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Synthesis and characterization of triclinic structural LiVPO_4F as possible 4.2 V cathode materials for lithium ion batteries

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Journal of Central South University of Technology 2007年第3期14卷 340-343页

作者：钟胜奎尹周澜王志兴陈启元 School of Chemistry and Chemical Engineering Central South University Department of Materials and Chemistry Guilin University of Technology Guilin 541004 China School of Metallurgical Science and Engineering Central South University

A potential 4.2 V cathode material LiVPO4F for lithium batteries was prepared by two-step reaction method based on a carbon-thermal reduction （CTR） process. Firstly, V2O5, NH4H2PO4 and acetylene black are reacted under an Ar atmosphere to yield VPO4. The transition-metal reduction is facilitated by the CTR based on C→CO transition. These CTR conditions favor stabilization of the vanadium as V^3＋ as well as leaving residual carbon, which is useful in the subsequent electrode processing. Secondly, VPO4 reacts with ElF to yield LiVPO4F product. The property of the LiVPO4F was investigated by X-ray diffractometry （XRD）, scanning electron microscopy （SEM） and electrochemical measurement. XRD studies show that LiVPO4F synthesized has triclinic structure（space group p I ）, isostructural with the naturally occurring mineral tavorite, EiFePO4-OH. SEM image exhibits that the particle size is about 2μm together with homogenous distribution. Electrochemical test shows that the initial discharge capacity of LiVPO4F powder is 119 mA·h/g at the rate of 0.2C with an average discharge voltage of 4.2V （vs Ei/Li^＋）, and the capacity retains 89 mA·h/g after 30 cycles.

关键词： lithium ion batteries cathode material LiVPO4F carbon-thermal reduction method

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Synthesis and Electrochemical Properties of Lithium Vanadium Fluorophosphates, LiVPO4F

Synthesis and Electrochemical Properties of Lithium Vanadium...

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2006年全国冶金物理化学学术会议

作者：钟胜奎尹周澜王志兴郭华军李新海 College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China Department of Material and ChemistryGuilin University of TechnologyGuilin541004China School of Metallurgical Science and Engineering Central South UniversityChangsha410083China School of Metallurgical Science and Engineering Central South UniversityChangsha410083China School of Metallurgical Science and Engineering Central South UniversityChangsha410083China

＜正＞The electroactive lithium vanadium fluorophosphates,LiVPO4F has been synthesized by a two-step reaction scheme based on a carbothermal reduction（CTR）process. In the first CTR step, V2O5, （NH4）2HPO4 and C were reacted under an inert atmosphere to yield VPO4. In the second step , the CTR VPO4 was reacted with LiF to yield the LiVPO4F. The property of the LiVPO4F was investigated by X-ray diffraction （XRD） patterns, scanning electron microscopic （SEM） images and electrochemical measurement. XRD studies showed that LiVPO4F synthesized has triclinic structure（space group p1）,isostructural with the naturally occurring mineral tavorite. ***. SEM images exhibited that the particle size of the LiVPO4F powders synthesized is about 2.5μm. Electrochemical test showed that the initial discharge capacity of LiVPO4F powder was 131mAh g-1 at the rate of 0.1C with an average discharge voltage of 4.2V （***/Li+）.

关键词： lithium ion batteries cathode material LiVPO4F carbon-thermal reduction method

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