Synthesis and characterization of LiVOPO4/V2O5 composite cathode for lithium ion batteries

被引：6
|
作者：
Fu, Yangyang [1 ]
Tang, Anping [1 ,2 ,3 ]
Chen, Hezhang [1 ]
Xu, Guorong [1 ]
Song, Haishen [1 ]
Peng, Ronghua [1 ]
机构：
[1] Hunan Univ Sci & Technol, Sch Chem & Chem Engn, Xiangtan 411201, Peoples R China
[2] Hunan Prov Key Lab Adv Mat New Energy Storage & C, Xiangtan 411201, Peoples R China
[3] Hunan Univ Sci & Technol, Key Lab Theoret Chem & Mol Simulat, Minist Educ, Xiangtan 411201, Peoples R China
来源：
IONICS | 2020年 / 26卷 / 04期
关键词：
LiVOPO4; Cathode; Lithium ion batteries; Modification with V2O5; ELECTROCHEMICAL PERFORMANCE; BETA-LIVOPO4;
D O I：
10.1007/s11581-020-03499-4
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
LiVOPO4/V2O5 composites were prepared by a hydrothermal oxidation route and subsequent heat-treatment. The existence of V2O5 in the composites was confirmed using X-ray diffraction. The morphologies of the samples were observed by scanning electron microscopy. The effects of V2O5 content on the electrochemical properties of the composites were investigated by galvanostatic charge-discharge tests and electrochemical impedance spectroscopy. X-ray diffraction revealed that modification with V2O5 did not change LiVOPO4 crystal structure. V2O5-modified LiVOPO4 composites displayed improved discharge specific capacities in comparison with the pristine LiVOPO4 sample. Among the investigated composites, the one with 15 wt% V2O5 showed the best electrochemical performance, which might be contributed to a significant decrease in the interfacial resistance by modification with V2O5.
引用
收藏
页码：1629 / 1634
页数：6
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