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| 单斜Li3V2(PO4)3/C复合材料的制备及其电化学性能 | |
| 引用本文： | 艾邓均,刘维芳,唐安平,段 浩,刘开宇.单斜Li3V2(PO4)3/C复合材料的制备及其电化学性能[J].无机化学学报,2009,25(10):1717-1723. |
| 作者姓名： | 艾邓均 刘维芳 唐安平 段 浩 刘开宇 |
| 作者单位： | 1. 中南大学化学化工学院,长沙,410083 2. 中南大学材料科学与工程学院,长沙,410083 3. 湖南科技大学化学化工学院,湘潭,411201 |
| 基金项目： | 湖南省科技计划重点项目 |
| 摘 要： | 以LiOH·H2O、V2O5、H3PO4和蔗糖为原料,采用软化学法制备了锂离子电池正极材料Li3V2(PO4)3/C.通过X射线衍射(XRD)、扫描电镜(SEM)对产物的结构和形貌进行表征,采用恒电流充放电、电化学阻抗考察了产物的电化学性能.结果表明.当煅烧温度达到700℃时,杂质相衍射峰消失,所得的样品为纯相的单斜Li3V2(PO4)3.颗粒粒度为1～2 μm;在3.0～4.5 V电压范围内以0.2C倍率充放电,首次放电比容量达到148.2 mAh·g-1,第50次循环比容量仍为144 mAh·g-1,容量保持率为97%,具有良好的循环性能;另外,样品还具有很好的倍率性能和高温性能. |
| 关 键 词： | 锂离子电池 软化学法 电化学性能 |
Preparation and Electrochemical Properties of Monoclinic Li3V2(PO4)3/C Composites |
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| AI Deng-Jun,LIU Wei-Fang,TANG An-Ping,DUAN Hao and LIU Kai-Yu.Preparation and Electrochemical Properties of Monoclinic Li3V2(PO4)3/C Composites[J].Chinese Journal of Inorganic Chemistry,2009,25(10):1717-1723. | |
| Authors: | AI Deng-Jun LIU Wei-Fang TANG An-Ping DUAN Hao and LIU Kai-Yu |
| Institution: | School of Chemistry and Chemical Engineering, Central South University, Changsha 410083,School of Materials Science and Engineering, Central South University, Changsha 410083,School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201,School of Chemistry and Chemical Engineering, Central South University, Changsha 410083 and School of Chemistry and Chemical Engineering, Central South University, Changsha 410083 |
| Abstract: | The cathode material Li_3V_2(PO_4)_3/C was synthesized by a novel soft chemistry method with LiOH·H_2O, V_2O_5, H_3PO_4 and sucrose as the raw materials. The structure and morphology of products were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) measurements, electrochemical properties of samples were investigated by constant current charge-discharge and electrochemical impedence spectroscopy (EIS). The results showed that the sample synthesized at 700 ℃ was pure monoclinic Li_3V_2(PO_4)_3 with a particle size of 1～2 μm; and it exhibited an initial discharge capacity of 148.2 mAh·g~(-1) under 0.2C rate in the voltage of 3.0～4.5 V, which remained 144 mAh·g~(-1) in the 50th cycle with a capacity retention of 97%, indicating good cycling performance; in addition, the sample had better rate and high temperature performance. |
| Keywords: | Li3V2(PO4)3 |
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