碳热还原法合成高密度球形LiFePO_4/C  

High-density and spherical LiFePO_4/C prepared by carbothermal reduction method

作　　者：卢文斌[1] 熊凯[1] LU Wen-bin;XIONG Kai(Shenzhen Academy of Metrology & Quality Mspection, Shenzhen Guangdong 518055, China)

机构地区：[1]深圳市计量质量检测研究院,广东深圳518055

出　　处：《电源技术》2017年第12期1686-1687,1726,共3页Chinese Journal of Power Sources

基　　金：深圳市战略新兴产业发展专项资金(GGJS2015-0730142313486)

摘　　要：通过水热-碳热还原法,合成了高密度球形LiFePO_4/C材料。通过扫描电子显微镜(SEM)和振实密度测试发现,LiFePO_4/C的振实密度得到显著提高,达到1.553g/cm^3。通过恒流充放电测试表明,适当的碳包覆能改善LiFePO_4材料的电化学性能。在0.1C下,2.5~4.2V进行充放电,首次放电比容量为137.63mAh/g,10C时放电比容量维持在76.71mAh/g左右。By hydrothermal-carbothermal reduction method,the high-density and spherical LiFePO4/C materials were prepared.The SEM and tap density tests show that the materials have higher tap density,reaching1.553g/cm3.The constant current charge-discharge tests show the carbon coating can improve the electrochemical performance.In terms of charge/discharge curves at the cut-off voltages of2.5and4.2V,the first discharge specific capacity reaches137.63mAh/g at0.1C,and the specific capacity is76.71mAh/g at10C.

关 键 词：LIFEPO4/C 球形 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]