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Preparation method of anhydrous iron phosphate and preparation method of lithium iron phosphate carbon composite material

A technology of carbon composite materials and anhydrous phosphoric acid, applied in the direction of phosphorus compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of large primary particles, unclear primary particle boundaries, unfavorable processing of lithium iron phosphate, etc., to achieve optimized crystal The degree of melting, good coating effect, and the effect of reducing sanding time

Pending Publication Date: 2022-07-22
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, from the perspective of product particles, the boundary of primary particles is not clear, and the overall primary particles are relatively large, which is not conducive to the subsequent processing of lithium iron phosphate

Method used

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  • Preparation method of anhydrous iron phosphate and preparation method of lithium iron phosphate carbon composite material

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Embodiment 1

[0041] The present embodiment provides a preparation method of anhydrous iron phosphate, comprising the following steps:

[0042] 1) At normal temperature, dissolving the titanium dioxide by-product in deionized water and diluting, removing impurities, filtering, removing the filter cake, leaving the clear liquid, and configuring the iron ion concentration to be 3%;

[0043] 2) Configure phosphate dripping solution: take 1mol iron as a reference, first dissolve APP (nitrogen-phosphorus binary compound fertilizer) in deionized water containing phosphoric acid for hydrolysis, pay attention to controlling the water temperature at 30 °C, APP:phosphoric acid: go The ratio of ionized water is controlled within 4:1:50, PO4 3- :1mol;

[0044] 3) On the basis of step 2, add phosphoric acid, hydrogen peroxide again, add ammonia water after cooling, NH 3 The number of moles is in 1mol, H 2 O 2 The number of moles in 0.3mol. NH 4 + with PO 4 3- The ratio of phosphate solution is ...

Embodiment 2

[0049] The present embodiment provides a preparation method of anhydrous iron phosphate, comprising the following steps:

[0050] 1) At normal temperature, the titanium dioxide by-product is dissolved in deionized water to dilute, remove impurities, filter, remove the filter cake, leave the clear liquid, and configure the iron ion concentration at 4%;

[0051] 2) Configure phosphate dripping solution: take 1mol iron as a reference, first dissolve APP (nitrogen-phosphorus binary compound fertilizer) in deionized water containing phosphoric acid for hydrolysis, pay attention to control the water temperature at 35°C, APP:phosphoric acid: go to The ratio of ionized water is controlled within 4:1:50, PO4 3- :1.2mol;

[0052] 3) On the basis of step 2, add phosphoric acid, hydrogen peroxide again, add ammonia water after cooling, NH 3 The number of moles is 1.5mol, H 2 O 2 The number of moles in 0.5mol, NH 4 + with PO 4 3- The ratio of phosphate solution is controlled within...

Embodiment 3

[0056] The present embodiment provides a preparation method of anhydrous iron phosphate, comprising the following steps:

[0057] 1) At normal temperature, the titanium dioxide by-product is dissolved in deionized water to dilute, remove impurities, filter, remove the filter cake, leave the clear liquid, and configure the iron ion concentration at 5%;

[0058] 2) Configure phosphate dripping solution: take 1mol iron as a reference, first dissolve APP (nitrogen-phosphorus binary compound fertilizer) in deionized water containing phosphoric acid for hydrolysis, pay attention to controlling the water temperature at 40 °C, APP:phosphoric acid: go The ratio of ionized water is controlled within 4:1:50, PO4 3- :1.5mol;

[0059] 3) On the basis of step 2, add phosphoric acid, hydrogen peroxide again, add ammonia water after cooling, NH 3 The number of moles is 2mol, H 2 O 2 The number of moles in 1mol. NH 4 + with PO 4 3- The ratio of phosphate solution is controlled within ...

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Abstract

The invention discloses a preparation method of anhydrous iron phosphate and a preparation method of a lithium iron phosphate carbon composite material, a green vanadium product is purified from titanium dioxide to synthesize an iron phosphate product, and APP is utilized to replace DAP or MAP, so that on one hand, the cost can be reduced to a certain extent, and on the other hand, the pollution can be reduced. In addition, a two-step aging mode or a multi-step aging mode is controlled, and the dehydration temperature and time are adjusted, so that primary particles of iron phosphate can be controlled at a relatively small level of about 100nm, and meanwhile, a relatively normal Fe / P ratio is obtained. The lithium iron phosphate carbon composite material is prepared by adopting the anhydrous iron phosphate, and composite carbon source and composite carbon coating is performed by a rheological phase method, so that the sintering temperature can be reduced, the sanding and sintering time can be shortened, the coating uniformity can be improved, and meanwhile, the electrical property, especially the rate capability, of lithium iron phosphate can be enhanced.

Description

technical field [0001] The invention belongs to the field of new energy battery materials, relates to the preparation of iron phosphate and lithium iron phosphate carbon composite materials, and in particular relates to a preparation method of anhydrous iron phosphate and lithium iron phosphate carbon composite materials that reduce costs and improve material power characteristics method. Background technique [0002] Iron phosphate, also known as high iron phosphate, iron orthophosphate, molecular formula FePO4, is a white, gray-white monoclinic crystal powder. It is a salt of iron salt solution and sodium phosphate, in which iron is positive trivalent. Its main purpose is to manufacture lithium iron phosphate battery materials, catalysts and ceramics. [0003] The color of high-purity ferric phosphate dihydrate is nearly white or light (light) yellow-white powder. With the loss of crystal water, the color gradually turns yellow, and the pure anhydrous is yellow-white pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37C01B25/45H01M4/58H01M4/62
CPCC01B25/375C01B25/45H01M4/5825H01M4/625C01P2006/11C01P2004/61C01P2004/30C01P2004/80C01P2004/62C01P2006/40
Inventor 沈书敏
Owner WANXIANG 123 CO LTD
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