Preparation method of lithium iron phosphate/double carbon layer coated composite material

A technology of lithium iron phosphate and composite materials, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of low carbon content, unsatisfactory electronic conductivity of materials, and difficulties, so as to increase the secondary particle size and shorten the The effect of beating aging and improving electronic conductivity

Inactive Publication Date: 2017-06-13
OPTIMUM BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, due to factors such as the particle size, microscopic morphology, crystal structure, type and content of doping and coating substances of lithium iron phosphate particles, it is difficult to achieve the desired effect through a single improvement method, such as carbon coating to improve lithium iron phosphate , it is difficult to obtain a uniform and complete carbon coating layer, and the carbon content of a single layer of carbon coating is low, and the electronic conductivity of the material is not ideal.

Method used

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  • Preparation method of lithium iron phosphate/double carbon layer coated composite material
  • Preparation method of lithium iron phosphate/double carbon layer coated composite material
  • Preparation method of lithium iron phosphate/double carbon layer coated composite material

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preparation example Construction

[0029] The invention provides a method for preparing a lithium iron phosphate / double carbon layer coated composite material, comprising the following steps:

[0030] Step 1: Prepare iron source, phosphorus source and lithium source with a certain material ratio, mix evenly, add reducing agent and dissolve, then add mesoporous carbon (CMK-3), and perform ultrasonic stirring to obtain the first mixed solution ;

[0031] Step 2: Transfer the first mixed solution obtained in Step 1 to the reaction kettle, carry out hydrothermal reaction, cool to room temperature after the reaction, wash and dry the reaction product to obtain a lithium iron phosphate / carbon-doped composite Material;

[0032] Step 3: Place the lithium iron phosphate / carbon-doped composite material obtained in step 2 in a tube furnace under the protection of an inert gas. After the first high-temperature calcination, take it out after cooling, wash and dry to obtain the primary Lithium iron phosphate / double carbon ...

Embodiment 1

[0047] 1. The concentration ratio of the prepared substance is 1:1:3 FeSO 4 ·H 2 O, H 3 PO 4 Mix equal volumes of LiOH and LiOH into a beaker, add 1.8g glucose under magnetic stirring, add 1.25g mesoporous carbon CMK-3 after dissolution, and stir ultrasonically for 30min to make it evenly dispersed.

[0048] 2. Transfer the uniformly dispersed solution obtained in step 1 to a reaction kettle, conduct a hydrothermal reaction at 130°C for 8 hours, cool to room temperature after the reaction, wash the reaction product, and dry it by blasting to obtain a lithium iron phosphate / carbon doped composite material .

[0049] 3. Place the lithium iron phosphate / carbon-doped composite material obtained in step 2 in a tube furnace, under the protection of nitrogen, calcinate at 750°C for 2 hours, take it out after cooling, wash with deionized water and absolute ethanol several times, The primary lithium iron phosphate / double carbon layer clad composite material is obtained by drying. ...

Embodiment 2

[0052] 1. The concentration ratio of the prepared substance is 1:1:3 FeSO 4 ·H 2 O, H 3 PO 4 Mix equal volumes of LiOH and LiOH into a beaker, add 2.1g citric acid under magnetic stirring, add 1.50g mesoporous carbon CMK-3 after dissolution, and ultrasonically stir for 30min to make it evenly dispersed.

[0053] 2. Transfer the uniformly dispersed solution obtained in step 1 to a reaction kettle, conduct a hydrothermal reaction at 150°C for 10 hours, cool to room temperature after the reaction, wash the reaction product, and dry it with air to obtain a lithium iron phosphate / carbon doped composite material .

[0054] 3. Put the lithium iron phosphate / carbon-doped composite material obtained in step 2 in a tube furnace, under the protection of nitrogen, calcinate at 750°C for 4 hours, take it out after cooling, wash with deionized water and absolute ethanol several times, Dry the lithium iron phosphate / double carbon layer cladding composite material.

[0055] 4. Weigh 1.8g...

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Abstract

The invention provides a preparation method of a lithium iron phosphate / double carbon layer coated composite material. The preparation method comprises the following steps of: S1, preparing an iron source, a phosphorus source and a lithium source in a certain ratio of amount of substance, adding a reducing agent to stir, then adding mesoporous carbon, and performing ultrasonic stirring; S2, transferring a mixed liquid prepared in the S1 to a reaction kettle, performing a hydrothermal reaction, reducing the temperature to room temperature after reaction, and washing, blowing and drying the reaction product to obtain a composite material; S3, putting the composite material in a tubular furnace for first time high-temperature calcining, cooling the composite material and taking out the same, and washing and drying the same; and S4, dissolving an additive in absolute ethyl alcohol, adding the composite material prepared in the S3, stirring the mixture to prepare a second mixed liquid, putting the second mixed liquid in an oven to be dried, fully evaporating a solvent, putting the obtained product under protection of inert gas for second time high-temperature calcining, and cooling, washing and drying the product to obtain the secondarily granulated lithium iron phosphate / double carbon layer coated composite material.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of battery materials, in particular to a preparation method of a lithium iron phosphate / double carbon layer coated composite material. [0003] 【Background technique】 [0004] Lithium iron phosphate (LiFePO 4 ) as a positive electrode material for lithium-ion power batteries has the advantages of wide source of raw materials, non-toxicity, high theoretical specific capacity (170mAh / g), long cycle life, and good safety performance. However, the lithium ion diffusion coefficient of lithium iron phosphate itself is low , poor electronic conductivity, and serious capacity loss when working at low temperature, hindering its further application. [0005] At present, there are three main aspects to improve the low-temperature performance of lithium iron phosphate: 1. Surface modification, coating excellent electronic conductors (such as carbon, metal, metal oxides, conductive polymers) or fast ion conducto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/362H01M4/623Y02E60/10
Inventor 伍伟焦奇方饶睦敏李瑶
Owner OPTIMUM BATTERY CO LTD
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