| 单斜Li3V2(PO4)3/C复合材料的制备及其电化学性能 |
| Preparation and Electrochemical Properties of Monoclinic Li3V2(PO4)3/C Composites |
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| 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 Li3V2(PO4)3 软化学法 电化学性能 |
| 基金项目: |
| Abstract: The cathode material Li3V2(PO4)3/C was synthesized by a novel soft chemistry method with LiOH·H2O, V2O5, H3PO4 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 Li3V2(PO4)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: lithium-ion battery Li3V2(PO4)3 soft chemistry method electrochemical properties |
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| 摘要点击次数: 1411 |
| 全文下载次数: 2023 |
| 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. |
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