LiFePO4/C composites with good rate capability and high energy density were prepared by adding sugar to the synthetic precursor. A significant improvement in electrode performance was achieved. The resulting carbon contents in the sample 1 and sample 2 are 3.06% and 4.95%(mass fraction), respectively. It is believed that the synthesis of LiFe2PO4 with sugar added before heating is a good method because the synthesized particles having uniform small size are covered by carbon. The performance of the cathodes was evaluated using coin cells. The samples were characterized by X2ray diffraction and scanning electron microscope observation. The addition of carbon limits the particles size growth and enables high electron conductivity. The LiFePO4/C composites show very good electrochemical performance delivering about 142 mAh/g specific capacity when being cycled at the C/ 10 rate. The capacity fade upon cycling is very small.

采用自制的LiNi1/3Co1/3Mn1/3O2作正极材料，以石墨作负极，组装成413450型锂离子电池。分别在25℃和55℃下 以310～412V为电压区间，1C充放电，对其电化学性能进行测试和研究。结果表明：55℃下电池的首次放电比容量为143mAh/g，25℃下为138mAh/g；电池在55℃下充放电循环85次，容量保持率为92115%。过充、热冲击和常温短路实验的顺利通过，证明样品材料有很好的安全性能。