摘要
磷酸铁锂由于其安全性好,价格低廉,理论比容量高等优势而成为一种重要的锂离子电池正极材料。本文利用微生物法与水热法相结合的新方法成功制备出介孔LiFePO4/C原位复合材料。以微生物为模板和碳源,通过与金属离子和磷酸根离子的矿化作用形成盐类混合物,经200℃水热反应,从而形成LiFePO4/C原位复合材料。通过结构与性能表征,该复合材料具有介孔球形结构,在0.1 C倍率下的首次放电容量可达到134 mA.h.g-1,比普通水热法合成的样品的比容量提高了近30%,且其充放电性能有着很好的对称性和较小的极化现象。其性能显著提高的主要原因是材料具有介孔球形结构和原位复合碳的存在,从而促进了锂离子的嵌入与脱出和电子传导。
Lithium iron phosphate because of its security good, the price is cheap, higher specific capacity theory advantage and become a kind of important lithium ion battery anode materials. This paper, by using microbial method and the hydrothermal method successful synthesis of mesoporous out LiFePO4/C in situ composite material. Based on microorganism as templates and carbon source, through with metal ion and phosphate ion of mineralization formation saline mixture, the 200 ℃ water dicafing, thus forming LiFePO4/C in situ composite material. Through the structure and performance characterization, this composite material has mesoporous spherical structure, in 0. 1 C ratio of the first discharge capacity can reach 134 mA - h . g-1, than the ordinary hydrothermal synthesis method of the sample of the specific capacity increased nearly 30%, and the charge and discharge performance are very good symmetry and smaller polarization phenomenon. Its performance significantly improve is the main reason of the mesoporous materials have spherical structure and in situ composite carbon exists, so as to promote the lithium ion embedding and emersion and electronic conduction.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2013年第4期712-715,共4页
Journal of Synthetic Crystals
基金
国家自然科学基金(51172132)
关键词
磷酸铁锂
微生物-水热法
原位复合材料
电化学性能
lithium iron phosphate
bio-hydrothermal method
in-situ composite
electrochemicalperformance
