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Lithium vanadium phosphate and preparation method thereof

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

Active Publication Date: 2020-01-17
SHENZHEN DYNANONIC
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  • Abstract
  • Description
  • Claims
  • 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 method for preparing lithium vanadium phosphate, which includes the following steps:

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

[0032] S02. The precursor solution is vacuum dried under conditions below 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 embodiment of the present invention has the following advantages:

[0035] First of all, on the one hand, the use...

Embodiment 1

[0053] A preparation method of lithium vanadium phosphate includes 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 70℃. Carry out low-temperature (-40°C) vacuum drying to obtain a lithium vanadium phosphate precursor. The lithium vanadium phosphate precursor is pre-sintered, and the temperature is raised to 350°C at a rate of 5°C / min, and sintered for 4 hours. The reaction chamber is replaced with nitrogen gas, and then the temperature is raised to 800°C at a rate of 10°C / min. 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 particularly relates to a lithium vanadium phosphate and a preparation method thereof. Background technique [0002] In recent years, lithium vanadium phosphate has received 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. 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 cathode 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 the particle morphology has a huge impact on the performance of lithium van...

Claims

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Application Information

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Patent Type & Authority Patents(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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