文献类型：期刊文献

中文题名：Li_3VO_4/RGO纳米复合负极材料的制备及其电化学性能

英文题名：Preparation and Electrochemical Performance of Li_3VO_4/Reduced Graphene Oxide Nanocomposite Anode Material

作者：谢飞[1];胡彦杰[1];李云峰[1];江浩[1];李春忠[1]

机构：[1]华东理工大学超细材料制备与应用教育部重点实验室,上海200237

年份：2018

卷号：44

期号：1

起止页码：55

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD_E2017_2018】；

基金：国家自然科学基金(91534122;21506125;91534202);上海市基础研究重点项目(14JC1490700;15JC1401300)

语种：中文

中文关键词：锂离子电池;负极材料;钒酸锂;还原氧化石墨烯

外文关键词：Li-ion battery;anode material; Li3VO4 ; reduced graphene oxide

摘要：钒酸锂作为锂离子电池负极材料,因具有比碳材料更高的安全性能和比钛酸锂材料更高的能量密度,成为近年来的研究热点,但导电性能差是限制其应用的主要瓶颈。为了改善钒酸锂材料的导电性,提高其比容量和倍率性能,设计构筑了具有三维结构的Li_3VO_4/RGO(还原氧化石墨烯)复合负极材料。结果表明,RGO可以抑制Li_3VO_4颗粒的团聚,典型产物中Li_3VO_4颗粒粒径为50~200nm,均匀地分散在RGO的表面,与RGO形成良好的三维网络结构。600℃煅烧后的样品(Li_3VO_4/RGO-600)在0.5C的电流密度下首次放电比容量达到495.6(mA·h)/g,100次循环后保有365.9(mA·h)/g;在10C的电流密度下,放电比容量仍可保持332.9(mA·h)/g。
The development of lithium-ion batteries （LIBs） possessing the satisfactory capacity and energy density is critical for many new energy applications, such as portable electronics and electric vehicles （EVs）. Although the current LIBs have demonstrated substantial success in widespread applications and commercialization, challenges still exist in situations that require high rate charge/ discharge processes and have high risk in serving as power resource of EVs and hybrid EVs. Commercial anode materials have been dominated by graphite for nearly 20 years, however, owing to the low working voltage of graphite （0.2 V vs. Li＋ /Li）, they suffer from potential safety issues of dendritic lithium formation and side reactions caused by the solid electrolyte interphase （SEI） layer on its surface. Hence, a new anode material with appropriate working voltage and high energy density simultaneously will be desirable. Li3V 04 （LVO） has been known as an excellent ion conduction material and optical material for many years, and it has demonstrated great potential as anode material of LIBs as well. Compared to Li4Ti5012 and graphite, LVO, an intercalation type material, has an appropriate and safe working voltage range （0. 5-1. 0 V vs. Li＋/ Li ） ,which prevents the high risk of graphite and the sacrifice of energy density and overall battery voltage. Meanwhile, LVO experiences small volume change during lithiation/delithiation process and possesses a relatively high theoretical capacity of 400 （mA · h）/g, corresponding to two lithium ions intercalated in LVO and shifted to Li3＋x VO4 （x= 2）. Nonetheless, the practical use of LVO still faces an obstacle, the low electrical conductivity. In this paper, in order to improve its capacity and rate performance, Li3V04/RG0 nanocomposites with three-dimension network structures were successfully prepared by drying method. The primary Li3 V04 particle’s diameter is about 50-200 nm and dispersed on the surfaces of RGO nanosheets uniformly. After calcination at temperature of 600 ℃ , the typical samples showed excellent electrochemical performance. Li3 VO4/RGO-600 electrode achieved a high discharge specific capacity of 495. 6 （mA · h）/g at 0. 5 C and maintained 365. 9 （mA · h）/g after 100 cycles; Even at a high current density of 10 C, it still delivered a superior capacity of 332. 9 （mA · h） /g.