Microcrystalline-structure metal phosphate and preparation method thereof

A technology of metal phosphate and microcrystalline structure, which is applied in structural parts, electrical components, battery electrodes, etc., can solve the problem of destroying the crystal structure of lithium iron phosphate olivine, reducing compaction density, battery energy density, and the impact of cycle life of multiples, etc. problems, to achieve good rate cycle life, reasonable tap density, and high energy density

Inactive Publication Date: 2018-01-19
江苏亨利锂电新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although the research and production of battery-grade iron orthophosphate at home and abroad started relatively late, they all improved their products in the early stage of research and development based on the advantages and disadvantages of iron orthophosphate. Improvement and optimization, such as carbon composite, Co, Ni, Mn, Ti and other metal elements doping on iron orthoph...

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  • Microcrystalline-structure metal phosphate and preparation method thereof
  • Microcrystalline-structure metal phosphate and preparation method thereof
  • Microcrystalline-structure metal phosphate and preparation method thereof

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[0044] This application describes preferred implementation modes and examples, and those skilled in the art can make appropriate changes to the implementation modes and examples described in this application on the basis of reading this application. This application therefore includes all equivalent modifications and variations of the subject matter recited in the claims of this application within the scope permitted by law.

Embodiment

[0046] The present invention is described in detail below with reference to Examples and drawings. Those skilled in the art can understand that the following examples are for the purpose of illustration and should not be construed as limiting the present invention in any way. The protection scope of the present invention is defined by the appended claims.

Embodiment 1

[0051] Add 2 L of 0.5 mol / L ferric nitrate solution into water, add 1 L of 1.8 mol / L orthophosphoric acid solution under stirring condition, continue to heat and stir at 70°C, add ammonia water as a pH value regulator, and control the pH value within the range of 2.0-2.2 , fully reacted to form polycrystalline iron phosphate precipitates; filtered, fully washed and dried to obtain polycrystalline iron phosphate powders, and the iron phosphate polycrystalline powders were calcined in air at 200°C for 60 minutes; after calcined Rapidly cool the above powder to below 80°C in air at a cooling rate of 5°C / min to obtain FePO with a microcrystalline structure 4 .2H 2 O powder.

[0052] figure 1 In the scanning electron microscope image showing the microcrystalline ferric orthophosphate of Example 1, the polycrystalline ferric phosphate powder prepared by chemical precipitation, after a lower sintering temperature, initially forms a microcrystalline phosphate powder, and the grain s...

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Abstract

The invention provides a microcrystalline-structure metal phosphate. The microcrystalline-structure metal phosphate can be expressed as MPO<4>.xH2O, wherein M can be a metal phosphate or a composite phosphate of more than two metals of Fe, Co, Ni, Mn and Al, x is equal to 0, 1 or 2, and the grain sizes of microcrystalline are 200-1,000 nanometers. The invention also provides a method for preparingthe microcrystalline-structure metal phosphate. The microcrystalline-structure metal phosphate has the characteristics of complete grain size distribution, consistent crystalline degree, reasonable tap density and the like, and finally, the lithium iron phosphate/lithium manganese phosphate/lithium cobalt phosphate positive electrode material is enabled to have the advantages of uniform grain distribution, reasonable tap density, relatively high energy density and the like.

Description

technical field [0001] The invention relates to a microcrystalline phase metal phosphate and a preparation method thereof, which belongs to the key main raw material for synthesizing and preparing positive electrode materials of lithium-ion batteries, and is finally applied to the field of lithium-ion batteries related to new energy sources such as energy storage and power. Background technique [0002] With the rapid development of new energy vehicles, large-scale energy storage, and household energy storage, the market application of lithium iron phosphate batteries is advancing by leaps and bounds. The lithium iron phosphate cathode material has low compaction, relatively poor conductivity, high internal resistance of the finished battery, and medium to high rate cycles. Problems such as poor life have become prominent again, coupled with the challenges of high-end ternary materials, lithium manganese oxide materials, fuel cells, lithium-air batteries, etc., under the back...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 王科伟张军
Owner 江苏亨利锂电新材料有限公司
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