Preparation and electrochemical properties of Cr-doped Li9V3(P2O7)3(PO4)2 as cathode materials for lithium-ion batteries |
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| Authors: | Jiantie Xu Yanming Zhao Quan Kuang Youzhong Dong |
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| Affiliation: | aSchool of Material Science and Engineering, South China University of Technology, Guangzhou 510640, China;bSchool of Physics, South China University of Technology, Guangzhou 510640, China |
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| Abstract: | Cr-doped Li9V3−xCrx(P2O7)3(PO4)2 (x = 0.0–0.5) compounds have been prepared using sol–gel method. The Rietveld refinement results indicate that single-phase Li9V3−xCrx(P2O7)3(PO4)2 (x = 0.0–0.5) with trigonal structure can be obtained. Although the initial specific capacity decreased with Cr content at a lower current rate, both cycle performance and rate capability have excited improvement with moderate Cr-doping content. Li9V2.8Cr0.2(P2O7)3(PO4)2 compound presents the good electrochemical rate and cyclic ability. The enhancement of rate and cyclic capability may be attributed to the optimizing particle size, morphologies, and structural stability during the proper amount of Cr-doping (x = 0.2) in V sites. |
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| Keywords: | Lithium ion battery Cathode material Sol&ndash gel Li9V3&minus xCrx(P2O7)3(PO4)2 |
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