水溶剂氮甲基吡咯烷酮(NMP)对LiFePO4水热合成的影响,并采用蔗糖为碳源对其进行碳包覆改性,探究了相关电化学性能。结果表明,NMP能有效抑制晶粒过度生长改善分散性,碳包覆则能够促进LiFePO4颗粒进一步细化; C和5 C (1 C=170 mA/g)时放电比容量分别为130 mAh/g、90 mAh/g,倍率性能良好。
300 nm
(b)
(a)
(c)
XRD pattern (a), SEM image (b), and electrochemical performance (c) of the LiFePO4 cathode materials.
关键词:磷酸铁锂正极材料锂离子电池水热碳包覆
参考文献
[1] . Wang; . Sun. Energy Environ. Sci. 2011, DOI: .
[2] O. Toprakci; . Ji; Z. Lin; et al. J. Power Sources. 2011, 196:7692.
Hydrothermal synthesis and properties of LiFePO4 cathode materials
Xiaofei Liu1, Jiaqi Huang 2, Wancheng Zhu1,*, Xinyan Liu 2, Hongjie Peng 2, Qiang Zhang2,*, Fei Wei 2
1Department of Chemical Engineering, Qufu Normal University, 57#, W Jingxuan Rd, Qufu, Shandong, 273165
2Department of Chemical Engineering, Tsinghua University, 1#, Tsinghua Rd, Beijing, 100084
Abstract: Olivine-type LiFePO4 has been one of the most promising cathode materials for lithium ion batteries due to its series of advantages such as high theoretical capacity, and excellent thermal stability. However,