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Fe3O4/FeO/C composite material, and preparation method and application thereof

A technology for composite materials and positive electrode materials, which is applied in Fe3O4/FeO/C composite materials and its preparation and application fields, can solve the problems of increased synthesis cost and complicated process, and achieve the effects of reduced preparation cost, abundant sources, and efficient recycling

Active Publication Date: 2021-08-31
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reported synthesis methods of nano-carbon materials, surface carbon-coated or carbon-composited metal oxide materials have the disadvantages of complex processes, and usually the synthetic raw materials need to use new carbon sources (instead of cheap graphitic carbon ), the carbon source heat treatment process in the synthesis process will generate some environmentally polluting gases, and the synthesis process needs to add more expensive metal salts such as cobalt, nickel salts, etc., which greatly increase the synthesis cost

Method used

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  • Fe3O4/FeO/C composite material, and preparation method and application thereof
  • Fe3O4/FeO/C composite material, and preparation method and application thereof
  • Fe3O4/FeO/C composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] a kind of Fe 3 o 4 The preparation method of / FeO / C composite material, comprises the following steps:

[0036] (1) Disassemble the waste lithium iron phosphate battery, take out the positive electrode sheet, separate the aluminum foil and the positive electrode material in the positive electrode sheet, and add the collected positive electrode material to a solution of 3mol / L hydrochloric acid and 30%H 2 o 2 solution (the volume ratio of the two is 2:1), leaching in an open container at 50°C for 1 hour, and placing it at room temperature for 4 hours to obtain a hydrochloric acid leach solution containing lithium and iron; The concentration of lithium is 15g / L and 3g / L respectively;

[0037] (2) Pretreat the 717 type anion exchange resin with 30% sodium chloride solution to convert it into Cl - type resin, and then filled into the resin column;

[0038] (3) Send the hydrochloric acid leaching solution containing lithium and iron obtained in step (1) from the top of ...

Embodiment 2

[0048] a kind of Fe 3 o 4 The preparation method of / FeO / C composite material, comprises the following steps:

[0049] (1) Disassemble the waste lithium iron phosphate battery, take out the positive electrode sheet, separate the aluminum foil and the positive electrode material in the positive electrode sheet, and add the collected positive electrode material to a solution of 1mol / L hydrochloric acid and 30% H 2 o 2 solution (the volume ratio of the two is 2:1), leaching in an open container at 80°C for 0.5h, and standing at room temperature for 4h, to obtain a hydrochloric acid leachate containing lithium and iron; after determination, the iron in the effluent , The concentration of lithium is 20g / L and 5g / L;

[0050] (2) Pretreat the D390 anion exchange resin with 40% sodium chloride solution to convert it into Cl - type resin, and then filled into the resin column;

[0051] (3) Send the hydrochloric acid leaching solution obtained in step (1) from the top of the resin ...

Embodiment 3

[0059] a kind of Fe 3 o 4 The preparation method of / FeO / C composite material, comprises the following steps:

[0060] (1) Disassemble the waste lithium iron phosphate battery, take out the positive electrode sheet, separate the aluminum foil and the positive electrode material in the positive electrode sheet, and add the collected positive electrode material to a solution of 4mol / L hydrochloric acid and 30%H 2 o 2 solution (the volume ratio of the two is 2:1), leaching in an open container at 40°C for 3h, and standing at room temperature for 4h, to obtain a hydrochloric acid leachate containing lithium and iron; The concentration of lithium is 12g / L and 2g / L;

[0061] (2) Pretreat the 717 type anion exchange resin with 10% sodium chloride solution to convert it into Cl - type resin, and then filled into the resin column;

[0062] (3) Send the hydrochloric acid leaching solution obtained in step (1) from the top of the resin column at a flow rate of 2.5L / h, collect the ef...

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Abstract

The invention discloses a Fe3O4 / FeO / C composite material, and a preparation method and application thereof. Anion exchange resin is adopted to separate iron and lithium in the hydrochloric acid leaching solution of the positive electrode material of the waste lithium iron phosphate battery, the lithium remains in the effluent and is used for preparing high-purity lithium salt, and the iron is enriched in the resin. And the resin waste which adsorbs iron to be saturated at the temperature of 400-1000 DEG C is calcined to prepare the Fe3O4 / FeO / C composite material which can be used as a negative electrode material of a lithium ion battery. According to the method, carbon sources and metal salts do not need to be additionally added in the composite material preparation process, the resin is rich in source and low in price, the material preparation process is simple and short in flow, and the prepared composite material is excellent in electrochemical performance. The method provided by the invention realizes efficient recovery of iron and lithium in the waste lithium iron phosphate battery and secondary utilization of iron and resin, and has remarkable economic benefits.

Description

technical field [0001] The invention relates to the technical field of recycling of lithium-ion batteries and the preparation of battery negative electrode materials, specifically a Fe 3 o 4 / FeO / C composite material and its preparation method and application. Background technique [0002] Lithium iron phosphate batteries have the advantages of high energy density and long cycle life, and are widely used in household appliances, portable electronic devices, electric vehicles and other fields. However, lithium iron phosphate batteries have a certain service life, usually about 3-5 years. With the increasing market demand and sales volume of lithium-ion batteries, a large number of waste lithium iron phosphate batteries are produced. The leakage of heavy metals such as electrolyte and copper in waste lithium iron phosphate batteries will seep into garbage and soil, causing serious pollution to the environment. However, valuable metals such as iron and lithium contained in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M4/36H01M4/52H01M4/583H01M10/0525
CPCH01M10/54H01M4/362H01M4/52H01M4/583H01M10/0525H01M2004/027Y02W30/84Y02E60/10
Inventor 刘葵史莹潘齐常郑锋华胡思江黄有国
Owner GUANGXI NORMAL UNIV
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