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采用控制pH值为4的溶胶-凝胶法制备Li_3V_2(PO_4)_3/C正极材料,采用聚乙烯醇辅助的悬浮包覆法对其进行不同含量的CeO_2包覆,研究了C和CeO_2共包覆制备工艺在常温、0℃和-20℃对Li_3V_2(PO_4)_3电化学性能的影响。结果表明,CeO_2包覆是提高Li_3V_2(PO_4)_3/C低温电化学性能的一种有效方法,在3.0~4.8 V电压窗口下CeO_2包覆量为2%(质量分数)时,材料具有最好的电化学性能,适量的CeO_2包覆可以提高材料的锂离子扩散系数并降低材料的电荷转移电阻。
The Li_3V_2 (PO_4) _3 / C cathode material was prepared by sol-gel method at a controlled pH value of 4, and coated with different amounts of CeO_2 by polyvinylalcohol-assisted suspension coating. The effect of C and CeO_2 co-inclusion Effect of Preparation Process on Electrochemical Properties of Li_3V_2 (PO_4) _3 at Room Temperature, 0 ℃ and -20 ℃. The results show that CeO_2 coating is an effective method to improve the low temperature electrochemical performance of Li_3V_2 (PO_4) _3 / C. When CeO_2 is applied at a voltage of 3.0-4.8 V, the material has the best coverage of 2% (mass fraction) The electrochemical performance of CeO_2 can increase the lithium ion diffusion coefficient and decrease the charge transfer resistance of the material.