Method for recycling and preparing lithium iron manganese phosphate from positive electrode materials of waste lithium iron phosphate batteries

A lithium iron phosphate battery, lithium iron manganese phosphate technology, applied in battery recycling, waste collector recycling, recycling technology and other directions, can solve the problems of incomplete recycling, low recovery rate, etc., to solve the recycling problem and improve the working voltage Effect

Active Publication Date: 2015-05-13
北京赛德美资源再利用研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the defects of low recovery rate and incomplete recovery in the prior art and method, the present invention removes the viscose by roasting, so that lithium iron phosphate and aluminum foil can be easily separated, and is suitable for ferric phosphate in water-based and oil-based viscose systems. Lithium battery: Lithium iron phosphate separated by acid leaching, retains lithium and some iron, phosphorus and other elements, through elemental analysis, supplements manganese and phosphorus, and obtains lithium iron manganese phosphate by roasting

Method used

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  • Method for recycling and preparing lithium iron manganese phosphate from positive electrode materials of waste lithium iron phosphate batteries
  • Method for recycling and preparing lithium iron manganese phosphate from positive electrode materials of waste lithium iron phosphate batteries

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Embodiment 1

[0025] 1) Discharge the residual power of the waste lithium iron phosphate battery, disassemble the battery, separate the positive electrode, negative electrode and separator, wash the positive electrode and dry it;

[0026] 2) Heat-treat the dried positive electrode sheet at 450°C for 3 hours in a muffle furnace, separate the heat-treated lithium iron phosphate from the aluminum foil, and recycle the aluminum foil by smelting;

[0027] 3) Take 50g of the lithium iron phosphate separated in the previous step and add 199ml of 4mol / L hydrochloric acid to the oil bath at 70°C. After stirring for 5 hours, filter to separate the solid and liquid, and suction filter to obtain 29.3g of brick red precipitate and filtrate;

[0028] 4) The filtrate is tested and analyzed, and the molar ratio of the elements is n Li :n Fe :n Mn :n p =1:0.2:0.8:1, add manganese carbonate solid 27.7g, ammonium monohydrogen phosphate 18.6g in the obtained filtrate, after stirring and dissolving, control ...

Embodiment 2

[0032] 1) Discharge the residual power of the waste lithium iron phosphate battery, disassemble the battery, separate the positive electrode, negative electrode and separator, wash the positive electrode and dry it;

[0033] 2) After heat-treating the dried positive electrode sheet at 500°C for 2 hours in a muffle furnace, the heat-treated lithium iron phosphate and aluminum foil are separated, and the aluminum foil is recovered by smelting;

[0034] 3) Take 50g of the lithium iron phosphate separated in the previous step and add 199ml of 4mol / L nitric acid in an oil bath at 80°C. After stirring for 4 hours, filter to separate the solid and liquid, and suction filter to obtain 24.7g of brick-red precipitate and filtrate;

[0035] 4) The filtrate is tested and analyzed, and the molar ratio of the elements is n Li :n Fe :n Mn :n p =1:0.3:0.7:1, add manganese nitrate solid 37.7g, ammonium hydrogen phosphate 16.5g in the obtained filtrate, after stirring and dissolving, control...

Embodiment 3

[0039] 1) Discharge the residual power of the waste lithium iron phosphate battery, disassemble the battery, separate the positive electrode, negative electrode and separator, wash the positive electrode and dry it;

[0040]2) After the dried positive electrode sheet is heat-treated in a muffle furnace at 600°C for 1 hour, the heat-treated lithium iron phosphate is separated from the aluminum foil, and the aluminum foil is recycled by smelting;

[0041] 3) Take 100g of the lithium iron phosphate separated in the previous step and add 113ml of 4mol / L sulfuric acid to the oil bath at 90°C. After stirring for 3 hours, filter to separate the solid and liquid, and suction filter to obtain 40.2g of brick-red precipitate and filtrate;

[0042] 4) The filtrate is tested and analyzed, and the molar ratio of the elements is n Li :n Fe :n Mn :n p =1:0.4:0.6:1, add manganese nitrate solid 62.5g, ammonium dihydrogen phosphate 18.5g to the obtained filtrate, after stirring and dissolving...

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Abstract

The invention discloses a method for recycling and preparing lithium iron manganese phosphate from positive electrode materials of waste lithium iron phosphate batteries. The method comprises the following steps: (1) discharging remnant electric quantities of the waste lithium iron phosphate batteries, disassembling the batteries, taking positive electrode sheets, washing, drying, roasting and separating lithium iron phosphate from aluminum foils; (2) by controlling the addition of acid, carrying out acid leaching on separated lithium iron phosphate, and filtering to separate insoluble iron phosphate and iron oxide to obtain a filtrate; (3) analyzing the filtrate, adjusting the molar ratio of the elements, namely, nLi to (nFe+Mn) to nP to 1: 1: 1 and adding a manganese source and a phosphorus source; and adjusting the pH to obtain a precipitate; drying the precipitate, adding a carbon source and mixing to obtain a pre-sintered material; and (4) carrying out solid sintering treatment on the pre-sintered material under non-oxidizing atmosphere to obtain the lithium iron manganese phosphate serving as the lithium ion battery positive electrode material. The method has the advantages of simplicity in process, environmental friendliness, good product properties and the like.

Description

technical field [0001] The invention relates to the field of recycling lithium iron phosphate waste batteries, in particular to a method for recycling and preparing lithium iron manganese phosphate from lithium iron phosphate waste batteries. Background technique [0002] With the explosive development of 3C electronic products and various electric tools, people's demand for secondary batteries has increased dramatically. Lithium-ion batteries have the characteristics of environmental friendliness, high specific energy, high voltage platform, long cycle life, good rate performance, small self-discharge, and no memory effect, which are far superior to lead-acid, Ni-Cd, and Ni-MH batteries. , It has been widely used in military and civilian fields. At present, the lithium-ion secondary battery with lithium iron phosphate as the positive electrode material has been widely used in the power battery of electric tools and electric vehicles due to its low cost and good safety perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45B09B3/00H01M10/54
CPCY02W30/84
Inventor 李荐邓鹏周宏明
Owner 北京赛德美资源再利用研究院有限公司
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