Structural and electrochemical characterization of vanadium-excess Li3V2(PO4)(3)-LiVOPO4/C composite cathode material synthesized by sol-gel method
文献类型：期刊论文
| 作者 | Ahsan, Zishan; Cai, Zhenfei; Wang, Shuai; Ma, Yangzhou; Song, Guangsheng; Yu, Mo; Zhang, Shihong; Yang, Weidong; Wen, Cuie; Feng, Xiaohua |
| 刊名 | JOURNAL OF SOLID STATE ELECTROCHEMISTRY
 |
| 出版日期 | 2021 |
| 卷号 | 25期号:7页码:2127-2137 |
| 关键词 | PERFORMANCE LIVOPO4 LI3-3XV2+X(PO4)(3)/C NANOCOMPOSITES TRANSFORMATION BETA-LIVOPO4 TEMPERATURE INTERFACE BATTERIES |
| 英文摘要 | To improve capacity and electrochemical performance of the cathode of Li-ion batteries, non-stoichiometric, vanadium-excess (V-excess) Li3V2 (PO4)(3)-LiVOPO4/C (LVP-LVOP/C) composite cathode materials are synthesized by a single-step citric acid assisted sol-gel method and sintered at temperatures (300-900 degrees C). X-ray diffraction and transmission electron microscope results indicate that major Li3V2(PO4)(3) and minor LiVOPO4 phases coexist and X-ray photoelectron spectroscopy results also show that the valance state of vanadium is +4 and + 3. The sample sintered at 800 degrees C shows the best electrochemical performance with the highest discharge capacity of 140 mAh g(-1) at 0.2 C, higher than the theoretical capacity of Li3V2(PO4)(3) in the voltage range 2.8-4.3 V. The composite material displays remarkably improved stability exhibiting reversible capacity of 130, 115, and 108 mAh g(-1) after 300, 500, and 1000 cycles at the rate of 0.3 C, 0.5 C, and 1 C, respectively. Additionally, the composite LVP-LVOP/C shows superior rate performance at various current densities from 0.2 to 10 C. Our study reveals that the novel composite material considerably enhances electrochemical performance, electronic conductivity, Liion diffusion, and contribution of LiVOPO4 to capacity by accommodating extra Li-ions to enhance capacity. The results demonstrate that the study is highly promising for the development of V-excess cathodes as V-excess composite materials exhibit better performance than pure phase Li3V2(PO4)(3). |
| 源URL | [http://ir.nimte.ac.cn/handle/174433/21843]  |
| 专题 | 中国科学院宁波材料技术与工程研究所 2021专题_期刊论文 |
| 作者单位 | 1.Song, GS (corresponding author), Anhui Univ Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Green Fabricat & Surface Technol Adv Met, Maanshan 243000, Peoples R China. 2.Ma, YZ |
| 推荐引用方式 GB/T 7714 | Ahsan, Zishan,Cai, Zhenfei,Wang, Shuai,et al. Structural and electrochemical characterization of vanadium-excess Li3V2(PO4)(3)-LiVOPO4/C composite cathode material synthesized by sol-gel method[J]. JOURNAL OF SOLID STATE ELECTROCHEMISTRY,2021,25(7):2127-2137. |
| APA | Ahsan, Zishan.,Cai, Zhenfei.,Wang, Shuai.,Ma, Yangzhou.,Song, Guangsheng.,...&Feng, Xiaohua.(2021).Structural and electrochemical characterization of vanadium-excess Li3V2(PO4)(3)-LiVOPO4/C composite cathode material synthesized by sol-gel method.JOURNAL OF SOLID STATE ELECTROCHEMISTRY,25(7),2127-2137. |
| MLA | Ahsan, Zishan,et al."Structural and electrochemical characterization of vanadium-excess Li3V2(PO4)(3)-LiVOPO4/C composite cathode material synthesized by sol-gel method".JOURNAL OF SOLID STATE ELECTROCHEMISTRY 25.7(2021):2127-2137. |
入库方式： OAI收割
来源：宁波材料技术与工程研究所
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