Method for preparing lithium iron manganese phosphate by using waste lithium iron phosphate and lithium manganate materials

A technology of lithium iron manganese phosphate and lithium iron phosphate, which is applied in the field of battery material recycling, can solve the problems of inability to recycle the positive electrode material of lithium batteries, inability to promote the development of the field of battery material recycling, and inability to form economic benefits, etc., to achieve good development Foreground, satisfactory energy density, high voltage platform effect

Inactive Publication Date: 2020-06-26
桑顿新能源科技(长沙)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the adhesive is removed by roasting, so that lithium iron phosphate and aluminum foil are easily separated, and then the separated lithium iron phosphate is treated with acid leaching. After elemental analysis, phosphorus source, manganese source, lithium source, etc. are added, dried and sintered to obtain Lithium iron manganese phosphate, but too much iron source, phosphoric acid, lithium source, etc. need to be added in the treatment process, which cannot achieve the most effective recovery, save costs and protect the environment
[0007] The methods provided by the above-mentioned prior art all deal with a single waste positive electrode material, which needs to be prepared by adding a large amount of auxiliary materials, which increases the manufacturing cost and consumes more resources, cannot form economic benefits, and cannot promote the development of the field of battery material recycling. , and it is impossible to maximize the recycling of lithium battery cathode materials

Method used

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  • Method for preparing lithium iron manganese phosphate by using waste lithium iron phosphate and lithium manganate materials
  • Method for preparing lithium iron manganese phosphate by using waste lithium iron phosphate and lithium manganate materials
  • Method for preparing lithium iron manganese phosphate by using waste lithium iron phosphate and lithium manganate materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] (1) Take the filtrate A and filtrate B obtained after the treatment in (1) above, mix according to filtrate A: filtrate B=0.69L: 3L, and set n according to the element molar ratio Li :n Fe :n Mn :n P =1.04:0.8:0.2:1, add 35.23g of lithium carbonate, 117.68g of ammonium dihydrogen phosphate, slowly add ammonia water dropwise under stirring at 85°C to adjust pH=9~10, after stirring for 8 hours, suction filter, wash and dry Dry to give a solid.

[0087] (2) Take the dried solids, glucose (carbon source), titanium oxide (additive), and pure water in step (1), and carry out batching according to the formula whose mass ratio of each substance is 200:20.8:0.87:300, and grind , Control the particle size of the slurry to 450-550nm, preferably 500nm.

[0088] (3) The slurry obtained after grinding in step (2) is spray-dried, the air inlet temperature is 260° C., and the air outlet temperature is 105° C. to obtain lithium iron manganese phosphate precursor powder.

[0089] (4...

Embodiment 2

[0091] (1) Take the filtrate A and filtrate B obtained after the treatment in (1) above, mix according to filtrate A: filtrate B=1.55L: 1.7L, according to the element molar ratio is n Li :n Fe :n Mn :n P =1.04:0.5:0.5:1, add 58.18g of lithium carbonate, 293.33g of ammonium dihydrogen phosphate, slowly add ammonia water dropwise under stirring at 85°C to adjust the pH=9~10, after stirring for 8 hours, suction filter, wash and dry Dry to give a solid.

[0092] (2) Take the dried solids, glucose (carbon source), titanium oxide (additive), and pure water in step (1), and carry out batching according to the formula whose mass ratio of each substance is 200:20.8:0.87:300, and grind , Control the particle size of the slurry to 450-550nm, preferably 500nm.

[0093] (3) The slurry obtained after grinding in step (2) is spray-dried, the air inlet temperature is 260° C., and the air outlet temperature is 105° C. to obtain lithium iron manganese phosphate precursor powder.

[0094] (...

Embodiment 3

[0096] (1) Take the filtrate A and filtrate B obtained after the treatment in (1) above, after mixing according to filtrate A: filtrate B=2L: 1.46L, according to the element molar ratio is n Li :n Fe :n Mn :n P =1.04:0.4:0.6:1, add 72.02g of lithium carbonate and 382.70g of ammonium dihydrogen phosphate, slowly add ammonia water dropwise under stirring at 85°C to adjust the pH=9~10, after stirring for 8 hours, suction filter, wash and dry A solid was obtained.

[0097] (2) Take the dried solids, glucose (carbon source), titanium oxide (additive), and pure water in step (1), and carry out batching according to the formula whose mass ratio of each substance is 200:20.8:0.87:300, and grind , Control the particle size of the slurry to 450-550nm, preferably 500nm.

[0098] (3) The slurry obtained after grinding in step (2) is spray-dried, the air inlet temperature is 260° C., and the air outlet temperature is 105° C. to obtain lithium iron manganese phosphate precursor powder. ...

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Abstract

The invention provides a method for preparing lithium iron manganese phosphate from waste lithium iron phosphate and a lithium manganate material. The method comprises the following steps: (1) recycling waste lithium manganate to obtain a filtrate A; (2) recycling the waste lithium iron phosphate to obtain filtrate B; (3) carrying out ICP (Inductively Coupled Plasma) test on the filtrate A and thefiltrate B to obtain the content of each main element in the two groups of filtrate; (4) the ratio of the filtrate A to the filtrate B is determined according to the mole number x + y = 1 of Fe and Mn elements in the two groups of filtrate, x is equal to (0.9-0.1), and y is equal to (0.1-0.9); supplementing a phosphorus source and a lithium source according to the required molar ratio of P, Li, Mn and Fe, and reacting to obtain a lithium ferric manganese phosphate precursor; and then carrying out high-temperature roasting thermal reaction to obtain the lithium iron manganese phosphate positive electrode material. The method provided by the invention is relatively simple in process and convenient to operate, the two waste raw materials are wide in source and low in price, the loss of resources and the addition of auxiliary materials can be reduced, the material recovery rate can be increased, and the cost of equipment, production, raw materials and the like can be reduced.

Description

technical field [0001] The invention relates to the preparation of lithium iron manganese phosphate positive electrode materials from lithium battery positive electrode recovery materials, and belongs to the field of battery material recovery. [0002] technical background [0003] With the extensive use of lithium-ion batteries, a large number of waste lithium-ion batteries have been generated. These waste batteries are eliminated because they cannot meet the corresponding energy storage needs. If these waste batteries are directly treated like other garbage, it is likely to cause serious environmental pollution, and there is also a potential fire hazard caused by battery short circuit. Therefore, recycling lithium battery waste has become necessary in order to recycle materials, save costs and protect the environment. [0004] Lithium manganese iron phosphate material relative to Li + The electrode potential of / Li is 4.1V, which is higher than the 3.4V of lithium iron p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45C01B32/05H01M4/58H01M4/62H01M10/54H01M10/0525
CPCC01B25/45C01P2004/03C01P2006/40C01B32/05H01M4/5825H01M4/625H01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 殷磊王长伟陈韬商士波李东南
Owner 桑顿新能源科技(长沙)有限公司
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