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《The Chinese Journal of Process Engineering》 2019-03
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Research progress in doping of lithium vanadium phosphate cathode materials

Hulin DONG;Haiping BAO;Hao WANG;Jianhong PENG;College of Physics and Electronic Information Engineering, Qinghai University of Nationalities;College of Materials Science and Engineering, Beijing University of Technology;  
A new clean-energy is urgently needed to replace the traditional clean-energy(such as solar energy, tidal energy, and wind energy) with the problem of low conversion efficiency and more difficult energy storage in the face of the rigorous energy and environmental problems. The lithium ion battery is favored by researchers because of its green environmental protection, good safety performance, high discharge capacity, long cycle life and easy to carry,especially Li3 V2(PO4)3(LVP) lithium-ion battery. The LVP is one of the cathode materials of Li-ion batteries attracted most attention due to its higher discharge capacity, higher voltage platform, good safety performance, portability,environmental protection and low cost. However, the instinct drawbacks of monoclinic structure lead to low ionic conductivity and electronic conductivity, which seriously degrade the electrochemical properties of the materials. At present, among the various modified methods, ions doping is one of the most effective ways. The ions doping can optimize the lattice parameters of LVP, enhance the stability of the crystal structure in the process of charging and discharging, and improve the cycle life. In addition, it can also increase the ionic diffusion coefficient and perfect the ionic conductivity via enlarging interstitial void and diffusion path of ions. In present studies, the ions doping of LVP mainly includes doping in Li sites, doping in V sites, anion doping and multibit doping. Meanwhile, the doping in V sites of LVP also includes single doping and co-doping. In this work research processes of ions doping for enhancing the electrochemical performance of Li3 V2(PO4)3 were summarized and the development prospect of this material was also reviewed.
【Fund】: 教育部春晖计划资助项目(编号:Z2014012);; 青海民族大学“纳米材料与技术”科研创新团队建设经费资助项目
【CateGory Index】: TM912
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