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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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  • Summary
  • 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 better improved and improved, the wet process is more cumbersome, with more control points, and the overall cost cannot be significantly reduced.
In addition, some rare dry-mixing and all-solid-phase processes, although the process is simple, the stability of the obtained materials is not high enough, and the performance is also poor.

Method used

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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
Comparison scheme
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Embodiment 1

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

[0034] (1) Ferric oxalate, ammonium dihydrogen phosphate, and lithium hydroxide are 1:1.03:1.07 according to the molar ratio of Fe:P:Li, weigh the weight, then add 4.5% glucose and 2.36% polyacrylic acid as carbon source, the additive is 0.08% titanium oxide and 0.10% barium nitrate are mixed, and the particle size (D50) of the mixed material obtained after mixing and refining by a high-efficiency mixer is 35 μm;

[0035] (2) Heat the mixed material at a rate of 3°C / min to 650°C in a pure nitrogen atmosphere for sintering and heat preservation for 5 hours, and perform airflow crushing after discharging, and the crushing particle size (D50) is 1.2 μm;

[0036] (3) The pulverized material is subjected to secondary sintering, and the temperature is raised to 720°C at a rate of 5°C / min for sintering and heat preservation for 8 hours. During this period, 140g / kg of ethanol is i...

Embodiment 2

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

[0039] (1) Ferric phosphate, lithium carbonate, and ammonium monohydrogen phosphate are 1:1.04:1.09 according to the molar ratio of Fe:P:Li, weigh the weight, then add 6.5% sucrose and 4.6% polyvinyl alcohol as the carbon source, and the additive is 0.24% ammonium metavanadate and 0.22% chromium nitrate nonahydrate are mixed, and the particle size (D50) of the obtained mixed material after mixing and refining by a high-efficiency mixer is 23 μm;

[0040] (2) The mixed material was heated up to 690°C at a rate of 4°C / min in a pure nitrogen atmosphere for sintering and heat preservation for 6 hours. After discharging, it was jet-milled, and the crushed particle size (D50) was 1.4 μm;

[0041] (3) The pulverized material is subjected to secondary sintering, and the temperature is raised to 740°C at a rate of 6.5°C / min for sintering and heat preservation for 8 hours. During th...

Embodiment 3

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

[0044] (1) Iron phosphate and lithium hydroxide are weighed according to Fe:P:Li molar ratio of 1:1.06:1.10, then add 5.5% sucrose, 3.5% polyethylene glycol, 1.2% oxalic acid as carbon source, additive 0.13% titanium oxide and 0.16% magnesium oxide are mixed, and the particle size (D50) of the obtained mixed material after mixing and refining by a high-efficiency mixer is 55 μm;

[0045](2) Raise the temperature of the mixed material to 670°C at a rate of 5°C / min in a pure nitrogen atmosphere for sintering and heat preservation for 8 hours, and perform airflow crushing after discharging, and the crushing particle size (D50) is 0.8 μm;

[0046] (3) The pulverized material is subjected to secondary sintering, and the temperature is raised to 745°C at a rate of 8°C / min for sintering and heat preservation for 6 hours. During this period, 125g / kg of methanol is introduced, and ...

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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
CPCC01B25/45C01B32/05H01M4/5825H01M10/0525H01M2004/021H01M2004/028C01P2004/03Y02E60/10C01P2004/61H01M4/136H01M4/1397C01P2004/80C01P2006/40H01M4/366H01M4/60
Inventor 张世庆阮丁山唐盛贺李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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