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A kind of high compaction, low resistance lithium iron phosphate and preparation method thereof

A lithium iron phosphate, low-resistance technology, applied in the field of lithium-ion battery cathode materials, can solve the problems of poor conductivity of lithium iron phosphate, low energy density of cells, and many fine powders of lithium iron phosphate, achieve excellent resistivity, and solve problems Stability, improved compaction effect

Active Publication Date: 2022-05-06
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium iron phosphate also has the following disadvantages: lithium iron phosphate generally requires carbon coating treatment due to its poor conductivity.
This requires higher crushing strength, which brings more serious carbon stripping, which leads to more fine powder of lithium iron phosphate, lower compaction, lower electrical conductivity and lower energy density of subsequent cells

Method used

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  • A kind of high compaction, low resistance lithium iron phosphate and preparation method thereof
  • A kind of high compaction, low resistance lithium iron phosphate and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A preparation method of high compaction and low resistance lithium iron phosphate, comprising the following steps:

[0028] S1. Mix 10kg iron phosphate, 0.1kg glucose, 2.5kg lithium carbonate and 15.4kg deionized water under the condition of 150r / min for 2h, and then use zirconium balls with a diameter of 0.5mm as the grinding medium in the stirring mill. Coarse grinding to a particle size of 1.0 μm, and then in a sand mill, using zirconium balls with a diameter of 0.2 mm as the grinding medium, finely grinding to a particle size of 0.4 μm to obtain a mixed slurry, and spray-drying the mixed slurry to obtain a dry material;

[0029] S2, sintering the dried material in a box furnace under a nitrogen atmosphere, the oxygen content of the sintering is ≤10ppm, the sintering temperature is 760°C, and the sintering time is 20h to obtain a primary sintered material, the carbon content of the primary sintered material is 1.55%;

[0030] S3. Mix the primary sintering material an...

Embodiment 2

[0033] A preparation method of high compaction and low resistance lithium iron phosphate, comprising the following steps:

[0034] S1. Mix 10kg iron phosphate, 0.12kg glucose, 2.5kg lithium carbonate and 15.4kg deionized water under the condition of 150r / min for 2h, and then use zirconium balls with a diameter of 0.5mm as the grinding medium in the stirring mill. Coarse grinding to a particle size of 2.0 μm, and then in a sand mill, using zirconium balls with a diameter of 0.2 mm as the grinding medium, finely grinding to a particle size of 0.6 μm to obtain a mixed slurry, and spray-drying the mixed slurry to obtain a dry material;

[0035] S2, sintering the dry material in an inert atmosphere, the oxygen content of the sintering is ≤10ppm, the sintering temperature is 780°C, and the sintering time is 20h to obtain a primary sintered material, the carbon content of the primary sintered material is 1.5%;

[0036] S3. Mix the primary sintered material and PVDF at 500r / min for 60...

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Abstract

The invention discloses a high-compression, low-resistance lithium iron phosphate and a preparation method thereof. After mixing iron phosphate, a carbon source and a lithium source, coarse grinding and fine grinding are performed to obtain nanoscale slurry, and the slurry is spray-dried to obtain The dry material is calcined under an inert atmosphere to obtain a primary sintered material, mixed with PVDF, and then calcined under an inert atmosphere to obtain a secondary sintered material, which is air-pulverized and then demagnetized to obtain the final product. The preparation method of the present invention is simple, the cost is low, and the prepared lithium iron phosphate has high compaction density and low resistivity, which provides strong support for the processing performance of the battery cell, especially the improvement of the energy density and double charging and discharging.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a high-compression, low-resistance lithium iron phosphate and a preparation method thereof. Background technique [0002] Lithium-ion batteries are used in various electronic devices due to their high energy density, fast charging and discharging speed, and long cycle life. With the development of society and the rise of the field of new energy vehicles, the improvement of the energy density of lithium-ion batteries is an inevitable result of the market. Seeking active materials with higher specific capacity has become a hot spot and research direction in the industry. [0003] Lithium iron phosphate has attracted widespread attention due to its good cycle performance, high safety, low price, and environmental friendliness, and has become one of the most mainstream cathode materials for power lithium-ion batteries on the market. Ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/5825H01M4/625H01M10/0525H01M4/362H01M2004/028Y02E60/10
Inventor 张小健李坤薛兵
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY