Modified method for lithium ion cell negative electrode material

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

Inactive Publication Date: 2009-07-08
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 microspheres, modified graphite and other carbonaceous materials, all of which have low charge and discharge rates and cannot meet the requirements of high-current power batteries. Capacity is also flawed

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

Embodiment 1

[0025] Use natural graphite balls (quality 2g) with an average diameter of 20 μm ( Figure 1a ), add Fe powder as catalyst (quality 0.046g), mix evenly, use C 2 h 4 Mix the carbon source and Ar at a volume ratio of 1:1, pass it into a reaction furnace at a temperature of 1000°C, and after 100 minutes of reaction, a modified composite with in-situ growth of nano-carbon fibers / carbon tubes on the surface is obtained. Negative material ( Figure 1b ). It is used as the negative electrode material of lithium ion battery. The detection results of the conventional lithium-ion battery negative electrode evaluation method show that under the same number of cycles, the capacity and cycle performance have been greatly improved ( figure 2 ).

Embodiment 2

[0029] Choose natural graphite balls (mass 2g) with an average diameter of 20 μm, add Fe(NO 3 ) 3 As a catalyst (mass 0.198g), natural graphite balls can be added to Fe(NO 3 ) 3 After mixing evenly in the solution, dry it with CH 4 as carbon source and N 2 Mix according to the volume ratio of 2:1, pass it into a reaction furnace at 700°C, and after 60 minutes of reaction, a modified composite negative electrode material with in-situ growth of nano-carbon fibers / carbon tubes on the surface is obtained. It is used as the negative electrode material of lithium ion battery. The detection results of the conventional lithium-ion battery negative electrode evaluation method show that the capacity and cycle performance have been greatly improved under the same number of cycles.

Embodiment 3

[0031] Choose natural graphite balls (mass 2g) with an average diameter of 20 μm, add Fe(NO 3 ) 3 As a catalyst (mass 0.084g), natural graphite balls can be added to Fe(NO 3 ) 3 After mixing evenly in the solution, dry it with CH 4 as carbon source and N 2 Mix at a volume ratio of 9:1, pass into a reaction furnace at a temperature of 700°C, and react for 240 minutes to obtain a modified composite negative electrode material with in-situ growth of nano-carbon fibers / carbon tubes on the surface. It is used as the negative electrode material of lithium ion battery. The detection results of the conventional lithium-ion battery negative electrode evaluation method show that the capacity and cycle performance have been greatly improved under the same number of cycles.

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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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Patent Type & Authority Patents(China)
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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