Modification method of natural graphite ball-milling machinery and modified natural graphite anode material

A technology of natural graphite and negative electrode material, applied in the direction of graphite, battery electrodes, electrical components, etc., can solve the problems of undisclosed first discharge efficiency, irreversible capacity and cycle performance, poor high current charge and discharge performance, and poor electrolyte compatibility. and other problems, to achieve the effect of high cost performance, environmentally friendly production methods and low cost

Inactive Publication Date: 2014-05-21
BTR NEW MATERIAL GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of natural graphite as a negative electrode material for lithium-ion batteries are: (1) poor compatibility with the electrolyte, prone to peeling off of the graphite layer due to the co-intercalation of solvated lithium ions, resulting in irreversible capacity, which ultimately affects its cycle performance ; (2) Poor high-current charging and discharging performance
The method can greatly improve the shape of the material, increase its tap density and improve the processing performance during electrode processing, ensure the batch stability of the product, improve the yield of the material, and reduce the production cost, but it does not disclose Its effect on the first discharge efficiency, irreversible capacity and cycle performance

Method used

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  • Modification method of natural graphite ball-milling machinery and modified natural graphite anode material
  • Modification method of natural graphite ball-milling machinery and modified natural graphite anode material
  • Modification method of natural graphite ball-milling machinery and modified natural graphite anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 1 kg of natural spherical graphite powder with an average particle size of 16 to 19 μm and a carbon content of ≥99.95%, 0.25 L of water and 2 kg of zirconia balls into the ball mill pot, set the ball mill’s rotation speed to 100 rpm and revolution speed to 50 rpm points, ball milled for 10min. After ball milling, the circulating water type multipurpose vacuum pump is used for suction filtration to remove the filtrate. The filter residue is dried in an electric blast drying oven, and then sieved to obtain a ball-milled mechanically modified natural graphite negative electrode material.

Embodiment 2

[0042] Add 0.5 kg of natural spherical graphite powder with an average particle size of 16 to 19 μm and a carbon content of ≥99.95%, 0.625 L of water and 3 kg of zirconia balls into the ball mill tank, and set the rotation speed of the ball mill to 50 rpm and revolution speed to 50 rpm / min, ball milled for 30min. After ball milling, the circulating water type multipurpose vacuum pump is used for suction filtration to remove the filtrate. The filter residue is dried in an electric blast drying oven, and then sieved to obtain a ball-milled mechanically modified natural graphite negative electrode material.

Embodiment 3

[0044] Add 0.8kg of natural spherical graphite powder with an average particle size of 16-19μm and a carbon content of ≥99.95%, 1L of water and 2kg of zirconia balls into the ball mill pot, set the ball mill’s rotation speed to 300 rpm and revolution speed to 120 rpm points, ball milled for 10min. After ball milling, the circulating water type multipurpose vacuum pump is used for suction filtration to remove the filtrate. The filter residue is dried in an electric blast drying oven, and then sieved to obtain a ball-milled mechanically modified natural graphite negative electrode material.

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Abstract

The invention relates to a modification method of natural graphite ball-milling machinery and a modified natural graphite negative electrode material. The method comprises the following steps: adding grinding balls, a ball-milling medium and graphite powder into a ball-milling tank according to a mass ratio of (0.5-20):(0.1-10):1, performing ball milling on ball-milling equipment for 2-120 minutes according to a rotating speed of not more than 600 revolutions per minute, removing the ball-milling medium, and drying. The method can achieve the aims of improving the first discharge efficiency of natural graphite, reducing the irreversible capacity and improving the cycle performance of natural graphite through a low-cost ball-milling machinery modification technology.

Description

technical field [0001] The invention relates to the technical field of graphite materials, in particular to a method for modifying natural graphite negative electrode materials for lithium-ion batteries, in particular to a natural graphite ball milling mechanical modification method and modified natural graphite negative electrode materials. Background technique [0002] As an anode material for lithium-ion batteries, natural graphite has the advantages of abundant resources, low price, high theoretical capacity, high compaction density, and high and stable working voltage of lithium-ion batteries. The disadvantages of natural graphite as a negative electrode material for lithium-ion batteries are: (1) poor compatibility with the electrolyte, prone to peeling off of the graphite layer due to the co-intercalation of solvated lithium ions, resulting in irreversible capacity, which ultimately affects its cycle performance ; (2) Poor performance of high current charging and disc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587C01B31/04
CPCC01B32/20H01M4/5835H01M10/0525Y02E60/10C01P2002/74C01P2002/78C01P2004/61C01P2006/11C01P2006/12C01B32/21H01M4/587
Inventor 岳敏周海辉苗恒任建国黄友元
Owner BTR NEW MATERIAL GRP CO LTD
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