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Iron phosphate as well as preparation method and application thereof

A technology of iron phosphate and hydrated iron phosphate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of poor electrochemical performance of lithium iron phosphate and low tap density of iron phosphate

Active Publication Date: 2021-06-18
CHANGSHA UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The tap density of the ferric phosphate prepared by the above method is low, only 0.9g / cm 3 , the electrochemical performance of the cathode material lithium iron phosphate synthesized from this raw material is poor

Method used

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  • Iron phosphate as well as preparation method and application thereof
  • Iron phosphate as well as preparation method and application thereof

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preparation example Construction

[0025] The present invention provides a method of preparation of iron phosphates, including the following steps:

[0026] (1) The iron salt is mixed with the polyurono compound under acidic conditions to obtain a first mixed solution;

[0027] (2) Mix the phosphorus source, polyhydroxyol with water to obtain a second mixed solution;

[0028] (3) The first mixing solution obtained by the step (1) is mixed with the second mixed solution obtained by the step (2) to carry out a hydrate-free phosphate;

[0029] (4) Calcination of the hydrated phosphonate obtained by the step (3) is calcined to give iron phosphate;

[0030] The steps (1) and step (2) have no order.

[0031] The present invention mixed with a ferric salt with a polyurono compound under acidic conditions to obtain a first mixed solution.

[0032] In the present invention, the iron salt preferably comprises iron sulfate or nitrate; the polyurono compound preferably comprises at least one of ethylenediamine and prophylamine...

Embodiment 1

[0058] (1) 1 mol of iron sulfate was mixed with a sulfuric acid solution, and 21 mol ethylenediamine was added under a pH of 2 and 200 rpm, and 21 mol ethylenediamine was added to obtain a first mixed solution;

[0059] (2) 3 mol of phosphoric acid is dissolved in 1L deionized water to a transparent solution; 7 mol of polyvinyl alcohol is dissolved in 1 L 80 ° C deionized water to obtain a mixed solution; then the mixed solution is 200 revolutions / min stirring conditions. Next, in the transparent solution, a second mixed solution is obtained; wherein the mass ratio of polyvinyl alcohol and 80 ° C deionized water is 1: 3;

[0060] (3) The second mixed solution is added dropwise to the first mixed solution under a mixture of 50 ml / min, a hydrothermal reaction in a 5L stainless steel reaction kettle under a stirring condition of 50 ml / min. After completion, cooling, filtration and washing were sequentially, and the iron hydrated phosphate was obtained; wherein the temperature o...

Embodiment 2

[0065] (1) 1 mol of iron sulfate was mixed with a sulfuric acid solution, and then 21 mol may be added under stirring at a pH of 1 and 200 revolutions / min, and the first mixed solution was obtained.

[0066] (2) 3 mol of phosphoric acid is dissolved in 1L deionized water to a transparent solution; 7 mol of polyvinyl alcohol is dissolved in 1 L 80 ° C deionized water to obtain a mixed solution; then the mixed solution is 200 revolutions / min stirring conditions. Next, in the transparent solution, a second mixed solution is obtained; wherein the mass ratio of polyvinyl alcohol and 80 ° C deionized water is 1: 3;

[0067] (3) The second mixed solution is added dropwise to the first mixed solution under a mixture of 50 ml / min, a hydrothermal reaction in a 5L stainless steel reaction kettle under a stirring condition of 50 ml / min. After completion, cooling, filtration and washing were sequentially, and the iron hydrated phosphate was obtained; wherein the temperature of the hydr...

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Abstract

The invention provides a preparation method of ferric phosphate, which comprises the following steps: mixing ferric salt with a polyamino compound under an acidic condition to obtain a first mixed solution; mixing a phosphorus source, polyhydroxy alcohol and water to obtain a second mixed solution; mixing the first mixed solution with the second mixed solution, and carrying out hydrothermal reaction to obtain hydrated iron phosphate; and calcining the hydrated iron phosphate to obtain the iron phosphate. According to the preparation method, the multi-amino compound is used for complexing iron ions in the iron salt, iron phosphate is induced to directionally grow into a nanosheet-shaped structural element, and amino groups are released; a polyamino compound is used for transporting an iron phosphate nano-structure element to be combined with polyhydroxy alcohol for bridging, and iron phosphate with a radial ordered multi-pore-channel structure is prepared by adopting a hydrothermal method, so that a lithium source infiltration channel is remarkably increased, the resistance of ions migrating to a material center in a high-temperature solid-phase reaction process is reduced, and therefore, the electrochemical performance of the lithium iron phosphate is improved.

Description

Technical field [0001] The present invention belongs to the technical field of lithium ion battery materials, and is specifically involved in iron phosphate and preparation methods and applications thereof. Background technique [0002] Lithium-ion batteries are a new generation of green high energy batteries, with high operating voltage, large energy density, good cycle performance, high quality and non-pollution, widely used in mobile phones, laptops, electronic instruments and weapons and equipment. The positive electrode material is one of the core parts of the lithium ion battery, and its performance is the key to improving the performance of lithium ion battery. At present, the positive electrode material for lithium ion batteries is mainly coco cobalt oxide (Licoo) 2 ), Lithium manganate (LiMn 2 O 4 ) And lithium iron phosphate (LiFepo 4 ) Mainly, there is a LifePo with an olivine structure 4 Due to the advantages of low price, rich raw materials, good thermal stability, g...

Claims

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Application Information

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IPC IPC(8): C01B25/37H01M4/58H01M10/0525
CPCC01B25/375C01P2002/72C01P2004/03C01P2004/32C01P2004/61H01M4/5825H01M10/0525Y02E60/10
Inventor 陈晗周伟向楷雄张世英丁建华方蕾蕾
Owner CHANGSHA UNIVERSITY