期刊
SCIENCE CHINA-MATERIALS
卷 61, 期 1, 页码 39-47出版社
SCIENCE PRESS
DOI: 10.1007/s40843-017-9114-0
关键词
lithium ion battery; cathode material; lithium iron phosphate; lithium vanadium phosphate; magnetic property
资金
- National Natural Science Foundation of China [21673051, U1401246]
- Guangdong Province Science & Technology Bureau [2014A010106029, 2014B010106005, 2016A010104015]
- Guangzhou Science & Innovative Committee [201604030037]
- Youth Foundation of Guangdong University of Technology [252151038]
- National Natural Science Foundation of Guangdong Province [U1401246]
- Science and Technology Program of Guangzhou City of China [201508030018]
Nano-sized LiFePO4 center dot Li3V2(PO4)(3)/C was synthesized via a sol-gel route combining with freeze-drying. X-ray diffraction results show that this composite mainly consists of olivine LiFePO4 and monoclinic Li3V2(PO4)(3) phases with small amounts of V-doped LiFePO4 and Fe-doped Li3V2(PO4)(3). The magnetic properties of LiFePO4 center dot Li3V2(PO4)(3)/C are significantly different from LiFePO4/C. Trace quantities of ferromagnetic impurities and Fe2P are verified in LiFePO4/C and LiFePO4 center dot Li3V2(PO4)(3)/C by magnetic tests, respectively. LiFePO4 center dot Li3V2(PO4)(3)/C possesses relatively better rate capacities and cyclic stabilities, especially at high charge-discharge rates. The initial discharge capacities are 136.4 and 130.0 mA h g(-1), and the capacity retentions are more than 98% after 100 cycles at 2 C and 5 C, respectively, remarkably better than those of LiFePO4/C. The excellent electrochemical performances are ascribed to the mutual doping of V3+ and Fe2+, complementary advantages of LiFePO4 and Li3V2(PO4)(3) phases, the residual high-ordered carbon and Fe2P with outstanding electric conductivity in the nanocomposite.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据