Modified method for lithium ion cell negative electrode material

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve problems such as inability to adapt to high-current power batteries, materials cannot be used at the same time, cyclability and capacity defects, etc. Volume expansion and pulverization effect, good battery kinetics, large aspect ratio effect

Inactive Publication Date: 2006-08-02
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of capacity and cycle performance, these materials often cannot have both
However, currently widely used commercial lithium-ion battery negative electrode materials mainly use mesophase carbon mi

Method used

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  • Modified method for lithium ion cell negative electrode material
  • Modified method for lithium ion cell negative electrode material
  • Modified method for lithium ion cell negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] Select natural graphite balls with an average diameter of 20μm (mass 2g) ( Figure 1a ), add Fe powder as a catalyst (mass 0.046g), mix evenly, use C 2 H 4 The carbon source is mixed with Ar in a volume ratio of 1:1, and then passed into a reaction furnace at a temperature of 1000°C. After 100 minutes of reaction, a modified composite of carbon nanofibers / carbon tubes grown in situ on the surface is obtained Anode material ( Figure 1b ). Used as a negative electrode material for lithium-ion batteries. The test results of conventional lithium ion battery negative electrode evaluation methods show that the capacity and cycle performance have been greatly improved under the same number of cycles ( figure 2 ).

Example Embodiment

[0028] Example 2

[0029] Choose natural graphite balls with an average diameter of 20μm (mass 2g), add Fe(NO 3 ) 3 As a catalyst (mass 0.198g), natural graphite balls can be added to Fe(NO 3 ) 3 After the solution is evenly mixed, dry it and use CH 4 Do carbon source and N 2 The mixture was mixed in a ratio of 2:1 by volume, and passed into a reaction furnace at a temperature of 700°C. After 60 minutes of reaction, a modified composite negative electrode material with carbon nanofibers / carbon tubes grown in situ on the surface was obtained. Used as a negative electrode material for lithium-ion batteries. The test results of conventional lithium-ion battery negative electrode evaluation methods show that under the same number of cycles, the capacity and cycle performance have been greatly improved.

Example Embodiment

[0030] Example 3

[0031] Choose natural graphite balls with an average diameter of 20μm (mass 2g), add Fe(NO 3 ) 3 As a catalyst (mass 0.084g), natural graphite balls can be added to Fe(NO 3 ) 3 After the solution is evenly mixed, dry it and use CH 4 Do carbon source and N 2 The mixture was mixed in a ratio of 9:1 by volume and passed into a reaction furnace at a temperature of 700°C. After 240 minutes of reaction, a modified composite negative electrode material with carbon nanofibers / carbon tubes grown in situ on the surface was obtained. Used as a negative electrode material for lithium-ion batteries. The test results of conventional lithium-ion battery negative electrode evaluation methods show that under the same number of cycles, the capacity and cycle performance have been greatly improved.

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Abstract

This invention relates to a kind of improving method of lithium ionic cell cathode materials. The cathode materials in need of improving are mixed evenly with catalyst which has 0.1úÑ-10úÑ weight percent of cathode materials. The materials are then put into reaction furnace, which uses hydrocarbon as carbon source. The cathode materials are mixed with buffer gas according to 1í†(0-10) volume ratio. Then the mixture are reacted in reaction furnace at 600-1300íµ for 1-900 minutes. A kind of improved composite cathode materials, at the surface of which in-situ grows nanometer carbon fibrin/ carbon tube, are gained. The improved materials have good cell kinetic ability, circulating ability, charge-discharge capacity and consistency with electrolyte.

Description

technical field [0001] The invention relates to a negative electrode material technology of a rechargeable secondary lithium ion battery, in particular to a modification method of the negative electrode material of the lithium ion battery, which can significantly improve the cycle performance, capacity and other performances of the rechargeable secondary lithium ion battery. Background technique [0002] Rechargeable secondary lithium-ion batteries have become a hot spot in the battery industry in recent years because of their advantages such as high voltage, long discharge time, high energy density, light weight, no memory effect and no pollution. The application fields of lithium-ion batteries are rapidly expanding: they are widely used in portable electronic products (such as supporting power supplies for mobile phones, notebook computers, digital cameras, etc.); electric vehicle industry; military equipment field; aerospace field, etc. Especially in recent years, with th...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/58H01M4/62H01M10/38H01M4/38
CPCY02E60/10
Inventor 成会明张宏立李峰刘畅张旭刚张勇
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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