A kind of recycling method of waste lithium iron phosphate battery cathode material

A technology for lithium iron phosphate batteries and positive electrode materials, applied in battery recycling, recycling technology, battery electrodes, etc., can solve problems such as long process, achieve low cost, simple process, and improve the effect of recycling economic benefits

Active Publication Date: 2021-09-03
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wet recovery process is long, and the metals in the leaching solution need to be separated one by one before they can be reused. At present, there are no related reports on the direct use of the leaching process to re-prepare lithium iron phosphate cathode materials

Method used

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  • A kind of recycling method of waste lithium iron phosphate battery cathode material
  • A kind of recycling method of waste lithium iron phosphate battery cathode material
  • A kind of recycling method of waste lithium iron phosphate battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Disassemble the waste lithium iron phosphate battery, collect the positive electrode sheet and cut the positive electrode sheet into 1cm*1cm block electrode sheet, soak in 8mol / L sodium hydroxide solution to completely dissolve the aluminum foil, and then filter , drying the collected filter residue at 80°C for 8 hours to obtain lithium iron phosphate powder;

[0026] 2) Dissolve pyrophosphoric acid in water to prepare a 0.5mol / L pyrophosphoric acid solution; add the powder obtained in step 1) into the pyrophosphoric acid solution, control the concentration of lithium iron phosphate powder to 200g / L, and stir at room temperature React for 9 hours, then place it for 12 days; then filter the material, collect the filter residue and filtrate respectively; wherein the filter residue is a solid mainly composed of iron phosphate, and the filtrate is a solution containing lithium ions;

[0027] 3) prepare lithium hydroxide product by existing routine process with step 2) ga...

Embodiment 2

[0032] 1) Disassemble the waste lithium iron phosphate battery, collect the positive electrode sheet and cut the positive electrode sheet into 1cm*1cm block electrode sheet, soak in 8mol / L sodium hydroxide solution to completely dissolve the aluminum foil, and then filter , drying the collected filter residue at 80°C for 9 hours to obtain lithium iron phosphate powder;

[0033] 2) Dissolve pyrophosphoric acid in water to prepare a 2.5mol / L pyrophosphoric acid solution; add the powder obtained in step 1) into the pyrophosphoric acid solution, control the concentration of lithium iron phosphate powder to 100g / L, and stir at room temperature React for 7 hours, then place it for 8 days; then filter the material, collect the filter residue and filtrate respectively; wherein the filter residue is a solid mainly composed of iron phosphate, and the filtrate is a solution containing lithium ions;

[0034] 3) prepare lithium carbonate product by existing routine process with step 2) gai...

Embodiment 3

[0039] 1) Disassemble the waste lithium iron phosphate battery, collect the positive electrode sheet and cut the positive electrode sheet into 1cm*1cm block electrode sheet, soak in 8mol / L sodium hydroxide solution to completely dissolve the aluminum foil, and then filter , drying the collected filter residue at 80°C for 6 hours to obtain lithium iron phosphate powder;

[0040] 2) Dissolve pyrophosphoric acid in water to prepare a 1.5mol / L pyrophosphoric acid solution; add the powder obtained in step 1) into the pyrophosphoric acid solution, control the concentration of lithium iron phosphate powder to 80g / L, and stir at room temperature React for 10 hours, then place it for 12 days; then filter the material, collect the filter residue and filtrate respectively; wherein the filter residue is a solid mainly composed of iron phosphate, and the filtrate is a solution containing lithium ions;

[0041] 3) prepare lithium carbonate product by existing routine process with step 2) ga...

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Abstract

The invention discloses a method for recycling positive electrode materials of waste lithium iron phosphate batteries, comprising the following steps: 1) collecting positive electrode sheets of waste lithium iron phosphate batteries, soaking the positive electrode sheets in sodium hydroxide solution until the aluminum foil is completely dissolved, Solid-liquid separation, collecting solids, drying to obtain lithium iron phosphate powder; 2) leaching the lithium iron phosphate powder with pyrophosphoric acid solution as a leaching agent, leaving standstill after leaching is completed, and then performing solid-liquid separation to collect solid and liquid respectively; 3) preparing the liquid collected in step 2) into a lithium source; 4) using the solid collected in step 2) as an iron source, mixing it uniformly with a phosphorus source, a lithium source and a carbon source, and calcining the resulting mixture in a protective atmosphere, A regenerated lithium iron phosphate positive electrode material is obtained. Compared with the prior art, the method of the present invention has simpler process and lower cost.

Description

technical field [0001] The invention relates to recycling and processing of waste lithium ion batteries, in particular to a recycling method for positive electrode materials of waste lithium iron phosphate batteries. Background technique [0002] Since it was first reported in 1997, lithium iron phosphate batteries have been widely used in electric vehicles (EVs), hybrid electric vehicles (HEVs) due to their high specific capacity, low toxicity, good cycle stability, and low material cost. ) and large energy storage facilities. Lithium-ion batteries have a certain service life, usually about 3-5 years. With the continuous increase of market demand and sales volume of lithium-ion batteries, a large amount of waste lithium-ion batteries are produced thereupon. The electrolyte and heavy metals such as copper and nickel in waste lithium-ion batteries will seep into garbage and soil after leakage, causing serious pollution to surface water, groundwater, soil and the ecological ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B26/12C01B25/45C22B3/06H01M4/58H01M10/0525H01M10/54
CPCC01B25/45C22B3/06C22B7/001C22B7/007C22B26/12H01M4/5825H01M10/0525H01M10/54Y02E60/10Y02W30/84Y02P10/20
Inventor 刘葵杨生龙范小萍史莹张鹏王红强潘齐常郑锋华蔡业政马兆玲
Owner GUANGXI NORMAL UNIV
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