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Lithium vanadium phosphate and preparation method thereof

A lithium vanadium phosphate, lithium source technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of uneven dispersion, poor electrochemical performance of lithium vanadium phosphate, etc., and achieve the effect of improving purity and quality

Active Publication Date: 2018-07-17
SHENZHEN DYNANONIC
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  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of lithium vanadium phosphate and preparation method thereof, aim at solving lithium vanadium phosphate prepared by existing method, lithium source, vanadium source, phosphorus source etc. disperse inhomogeneously, cause the prepared lithium vanadium phosphate electrochemical poor performance problem

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  • Lithium vanadium phosphate and preparation method thereof
  • Lithium vanadium phosphate and preparation method thereof
  • Lithium vanadium phosphate and preparation method thereof

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preparation example Construction

[0030] The embodiment of the present invention provides a kind of preparation method of lithium vanadium phosphate, comprises the following steps:

[0031] S01. Provide a lithium source, a vanadium source, and a phosphorus source, first dissolve the lithium source in an inorganic acid, then add the vanadium source, phosphorus source, and a complexing agent to mix, and react at a temperature lower than 100°C to obtain Precursor solution;

[0032] S02. vacuum-drying the precursor solution at a temperature lower than 0° C. to obtain a lithium vanadium phosphate precursor;

[0033] S03. The lithium vanadium phosphate precursor is sequentially subjected to a first sintering treatment and a second sintering treatment to obtain lithium vanadium phosphate, wherein the second sintering treatment is performed in an inert atmosphere.

[0034] The preparation method of lithium vanadium phosphate provided by the embodiments of the present invention has the following advantages:

[0035] ...

Embodiment 1

[0053] A preparation method for lithium vanadium phosphate, comprising the following steps:

[0054] Weigh lithium hydroxide and dissolve it in nitric acid, then add vanadium pentoxide, diammonium hydrogen phosphate and citric acid, (lithium source: vanadium source: phosphorus source is 1.08:1:1) and stir at a temperature of 70°C. Perform vacuum drying at low temperature (-40°C) to obtain a lithium vanadium phosphate precursor. The lithium vanadium phosphate precursor is pre-sintered. First, the temperature is raised to 350°C at a rate of 5°C / min, and sintered for 4 hours. 10h.

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Abstract

The invention provides a preparation method of lithium vanadium phosphate. The method comprises the following steps that a lithium source, a vanadium source and a phosphate source are provided, the lithium source is dissolved into inorganic acid, then the vanadium source, the phosphate source and a complex agent are added for mixing, a reaction is conducted on the condition that the temperature islower than 0 DEG C, and a precursor solution is obtained; the precursor solution is subjected to vacuum drying treatment on the condition that the temperature is lower than 0 DEG C, and a lithium vanadium phosphate precursor is obtained; the lithium vanadium phosphate precursor is subjected to first sintering and second sintering in sequence, and the lithium vanadium phosphate is obtained, wherein second sintering is conducted in an inert atmosphere.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to lithium vanadium phosphate and a preparation method thereof. Background technique [0002] In recent years, lithium vanadium phosphate has attracted widespread attention due to its high lithium ion diffusion efficiency, high discharge capacity and energy density, and good cycle performance and thermal stability. In addition, lithium vanadium phosphate has a three-dimensional lithium ion diffusion channel, and compared with lithium iron phosphate with the same one-dimensional ion diffusion channel, the rate performance is significantly improved. Therefore, lithium vanadium phosphate material is one of the preferred positive electrode materials for the development of lithium-ion power batteries with high energy density, high rate performance and good safety performance. [0003] Studies have shown that particle morphology has a huge impact on the performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58
CPCC01B25/45C01P2006/40H01M4/5825Y02E60/10
Inventor 孔令涌陈玲震胡晓宁
Owner SHENZHEN DYNANONIC
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