Treatment method for lithium iron phosphate material

A technology of lithium iron phosphate and a treatment method, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve problems such as affecting migration and capacity attenuation, and achieve the effects of improving ion conductivity, improving high-temperature performance, and reducing iron dissolution

Inactive Publication Date: 2012-01-25
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Recent studies have shown that during high-temperature (especially above 60°C) cycling, iron leaching occurs in the lithium iron phosphate cathode, and the leached iron deposits on the surface of the anode, affecting the migration of lithium ions in the anode SEI film, resulting in a large capacity fading

Method used

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  • Treatment method for lithium iron phosphate material
  • Treatment method for lithium iron phosphate material
  • Treatment method for lithium iron phosphate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Prepare 150ml of 100ppm HF aqueous solution, add 50g of carbon-coated lithium iron phosphate powder, seal the container, mix evenly, transfer to a constant temperature oven at 60°C, and stir at constant temperature for 24 hours to obtain a black suspension. The solution was cooled to room temperature, suction filtered, and the pH value and dissolved Fe content of the filtrate were shown in the appendix figure 1 . The filtrate was washed repeatedly with deionized water, and after preliminary drying in an oven, it was transferred to a vacuum oven at a constant temperature of 130°C for vacuum drying for 24 hours. After grinding, the acid-treated lithium iron phosphate powder was obtained, and the water content of the powder was 2400ppm. Grinding after cooling to obtain HF-treated lithium iron phosphate material.

Embodiment 2

[0029] Prepare 150ml of 9000ppm hydrochloric acid aqueous solution, add 50g of lithium iron phosphate powder, seal the container, mix evenly, transfer to a constant temperature oven at 26°C, and stir at constant temperature for 15 hours to obtain a black suspension. Cool the black suspension to room temperature , suction filtration, and the pH value of the filtrate was 7.5. The filtrate was washed repeatedly with deionized water, and after preliminary drying in an oven, it was transferred to a vacuum oven at a constant temperature of 200°C for vacuum drying for 21 hours. After grinding, the acid-treated lithium iron phosphate powder was obtained, and the water content of the powder was 5000ppm. Grinding after cooling to obtain the lithium iron phosphate material treated with hydrochloric acid.

Embodiment 3

[0031] Prepare 150ml of 50ppm nitric acid aqueous solution, add 50g of lithium iron phosphate powder, seal the container, mix evenly, transfer to a constant temperature oven at 100°C, and stir at constant temperature for 32 hours to obtain a black suspension. Cool the black suspension to room temperature , suction filtration, and the pH value of the filtrate was 7.7. The filtrate was washed repeatedly with deionized water, and after preliminary drying in an oven, it was transferred to a vacuum oven at a constant temperature of 80°C for vacuum drying for 25 hours. After grinding, the nitric acid-treated lithium iron phosphate powder was obtained, and the water content of the powder was 3000ppm. Grinding after cooling to obtain the lithium iron phosphate material treated with nitric acid.

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Abstract

The invention relates to the technical field of lithium ion batteries and particularly relates to a treatment method for a lithium iron phosphate material, which comprises the steps of acidic solution preparation, constant-temperature agitation, suction filtration, washing, vacuum drying and cooling to obtain the processed lithium iron phosphate material. Compared with the prior art, by using acidic solution to conduct constant-temperature treatment on lithium iron phosphate, residual iron impurities in raw materials and a synthesis process can be effectively removed, the dissolved iron elements in a cycle process are reduced, the cycle stability of the material is improved, and the ion conductivity and the high-rate performance of the material can be improved through the etching effect of acid on particle surface layers.

Description

Technical field: [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for processing lithium iron phosphate materials. Background technique: [0002] With the rise of the low-carbon economy, lithium-ion batteries are also actively developing in the direction of power vehicles and grid energy storage. The development of lithium-ion batteries that can be quickly charged and discharged and adapted to the harsh conditions of use of power vehicles has become the focus of research. Lithium-ion battery cathode material is the bottleneck that determines the development of lithium-ion batteries, which determines the performance and price of lithium-ion batteries. Therefore, the research and development of high-performance cathode materials for lithium-ion batteries has become the key to the development of lithium-ion batteries. [0003] In 1997, the Goodenough research group [A.K.Padhi, K.S.Nanjundaswarmy, B.Goodenough, J.electroche...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 许金梅李伟许国成许瑞赵丰刚
Owner DONGGUAN AMPEREX TECH
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