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Comprehensive recycling method of lithium ion battery anode material

A technology for lithium ion batteries and cathode materials, which is applied in the field of comprehensive recycling of cathode materials in lithium iron phosphate series and ternary series batteries, can solve the problem of recycling ternary batteries alone, no recycling of scrapped batteries, small profit space, and difficulty in forming a scale To avoid the risk of production line shutdown, reduce sorting costs, and improve economic benefits

Active Publication Date: 2017-10-20
南京国轩新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned disclosed patents only recycle lithium iron phosphate batteries or ternary batteries separately, and the profit margin of recycling lithium iron phosphate batteries alone is very small. Currently, there are not enough scrap batteries for recycling of ternary batteries alone, and it is difficult to form a scale change

Method used

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  • Comprehensive recycling method of lithium ion battery anode material

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Effect test

Embodiment 1

[0027] A kind of comprehensive recovery method of lithium ion battery cathode material, such as figure 1 Shown:

[0028] (1) Take 2kg of the mixed material of lithium iron phosphate and the positive electrode material of the ternary battery, carry out high-temperature pretreatment at 600°C in the air for 6 hours, take it out after natural cooling; oxidize the ferrous iron in the lithium iron phosphate to trivalent Iron, and remove part of the carbon powder in the powder;

[0029] (2) adding the mixed material after high temperature pretreatment into 8L deionized water for beating treatment to obtain a beating liquid;

[0030] (3) Add 24 mol of concentrated sulfuric acid and 6 L of hydrogen peroxide, stir and react at 85° C. for 2 hours, then filter the reactant to remove insoluble matter, and obtain filtrate A;

[0031] (4) After the pH value of filtrate A is adjusted to 1.5-, calculate the add-on of iron powder by Cu content in the test filtrate A, remove the copper element...

Embodiment 2

[0037] (1) Take 2kg of the mixed material of lithium iron phosphate and the positive electrode material of the ternary battery, carry out high-temperature pretreatment at 800°C in the air for 2 hours, take it out after natural cooling; oxidize the ferrous iron in the lithium iron phosphate to trivalent Iron, and remove part of the carbon powder in the powder;

[0038] (2) adding the mixed material after high-temperature pretreatment into 4L deionized water for beating treatment to obtain a beating liquid;

[0039] (3) Add 20 mol of concentrated sulfuric acid and 2 L of hydrogen peroxide, stir and react at 60° C. for 3 hours, then filter the reactant to remove insoluble matter, and obtain filtrate A;

[0040] (4) After the pH value of filtrate A is adjusted to 1.5, the addition of iron powder is calculated by testing the Cu content in filtrate A, and the copper element in filtrate A is removed through filtration, and the removal rate of copper element is about 90%, and then adj...

Embodiment 3

[0046] (1) Take 2kg of the mixed material of lithium iron phosphate and the positive electrode material of the ternary battery, carry out high-temperature pretreatment at 400°C in the air for 10 hours, take it out after natural cooling; oxidize the ferrous iron in the lithium iron phosphate to trivalent Iron, and remove part of the carbon powder in the powder;

[0047] (2) adding the mixed material after high-temperature pretreatment into 20L deionized water for beating treatment to obtain a beating liquid;

[0048] (3) Add 30 mol of concentrated sulfuric acid and 10 L of hydrogen peroxide, stir and react at 95° C. for 0.5 hour, then filter the reactant to remove insoluble matter to obtain filtrate A;

[0049] (4) after the pH value of filtrate A is adjusted to 2, calculate the add-on of iron powder by Cu content in the test filtrate A, remove the copper element in filtrate A through filtration, copper element removal rate is about 90%, then adjust When the pH value reaches 3...

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Abstract

The invention provides a comprehensive recycling method of a lithium ion battery anode material. The method comprises the steps that the anode material of lithium iron phosphate and the anode material of a ternary battery are subjected to high-temperature pretreatment; a product is added into water for pulping processing; concentrated sulfuric acid and hydrogen peroxide are added, and filtering is performed to remove undissolved substances; iron powder is added, filtering is performed to remove copper elements, and heating is performed to generate iron aluminum vanadium slag; a calcium chloride solution is added, and filtering is performed to remove phosphate radicals; series-connection countercurrent extraction is performed through an extraction agent P204 to remove Fe and Ca impurities, and series-connection countercurrent extraction is performed through an extraction agent P507 to separate Ni, Co, Mn elements from Li elements; the organic phase is subjected to reverse extraction with sulfuric acid, a Ni, Ca and Mn solution is obtained, and recycling of nickel, cobalt and manganese is achieved; and the water phase is concentrated, and then a saturated sodium carbonate solution is added to generate lithium carbonate precipitation. By means of the comprehensive recycling method, the anode material of a lithium iron phosphate battery and the anode material of the ternary battery are recycled simultaneously, the battery separation cost is lowered, and the economic benefits of lithium battery recycling are increased.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a comprehensive recovery method for positive electrode materials in lithium iron phosphate batteries and ternary batteries. Background technique [0002] At present, there are two main types of lithium-ion batteries used in the field of new energy vehicles: one is lithium iron phosphate (LFP) battery with positive electrode material, and the other is ternary material battery. At present, China basically adopts the lithium iron phosphate route. The advantages of the LFP battery system are good cycle performance and reliable safety performance. However, due to the insufficient energy density of lithium iron phosphate, it has become a bottleneck restricting its development; while the high voltage and high energy of the ternary battery Density promises to meet people's needs. In the next few years, the supply of high-end ternary system power lithium batteries will be i...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B26/12C22B23/00C22B47/00H01M10/54
CPCC22B7/007C22B23/043C22B23/0461C22B26/12C22B47/00H01M10/54Y02P10/20Y02W30/84
Inventor 王德钊刘春丽刘浩曹利娜
Owner 南京国轩新能源有限公司
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