摘要
采用共沉淀法,通过改变柠檬酸的加入量制备了一系列中间体FePO4·x H2O,之后以合成的FePO4·x H2O为三价铁源,采用两步烧结法来合成LiFePO4/C复合材料,运用XRD、SEM以及电化学测试方法对材料性能进行表征。结果表明:柠檬酸的加入能够有效地控制FePO4·x H2O材料的形态特征及粒径大小,使其分布更为均匀,减弱了团聚现象的发生,而磷酸铁锂的性能也随之受到影响,当柠檬酸加入量较低时,磷酸铁锂在0.1 C充放电倍率下,放电比容量可达到约160 mAh/g,且通过多次充放电循环后,容量保持率在98%以上。但当柠檬酸添加量过多时,材料性能则不能继续提升。
A series of FePO4. x H2O were prepared through a liquid precipitation method by changing the addition amount of citric acid. Several LiFePO,/C composites were synthesized through a two-step sintering process with the as-prepared FePO4 as iron source. The obtained samples were characterized by XRD, SEM and other electrochemical measurement methods. Results show that the morphology and the particle size of FePO4 ·x H2O are influenced by the addition of citric acid. The specific capacities of the LiFePO4 cathodes could reach about 160 mAh/g at 0.1 C and the cycling efficiency over 98% could be obtained when the addition amount of citric acid was low. However, the properties of LiFePO4 could not be improved sequentially with more citric acid addition.
出处
《电源技术》
CAS
CSCD
北大核心
2014年第2期221-224,共4页
Chinese Journal of Power Sources
基金
广东省战略性新兴产业发展专项资金新能源汽车发展项目(301-5)
华南师范大学大学生创新性实验项目经费资助(2012)
关键词
磷酸铁锂
锂离子电池
正极材料
柠檬酸
lithium iron phosphate
lithium ion baterry
cathode material
citric acid
作者简介
郑国瑞（1991-）,男,广东省人,学士,主要研究方向为新能源材料与器件.
通信作者：陈红雨
