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A kind of preparation method of high compaction high capacity lithium iron phosphate

A lithium iron phosphate, high-capacity technology, applied in chemical instruments and methods, phosphorus compounds, structural parts, etc., can solve the problems of large particle size of lithium iron phosphate and low capacity of lithium iron phosphate, and achieve good electrical performance and simple method , cost reduction effect

Active Publication Date: 2021-01-29
湖北云翔聚能新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the current preparation methods of high-pressure lithium iron phosphate are mainly to increase the sintering temperature, prolong the holding time and reduce the carbon content, but these methods have the following problems: the primary particle size of lithium iron phosphate will be large, so that the capacity of lithium iron phosphate Low, generally after compaction higher than 2.45g / mL, the requirement of 0.1C gram capacity is generally less than 155mAh

Method used

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  • A kind of preparation method of high compaction high capacity lithium iron phosphate
  • A kind of preparation method of high compaction high capacity lithium iron phosphate
  • A kind of preparation method of high compaction high capacity lithium iron phosphate

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Embodiment 1

[0037] A preparation method for high-compression high-capacity lithium iron phosphate, which comprises the following steps:

[0038] (1) Iron phosphate, lithium carbonate, polyethylene glycol and sucrose are weighed, then mixed, and alcohol is added to carry out wet grinding to obtain a particle diameter of 455nm;

[0039] (2) The slurry obtained in step (1) is spray-dried, and the dried alcohol vapor is condensed to obtain alcohol, and the spray-dried material is pulverized to a particle size of 4 μm to obtain a pulverized material;

[0040] (3) Put the pulverized material obtained in step (2) into the roller furnace for sintering. The sintering is divided into four stages, namely heating section, heat preservation section, decarburization section and cooling section, heating section and heat preservation section Nitrogen is introduced into the interior, and carbon dioxide is introduced into the decarburization section and the cooling section. The heating time of the heating ...

Embodiment 2

[0054] A preparation method for high-compression high-capacity lithium iron phosphate, which comprises the following steps:

[0055] (1) Iron phosphate, lithium carbonate, polyethylene glycol and sucrose are weighed, then mixed, and alcohol is added to carry out wet grinding to obtain a particle diameter of 420nm;

[0056] (2) The slurry obtained in step (1) is spray-dried, and the dried alcohol vapor is condensed to obtain alcohol, and the spray-dried material is crushed to a particle size of 5 μm to obtain a crushed material;

[0057] (3) Put the pulverized material obtained in step (2) into the roller furnace for sintering. The sintering is divided into four stages, namely heating section, heat preservation section, decarburization section and cooling section, heating section and heat preservation section Nitrogen is introduced into the interior, and carbon dioxide is introduced into the decarburization section and the cooling section. The heating time of the heating sectio...

Embodiment 3

[0071] A preparation method for high-compression high-capacity lithium iron phosphate, which comprises the following steps:

[0072] (1) Iron phosphate, lithium carbonate, polyethylene glycol and sucrose are weighed, then mixed, and alcohol is added for wet grinding to obtain a particle diameter of 445nm;

[0073] (2) The slurry obtained in step (1) is spray-dried, and the dried alcohol vapor is condensed to obtain alcohol, and the spray-dried material is crushed to a particle size of 4.2 μm to obtain a crushed material;

[0074] (3) Put the pulverized material obtained in step (2) into the roller furnace for sintering. The sintering is divided into four stages, namely heating section, heat preservation section, decarburization section and cooling section, heating section and heat preservation section Nitrogen is introduced into the interior, and carbon dioxide is introduced into the decarburization section and the cooling section. The heating time of the heating section is 7 ...

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Abstract

The invention discloses a preparation method of high-compression high-capacity lithium iron phosphate. Weigh iron phosphate, lithium carbonate, polyethylene glycol and sucrose, then mix them, add alcohol for wet grinding; spray dry the slurry, and crush the spray-dried materials to obtain crushed materials; put the crushed materials into the roller The sintering is carried out in the first furnace, and the sintering is divided into four stages, namely, the heating section, the heat preservation section, the decarburization section and the cooling section. After crushing, screening, and iron removal in the wet room, vacuum packaging is carried out to obtain high-compression and high-capacity lithium iron phosphate. The method of the invention is simple and low in cost, and at the same time, the lithium iron phosphate with high compacted density and good electrical performance can be obtained through gas treatment of carbon dioxide.

Description

technical field [0001] The invention relates to a preparation method of high-compression and high-capacity lithium iron phosphate, belonging to the technical field of lithium battery cathode materials. Background technique [0002] Lithium iron phosphate is a new lithium ion battery electrode material. It is characterized by large discharge capacity, low price, non-toxicity, and no environmental pollution. Countries around the world are competing to realize industrialized production. However, its tap density is low, which affects the capacitance. The main production method is high-temperature solid-phase synthesis, and the product index is relatively stable. [0003] The safety performance and cycle life of lithium iron phosphate are unmatched by other materials, and these are the most important technical indicators of power batteries. 1C charge and discharge cycle life up to 2000 times. The overcharge voltage of a single battery is 30V, it does not burn, and it does no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/45H01M4/58H01M10/0525
CPCY02E60/10
Inventor 蒋央芳
Owner 湖北云翔聚能新能源科技有限公司
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