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Method for improving compaction density of lithium iron phosphate through mechanical pressurization

A lithium iron phosphate, mechanical pressurization technology, applied in chemical instruments and methods, presses, inorganic chemistry, etc., can solve problems such as unfavorable battery volume energy density, limited application, and improvement

Pending Publication Date: 2022-08-09
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low compaction density of lithium iron phosphate is not conducive to the improvement of battery volume energy density, which limits its application in power batteries. Therefore, improving the compaction density of lithium iron phosphate is the focus of current research

Method used

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  • Method for improving compaction density of lithium iron phosphate through mechanical pressurization
  • Method for improving compaction density of lithium iron phosphate through mechanical pressurization
  • Method for improving compaction density of lithium iron phosphate through mechanical pressurization

Examples

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Effect test

Embodiment 2

[0029] Embodiment 2 of the present invention is a method for increasing the compaction density of lithium iron phosphate by mechanical pressure. On the basis of Embodiment 1, drying in step 01 is spray drying. Spray drying has a large contact area and rapid drying, which is suitable for large-area drying of the surface of lithium iron phosphate materials.

[0030] Embodiment 3 of the present invention is a method for increasing the compaction density of lithium iron phosphate by mechanical pressure. On the basis of Embodiment 1, the protective atmosphere in step 02 is an argon atmosphere. The argon atmosphere can prevent the lithium iron phosphate from being oxidized by oxygen at high temperature.

[0031] Example 4 of the present invention is a method for increasing the compaction density of lithium iron phosphate by mechanical pressure. On the basis of Example 1, in step 02, a heating rate of 1-5°C / min is used for calcination, and calcination is performed at 700°C for 6-10 h...

Embodiment 7

[0034] Embodiment 7 of the present invention is a positive electrode material for a lithium ion battery, and the high-density lithium iron phosphate prepared by any of the methods in Examples 1 to 6 is used as the positive electrode material for the lithium ion battery.

specific Embodiment

[0035] 1. The raw materials for preparing lithium iron phosphate are uniformly mixed, and the precursor material is obtained by spray drying;

[0036] 2. The precursor material is calcined at 700°C for 6-10 hours at a heating rate of 1-5°C / min in an argon atmosphere to obtain lithium iron phosphate;

[0037] 3. Put the lithium iron phosphate into the tablet press, keep the pressure every 5Mpa for 3-5min, pressurize it to 20-30Mpa, and crush the particles to obtain high-density lithium iron phosphate.

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Abstract

The invention relates to a method for improving the compaction density of lithium iron phosphate by mechanical pressurization, which comprises the following steps: 01, uniformly mixing raw materials for preparing lithium iron phosphate, and drying to obtain a precursor material; 02, calcining the precursor material in a protective atmosphere to obtain lithium iron phosphate; and 03, putting the lithium iron phosphate into a tablet press, compacting by adopting a segmented pressure maintaining mode, and carrying out particle crushing to obtain the lithium iron phosphate with high compaction density. The method has the beneficial effects that the space distribution of the lithium iron phosphate is changed through a mechanical pressurization method, so that the compaction density of the lithium iron phosphate is improved, the volume energy density of the lithium iron phosphate is further improved, the adopted method has no special steps, the production process is simple and easy to operate, the batch one-time preparation is good, and large-scale preparation can be realized.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a method for improving the compaction density of lithium iron phosphate by mechanical pressing. Background technique [0002] As a new generation of high-performance batteries, lithium-ion batteries have the characteristics of high energy density, good cycle performance and high safety. They are currently widely used in electronic products, energy storage and new energy vehicles. Common cathode materials for lithium-ion batteries include lithium cobalt oxide, lithium iron phosphate, and ternary materials. Because lithium iron phosphate has a unique olivine structure, it has the characteristics of stable structure, good long-term cycle performance and good safety performance. Widely used in the field of power batteries. However, the low compaction density of lithium iron phosphate is not conducive to the improvement of the volumetric energy density of the ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58H01M4/04H01M10/0525B30B11/00
CPCC01B25/45H01M4/5825H01M4/0471H01M10/0525H01M4/0435B30B11/00C01P2006/11C01P2004/03C01P2002/72C01P2006/40H01M2004/028H01M2004/021Y02E60/10
Inventor 韩建涛刘兆伟徐月方淳
Owner HUAZHONG UNIV OF SCI & TECH
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