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采用控制pH值为4的溶胶-凝胶法制备Li_3V2(PO4)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CeO2包覆,研究了C和CeO2共包覆制备工艺在常温、0℃和-20℃对Li_3V2(PO4)3电化学性能的影响。结果表明,CeO2包覆是提高Li_3V2(PO4)3/C低温电化学性能的一种有效方法,在3.04.8 V电压窗口下CeO2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CeO2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。
Abstract：Li_3V2(PO4)3/C powders were synthesized by an improved sol-gel method,and subsequently the powders were coated with various amounts of CeO2 by a suspension coating process in polyvinyl alcohol.The electrochemical properties of the samples at various temperatures(i.e.,room temperature,0 ℃ and-20 ℃) were characterized.The results show that the surface modification with CeO2 is an effective way to improve the electrochemical performance of Li_3V2(PO4)3 cathode materials at low temperatures.The Li_3V2(PO4)3/C coated with CeO2 of 2%(in mass fraction) exhibits the superior electrochemical performance in the voltage range of3.0-4.8 V.The coating with an appropriate amount of CeO2 can improve the diffusion coefficients of lithium ion and reduce the charge transfer resistance.
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基本信息:
DOI：10.14062/j.issn.0454-5648.2016.01.02
中图分类号:TB33;TM912
引用信息:
[1]江虹,徐江海,郭瑞松,等.CeO_2与碳共包覆Li_3V_2(PO_4)_3正极材料低温电化学性能[J].硅酸盐学报,2016,44(01):6-12.DOI:10.14062/j.issn.0454-5648.2016.01.02.
基金信息:
贵州省省校科技合作计划项目([2014]7003)
2015-12-23
2015-12-23
2015-12-23