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Preparing method of negative materials for lithium ion batteries

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of unstable performance, low specific capacity, non-uniform growth of nanofibers, etc. Specific surface area, the effect of reducing irreversible capacity

Inactive Publication Date: 2012-08-22
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN101604750 discloses a preparation method of lithium ion battery negative electrode material, the preparation method is simple, the cycle performance is relatively stable, but the specific capacity is low
ACS NANO 20112787-2794, a journal of the American Chemical Society, discloses another composite material of graphene and carbon nanofibers. In a fluidized reactor, the lithium-ion battery negative electrode material prepared by controlling the temperature and the flow and time of carbon-containing gas has Better energy density and power density, but nanofibers cannot grow uniformly, so the performance is not stable

Method used

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  • Preparing method of negative materials for lithium ion batteries
  • Preparing method of negative materials for lithium ion batteries
  • Preparing method of negative materials for lithium ion batteries

Examples

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Embodiment 1

[0016] Example 1: (1) Add 1g of chemical liquid-phase reduced graphene powder to 50ml of a mixed solution of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, reflux and stir in a water bath at 80°C for 1 hour, and then let stand 12h. Wash with deionized water until the solution is neutral, and obtain graphene powder carrying carboxyl functional groups by ultrasonication for 2 hours.

[0017] (2) 2g MgCl 2 Dissolve in water, add the graphene powder carrying carboxyl functional groups obtained in step (1), ultrasonically disperse, and evaporate the solvent to obtain MgCl-containing 2 Graphene powder carrying carboxyl functional groups (material A for short).

[0018] (3) At 1000°C, sinter the product of step (2) (material A) for 5 minutes to obtain the sintered graphene powder containing MgO and carrying carboxyl functional groups (abbreviated as material B), and place it in a sealed cavity .

[0019] (4) Vacuumize the sealed cavity, and wh...

Embodiment 2

[0028] Example 2: (1) Add 1g of chemical liquid-phase reduced graphene powder to 50ml of a mixed solution of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, reflux and stir in a water bath at 80°C for 1 hour, and then let stand 12h. Wash with deionized water until the solution is neutral, and obtain graphene powder carrying carboxyl functional groups by ultrasonication for 2 hours.

[0029] (2) 2g MgCl 2 Dissolve in water, add the graphene powder carrying carboxyl functional groups obtained in step (1), ultrasonically disperse, and evaporate the solvent to obtain MgCl-containing 2 Graphene powder carrying carboxyl functional groups (material A for short).

[0030] (3) At 1000°C, sinter the product of step (2) (material A) for 5 minutes to obtain the sintered graphene powder containing MgO and carrying carboxyl functional groups (abbreviated as material B), and place it in a sealed cavity .

[0031](4) Vacuumize the sealed cavity, and whe...

Embodiment 3

[0033] Example 3: (1) Add 1g of chemical liquid-phase reduced graphene powder to 50ml of a mixed solution of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, reflux and stir in a water bath at 80°C for 1 hour, and then let stand 12h. Wash with deionized water until the solution is neutral, and obtain graphene powder carrying carboxyl functional groups by ultrasonication for 2 hours.

[0034] (2) 2g MgCl 2 Dissolve in water, add the graphene powder carrying carboxyl functional groups obtained in step (1), ultrasonically disperse, and evaporate the solvent to obtain MgCl-containing 2 Graphene powder carrying carboxyl functional groups (material A for short).

[0035] (3) At 1000°C, sinter the product of step (2) (material A) for 5 minutes to obtain the sintered graphene powder containing MgO and carrying carboxyl functional groups (abbreviated as material B), and place it in a sealed cavity .

[0036] (4) Vacuumize the sealed cavity, and wh...

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Abstract

The invention relates to a preparing method of negative materials for lithium ion batteries, which is characterized by comprising the steps of adding one mass portion of grapheme powder of chemical liquid phase reduction into a mixed solution of concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 3:1, subjecting the mixture to reflux and stir for 1 hour to 10 hours in a container at a temperature between 50 DEG C and 100 DEG C, allowing the mixture to stand for 10 to 20 hours; washing the mixture with de-ionized water till the solution becomes neutral, and obtaining grapheme powder carrying along a carboxyl functional group through ultrasound for 1 hour to 4 hours; dissolving 0.5 mass portion to 2 mass portions of MgC12 in water, adding the grapheme powder carrying along the carboxyl functional group into the solution, subjecting the solution to ultrasonic dispersion, and drying the solution by distillation to obtain the grapheme powder carrying along the carboxyl functional group and containing MgC12, namely, material A. The preparing method has the advantages that composite materials can fully exploit the advantages of grapheme and carbon nano tubes, and transmission route of lithium ion is effectively shortened by using a 3 D carbon structure formed by using the grapheme and the carbon nano tubes.

Description

technical field [0001] The invention relates to a preparation method of a battery electrode composite material, in particular to a preparation method of a graphene lithium ion battery negative electrode material. Background technique [0002] Such as figure 1 Shown is the basic schematic diagram of the lithium-ion battery reaction. The interior of the lithium-ion battery is composed of four parts: positive electrode, negative electrode, electrolyte and separator. The left side of the schematic diagram is the negative electrode, and the right side is the positive electrode. The positive electrode and the negative electrode are composed of collectors and active materials. M1 is the negative electrode, M1 is the copper foil material, and M2 is the negative electrode material. [0003] Because of its high energy density and power density, electrochemical storage devices are widely used in hybrid electric vehicles and electric vehicles. Lithium-ion batteries have attracted wides...

Claims

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Application Information

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IPC IPC(8): H01M4/38
CPCY02E60/10
Inventor 陈远富黄然王泽高李萍剑贺家瑞张万里李言荣
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA