摘要
实验采用碳热还原法制备橄榄石型磷酸铁锂。研究了在制备过程中加入硅烷偶联剂对产物表面形貌及性能的影响。结果表明:添加硅烷偶联剂没有改变磷酸铁锂的橄榄石结构。葡萄糖炭化前加入2.5%KH550的样品颗粒细小清晰,颗粒明显呈现椭圆形,团聚现象减弱,葡萄糖炭化后分散度高。加入硅烷偶联剂明显提高LiFePO4的电性能;而葡萄糖炭化前加入2.5%KH550的样品具有最高的首次放电比容量139 mAh/g。
In this experiment, olivine-type lithium iron phosphate was synthesized by carbothermal reduction method. The influence of adding silane coupling agent on the surface morphology and capacity was studied during the preparation. The result shows that adding silane coupling agent has not changed it＇s olivine-type. Adding 2.5% KH550 before carbonization of glucose, the grains of the sample are wee, clear and show olivine-type obviously; at the same time, the phenomenon of reunion become weaken and the carbonization of glucose has the best dispersity. Adding silane coupling agent can raise the electric properties of lithium iron phosphate. Adding 2.5% KH550 before carbonization of glucose, the sample has the best first discharge specific capacity, which achieved to 139 mAh/g.
出处
《电源技术》
CAS
CSCD
北大核心
2012年第12期1797-1799,共3页
Chinese Journal of Power Sources
关键词
磷酸铁锂
锂离子电池
硅烷偶联剂
正极材料
碳热还原法
lithium iron phosphate
lithium-ion battery
silane coupling agent
cathode material
bothermal reduction method
