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A method for dissolve positive electrode active material of waste lithium ion battery

A cathode active material, lithium-ion battery technology, applied in battery electrodes, battery recycling, waste collector recycling, etc., can solve problems such as component loss and solvent separation difficulties

Active Publication Date: 2019-01-11
山西根复科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some patents have obtained the precursor of lithium iron phosphate through solvent extraction after introducing organic acid for dissolution, but if some organic acid salts can also be dissolved in organic solvents, it will cause the loss of components and bring difficulties to the separation of solvents

Method used

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  • A method for dissolve positive electrode active material of waste lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0031] Add 50 g of the separated waste lithium iron phosphate powder to the mixed organic acid solution, heat and stir to dissolve it. The organic acid solution is acetic acid, succinic acid and citric acid, the added amount is 1 liter, and the temperature for heating and dissolution is 60°C. The solid-to-liquid ratio of the waste lithium iron phosphate powder and the organic acid solution is 50 g / liter, and the reaction time for heating and dissolution is 0.5 hours; then after adding hydrogen peroxide, the amount of hydrogen peroxide is the waste lithium iron phosphate powder 1% by mass, a clear solution is obtained after filtration, and the content of lithium source, iron source, and phosphorus source in the clear solution is adjusted so that the molar ratio of lithium source, iron source, and phosphorus source is 1:1:1 to obtain Mediation solution; Concentrate the mediation solution, and then spray-dry the concentrated mediation solution to obtain a precursor of lithium iron ...

Embodiment 2

[0033] Add 50 g of the separated waste lithium iron phosphate powder to the mixed organic acid solution, heat and stir to dissolve it. The mixed organic acid solution is ammonium formate, citric acid, and oxalic acid, the added amount is 250 ml, and the temperature for heating and dissolution is 60°C. The solid-to-liquid ratio of the waste lithium iron phosphate powder and the organic acid solution is 200 g / L, and the reaction time for heating and dissolution is 3 hours; then after adding hydrogen peroxide, the amount of hydrogen peroxide is the waste lithium iron phosphate powder 8% by mass, a clear solution is obtained after filtration, and the content of lithium source, iron source, and phosphorus source in the clear solution is adjusted so that the molar ratio of lithium source, iron source, and phosphorus source is 1.3:1:1 to obtain Mediation solution; Concentrate the mediation solution, and then spray-dry the concentrated mediation solution to obtain a precursor of lithium...

Embodiment 3

[0035] Add 50 g of the separated waste lithium iron phosphate powder into the mixed organic acid solution, heat and stir to dissolve it. The organic acid solution is ammonium acetate, oxalic acid, and citric acid, the added amount is 500 ml, and the temperature for heating and dissolution is 90°C. The solid-to-liquid ratio of the waste lithium iron phosphate powder and the organic acid solution is 100 g / liter, and the reaction time for heating and dissolution is 1.5 hours; then after adding hydrogen peroxide, the amount of hydrogen peroxide is the waste lithium iron phosphate powder 0.5% by mass, a clear solution is obtained after filtration, and the content of lithium source, iron source, and phosphorus source in the clear solution is adjusted so that the molar ratio of lithium source, iron source, and phosphorus source is 1.2:1:1 to obtain Mediation solution; Concentrate the mediation solution, and then spray-dry the concentrated mediation solution to obtain a precursor of lit...

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Abstract

A method for dissolve positive electrode active material of waste lithium ion battery includes adde waste lithium iron phosphate powder into aqueous solution of organic acid dissolution liquid, heating to dissolve, adde hydrogen peroxide, and filtering to obtain clarified dissolution liquid; Regulating the content of lithium source, iron source and phosphorus source in the clarification solution to obtain a mediation solution; Drying the mediating solution to obtain a precursor of lithium iron phosphate; Carbon-coated lithium iron phosphate is obtained by heat treatment of the precursor undernitrogen protection. A lithium iron phosphate positive electrode powder is dissolved by introduce mixed organic acid combined with hydrogen peroxide, after dissolution, the impurities such as coated carbon in the positive electrode material are removed by filtration, the precursor is obtained by spray drying after adjusting the proportion of phosphorus source, iron source and lithium source, and the precursor is heat-treated under the protection of nitrogen, and the organic acid in the precursor is used as carbon source to obtain carbon-coated lithium iron phosphate. Realize the adjustment ofcarbon coating amount, and obtain high-performance lithium iron phosphate.

Description

Technical field [0001] The present invention relates to the technical field of reprocessing waste lithium ion batteries, in particular to a method for dissolving the anode active material of waste lithium ion batteries. Background technique [0002] Lithium iron phosphate as a cathode material for lithium-ion batteries has many advantages, such as low cost, wide sources of raw materials, high safety performance of the battery composed, and long cycle life. At present, lithium iron phosphate batteries are widely used in automotive power batteries, energy storage and other fields. Compared with other types of batteries, because lithium iron phosphate batteries do not contain valuable elements, the industry generally believes that the value of lithium iron phosphate recycling is low, and the income obtained cannot deduct the recycling cost of lithium iron phosphate batteries. A big problem in lithium recycling. [0003] There are many methods for dissolving lithium iron phosphate, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M4/36H01M4/58H01M4/62
CPCH01M4/366H01M4/5825H01M4/625H01M10/54Y02E60/10Y02W30/84
Inventor 张俊喜刘蔚王昆仑
Owner 山西根复科技有限公司
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