Preparation method and application of lithium iron phosphate positive electrode material

A positive electrode material, lithium iron phosphate technology, applied in the field of preparation of lithium iron phosphate positive electrode material, can solve the problems of poor rate performance, poor performance, and many control points, to achieve performance optimization and improvement, easy to operate the preparation process, and the preparation process simple effect

Active Publication Date: 2021-06-04
GUANGDONG BRUNP RECYCLING TECH +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of lithium iron phosphate material itself is that the electronic conductivity and ionic conductivity are low, and it shows poor rate performance when used as a cathode material in lithium-ion batteries.
From the perspective of some technologies such as the above, although the material properties can be bet

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  • Preparation method and application of lithium iron phosphate positive electrode material
  • Preparation method and application of lithium iron phosphate positive electrode material
  • Preparation method and application of lithium iron phosphate positive electrode material

Examples

Experimental program
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Example Embodiment

[0032] Example 1

[0033] A method of preparation of lithium iron phosphate positive material, including the following steps:

[0034] (1) Press the ferric iron, pelletary, lithium hydroxide, and lithium hydroxide to 1: 1.03: 1.07, weigh weight, then add 4.5% glucose and 2.36% polyacrylic acid as carbon source, additives 0.08% of titanium oxide and 0.10% nitrate were mixed, and the mixed material particle diameter (D50) obtained after mixing the high-efficiency mixture was 35 μm;

[0035] (2) The mixed material was raised to 650 ° C at a rate of 3 ° C / min under a pure nitrogen atmosphere for sintering for 5 h, and the gas flow was pulverized and pulverized, pulverized particle size (D50) 1.2 μm;

[0036] (3) The pulverized material was subjected to secondary sintering, raised to 720 ° C at a rate of 5 ° C / min for sintering 8 h, and the ethanol 140 g / kg was introduced, and the lithium iron phosphate positive material for the production of ethanol was obtained. .

Example Embodiment

[0037] Example 2

[0038] A method of preparation of lithium iron phosphate positive material, including the following steps:

[0039] (1) Press the ferrite, lithium carbonate, and phosphate, a hydroxide is 1: 1.04: 1.09, weigh weight, add 6.5% sucrose and 4.6% polyvinyl alcohol as a carbon source, additives 0.24% ammonium metavanadate and 0.22% nine-water glycome were mixed, and the mixed material particle diameter (D50) obtained after mixing the high-efficiency mixture was mixed into 23 μm;

[0040] (2) The mixture was raised to 690 ° C at a rate of 4 ° C / min under a pure nitrogen gas atmosphere for sintering for 6 h, and the airflow was pulverized, and the pulverized particle size (D50) was 1.4 μm;

[0041] (3) The pulverized material was subjected to secondary sintering, raised to 740 ° C at a rate of 6.5 ° C / min for sintering 8 h, and the ethylene glycol 185 g / kg was introduced, and the lithium iron phosphate was obtained after cooling. Positive material.

Example Embodiment

[0042] Example 3

[0043] A method of preparation of lithium iron phosphate positive material, including the following steps:

[0044] (1) Press the ferrite and lithium hydroxide according to the Fe: p: Li molar ratio of 1: 1.06: 1.10, weigh weight, add 5.5% sucrose, 3.5% polyethylene glycol, 1.2% oxalic acid as a carbon source, additive The mixture of 0.13% of titanium oxide and 0.16% magnesium oxide was mixed, and the mixed material particle diameter (D50) obtained after mixing the high-efficiency mixture was 55 μm;

[0045](2) The mixed material was raised to 670 ° C at a rate of 5 ° C / min under a pure nitrogen gas atmosphere for sintering for 8 h, and the airflow was pulverized, and the pulverized particle size (D50) was carried out 0.8 μm;

[0046] (3) The pulverized material was subjected to secondary sintered, raised to 745 ° C at a rate of 8 ° C / min for sintering for 6 h, and the methanol 125 g / kg was introduced, and the lithium iron phosphate positive material is ob...

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Abstract

The invention belongs to the technical field of lithium ion battery material preparation, and provides a preparation method and application of a lithium iron phosphate positive electrode material, and the preparation method comprises the following steps: (1) mixing and refining an iron source, a phosphorus source, a lithium source, a carbon source and an additive by a dry method to obtain a mixed material; (2) sintering the mixed material for the first time, and then crushing to obtain a crushed material; and (3) sintering the crushed material for the second time, introducing a gasifiable organic carbon source during sintering, and then cooling to obtain the lithium iron phosphate positive electrode material. According to the invention, high-efficiency mixing equipment is used for carrying out one-step mixing refining, sintering and crushing on the raw materials, then secondary sintering is carried out, and a gasifiable organic carbon source is used for supplementing carbon coating, so that the material has better carbon coating layer and particle morphology, the obtained product has better performance, the performance is greatly improved compared with the same type of products on the market, the cycling stability is good, and the general requirements of high-performance lithium iron phosphate batteries can be met.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium ion battery materials, in particular to a preparation method and application of a lithium iron phosphate cathode material. Background technique [0002] Lithium-ion battery materials have seen the prospect of new energy in the new century due to their high capacity and renewable characteristics since their appearance. Lithium iron phosphate, as a high-safety, good-cycling, and environment-friendly positive electrode material, has always been a favored research object in the lithium battery industry. Its application fields involve various commercial vehicle batteries, energy storage base stations, and many electrical equipment, etc. . However, the disadvantage of lithium iron phosphate material itself is that the electronic conductivity and ionic conductivity are low, and it shows poor rate performance when used as a cathode material in lithium-ion batteries. Therefore, in order to...

Claims

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Application Information

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IPC IPC(8): C01B25/45C01B32/05H01M4/58H01M10/0525
CPCC01B25/45C01B32/05H01M4/5825H01M10/0525H01M2004/021H01M2004/028C01P2004/03Y02E60/10C01P2004/61
Inventor 张世庆阮丁山唐盛贺李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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