新型锂离子电池复合负极材料3Li_4Ti_5O_(12)·NiO的制备及性能研究

Prepration and Properties of 3Li_4Ti_5O_(12)·NiO Composites as a Potential Anode Material for Lithium-ion Batteries

采用喷雾干燥法合成了3Li4Ti5O12·Ni O复合负极材料。XRD结果表明,复合Ni O没有改变Li4Ti5O12的晶体结构。SEM结果表明,样品为直径0.5-3μm的球形颗粒。电化学测试结果表明,3Li4Ti5O12·Ni O较Li4Ti5O12倍率性能和循环性能得到极大地提高。该复合材料在0.1 C、1 C和20 C倍率下的放电比容量分别为372.8 m Ah·g^-1、252.6 m Ah·g^-1和204.8 m Ah·g^-1,在20 C倍率下循环300次后的容量保持率为98.7%。

3Li4Ti5O12· Ni O composite anode material was prepared by a spray-drying process. XRD results show that incorporation of Ni O does not change the structure of Li4Ti5O12. SEM results reveal that the composite exhibits spherical particles with the particle size of 0. 5-3 μm. Electrochemical tests show that the 3Li4Ti5O12·Ni O composite material has much better rate and cycling performances than the single Li4Ti5O12. The composite shows the specific discharge capacities of 372. 8 m Ah·g^- 1,252. 6 m Ah·g^- 1and 204. 8 m Ah·g- 1at 0. 1 C,1 C and 20 C rates,respectively. After 300 cycles,the specific discharge capacity retention ration is 98. 7% at 20 C rate.