摘要
为了合成锂离子电池正极材料LiFePO_4/C,设计开发了一种水热反萃法制备LiFePO_4/C的方法,并重点研究了煅烧温度和时间对LiFePO_4/C的结构、形貌及其电化学性能的影响。分别运用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、恒电流充放电、循环伏安(CV)等测试手段对样品进行了表征。电化学测试结果表明:在煅烧温度为650℃,煅烧时间为4 h的情况下,LiFePO_4/C的电化学性能较好。在0.1、0.2、0.5和1.0 C下,其首次放电比容量分别达到151.7、154.8、149.8和139.1 m Ah·g^(-1)。除此之外,它还具有良好的容量保持率和循环性能。
In order to synthesize lithium-ion battery cathode material LiFePO4/C, a hydrothermal stripping method was designed to synthesize LiFePO4/C cathode materials. The influences of sintering temperatures and time on the structure, morphology and electrochemical performances of LiFePO4/C were investigated. The structure and morphology of samples were characterized using powder X-ray diffraction （XRD）, scanning electron microscopy （SEM）. The electrochemical performances were conducted by galvanostatic charge/discharge test and cyclic voltammetry （CV）. The electrochemical results show that LiFePO4 sintered at 650℃ for 4 h exhibits good electrochemical performance. The LiFePO4/C sample presents the discharge capacity of 151.7 mAh·g-1,154.8 mAh·g-1, 149.8 mAh·g-1 and 139.1 mAh·g-1 at 0.1 C, 0.2 C, 0.5 C and 1 C, respectively. In addition, the LiFePO4/C also shows excellent capacity retention and cycle performances.
出处
《化学工业与工程》
CAS
CSCD
2017年第6期6-10,共5页
Chemical Industry and Engineering
基金
国家自然科学基金(21276185)
关键词
锂离子电池
正极材料
LIFEPO4/C
水热反萃法
电化学性能
lithium-ion battery； cathode material； LiFePO4/C； hydrothermal stripping method； electrochemical performance
