硫含量对磷酸铁锂电化学性能的影响  

Influence of sulfur on electrochemical performance of lithium iron phosphate

作　　者：骆艳华[1,2] 何楠[3] 佘世杰 刘晨[2] 潘峰[1] 

机构地区：[1]南京理工大学化工学院,江苏南京210094 [2]中钢集团安徽天源科技股份有限公司,安徽马鞍山243000 [3]中钢集团马鞍山矿山研究院有限公司,安徽马鞍山243000

出　　处：《现代化工》2015年第7期82-85,共4页Modern Chemical Industry

基　　金：国家自然科学基金资助项目(51372117);江苏省公安基础研究基金资助项目(201201004TJ)

摘　　要：考察了硫质量分数分别为0.08%、0.15%、0.22%、0.34%、0.42%、0.68%时对磷酸铁锂的颗粒形貌、放电容量和循环性能的影响。结果表明:当硫质量分数达到一定程度时,对磷酸铁锂的颗粒形貌、放电容量和循环性能的影响逐渐明显,当硫质量分数低于0.22%时,磷酸铁锂颗粒形貌为球状,1 C首次放电容量达到152 m Ah/g,循环150次后,容量仍可维持在140 m Ah/g,电化学性能良好;当硫质量分数高于0.34%时,磷酸铁锂颗粒发生团聚,且1 C首次放电容量低于130 m Ah/g,循环150次后,容量低于107 m Ah/g。The effect of sulfur content on the lithium iron phosphate particle morphology, discharge capacity and cycle performance is studied in this study. The results show that the obvious influence of sulfur content on the lithium iron phosphate particle morphology, discharge capacity and cycle performance can be gradually observed when the amount of sulfur reaches a certain extent. When the amount of sulfur is less than 0. 22%, the morphology of the lithium iron phosphate is spherical particles. The initial discharge capacity is 152 mAh./g and even after 150 times of cycling, its capacity can still be maintained at 140 mAh/g and electrochemical performance is good. However,when the amount of sulfur is higher than 0. 34%, the agglomeration of lithium iron phosphate occurs and the discharge capacity is lower than 130 mAh/g. After cycling for 150 times,the capacity is less than 107 mAh/g.

关 键 词：硫 磷酸铁锂 容量 循环 

分 类 号：O614.81[理学—无机化学]