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Method for producing lithium ion battery positive material coated with carbon

A lithium-ion battery, cathode material technology, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve the problems of low electronic conductivity, affect the electrochemical performance of high current and practical application, etc., achieve large specific surface area, large current The effect of excellent chemical properties and simple process flow

Inactive Publication Date: 2009-09-02
SHENZHEN UNIV
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AI Technical Summary

Problems solved by technology

However, these materials have a common disadvantage, that is, the intrinsic electronic conductivity of the battery cathode material itself is very low, which seriously affects the high-current electrochemical performance and practical application of the material.

Method used

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Examples

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Effect test

preparation example Construction

[0014] The present invention provides a kind of preparation method of lithium-ion battery cathode material coating carbon, and its specific process step is as follows:

[0015] Put a certain amount of lithium-ion battery cathode material powder into polyacrylonitrile solution, stir and mix well, heat and evaporate the solvent, put it in an oven under air atmosphere and heat at 150-300°C for 2-4 hours to obtain Put the obtained black solid into a high-temperature furnace and heat at 400-1200° C. for 0.5-4 hours under the protection of an inert gas to obtain a lithium-ion battery powdery positive electrode material coated with carbon on the surface.

[0016] The above-mentioned lithium-ion battery cathode material is LiCoO 2 、LiFePO 4 , LiNiO 2 , LiV 3 o 8 , LiMn 2 o 4 Or use one or several metal elements in Mg, Ti, Cr, Al, Cu, Ag, Zr, Nb, W to partially replace Co, Fe, Ni, V, Mn in the above composite oxides. The compound; the molecular weight of polyacrylonitrile is 100...

Embodiment 1

[0019] 1g LiCoO 2 The powder is put into 2.5g of 20% polyacrylonitrile (molecular weight: 1500) solution (mass percentage), fully stirred and mixed, after heating and evaporating the solvent, in an air atmosphere, put it into an oven and heat at 200°C for 3 hours to obtain Then put the obtained black solid into a high-temperature furnace and heat it at 750°C for 1 hour under the protection of nitrogen to obtain LiCoO coated with carbon on the surface. 2 Powdery cathode material. Active material: acetylene black: adhesive is equal to the ratio (mass percentage) of 85:10:5 to mix positive electrode film, with lithium sheet as negative electrode, with Cellgard 2300 porous film as separator, with 1mol / L LiPF 6 / EC+DMC (volume ratio 1:1) mixed solution as electrolyte, assembled into a button battery. The electrochemical performance test was carried out on a Land BS9300 (Wuhan Jinnuo Electronics) program-controlled automatic electrochemical tester. When the current density is 1C,...

Embodiment 2

[0021] 1g LiFePO 4 Put the powder into 1.5g of 50% polyacrylonitrile (molecular weight: 1000) solution (mass percentage), fully stir and mix, after heating and evaporating the solvent, put it in an oven and heat at 160°C for 2 hours in an air atmosphere. A black solid is obtained, and then the obtained black solid is put into a high-temperature furnace, and heated at 550°C for 1.5 hours under the protection of argon to obtain LiFePO coated with carbon on the surface. 4 Powdery cathode material. Active material: acetylene black: adhesive is equal to the ratio (mass percentage) of 80:10:10 to make positive electrode film, with lithium sheet as negative electrode, with Cellgard 2300 porous membrane as diaphragm, with 1mol / L LiPF 6 / EC+DMC (volume ratio 1:1) mixed solution as electrolyte, assembled into a button battery. The electrochemical performance test was carried out on a Land BS9300 (Wuhan Jinnuo Electronics) program-controlled automatic electrochemical tester. When the ...

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Abstract

The invention relates to a method for producing a lithium ion battery positive material coated with carbon. The method comprises the following steps: a certain amount of lithium ion battery positive material powder is put into polyacrylonitrile solution, the solution is sufficiently stirred and uniformly mixed, after being heated and evaporated, the solution is placed into an oven at an air atmosphere to be heated for 2-4 hours under 150-3000 DEG C so as to obtain black solids, the black solids are placed into a high temperature furnace to be heated for 0.5-4 hours at the temperature of 400-1200 DEG C under the protection of inert gas so as to obtain powdery lithium ion battery positive material coated with carbon on the surface. The lithium ion battery positive material coated with carbon has the advantages of fine particle, uniform carbon coating, good electric conductivity, high specific capacity and good recycling property and has great using value in the field of power type lithium ion batteries.

Description

technical field [0001] The invention relates to a method for preparing a lithium-ion battery anode material-coated carbon, and belongs to the technical field of energy material and new material preparation. Background technique [0002] Lithium-ion batteries are a new generation of green high-energy batteries, which have the advantages of light weight, high volume specific energy, high working voltage, and no environmental pollution. They are ideal for modern communications, IT and portable electronic products (such as mobile phones, notebook computers, cameras, etc.) The ideal chemical power source is also the preferred power source for electric vehicles in the future, with broad application prospects and huge economic benefits. [0003] Cathode material is the key material for manufacturing lithium-ion secondary batteries, and is the main factor determining the performance and price of lithium-ion batteries. Therefore, the research and development of cathode materials for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/62
CPCY02E60/12Y02E60/10
Inventor 任祥忠张培新刘剑洪张黔玲
Owner SHENZHEN UNIV
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