Lithium ion battery anode material with porous structure and preparation method of lithium ion battery anode material

A lithium-ion battery and anode material technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve problems affecting natural graphite, natural graphite high-current charge-discharge performance, poor cycle stability, and affecting cycle stability, etc.

Inactive Publication Date: 2015-11-11
乌兰察布市大盛石墨新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flake graphite sheet structure is relatively regular, which is conducive to the insertion and extraction of lithium ions, and the reversible capacity can reach 300~350mAh/g. However, due to the expansion and contraction of the charge and discharge process between the s

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A lithium ion battery negative electrode material of porous structure, its raw material is natural spherical graphite and coal tar pitch, and described natural spherical graphite is the natural flake graphite that produces from Xinghe County, Ulanqab City, Inner Mongolia Autonomous Region, and the pore-forming agent content is 6%, the composition of the pore-forming agent is composed of 15% calcium oxide, 70% silicon oxide, 10% ferric oxide, 5% molybdenum oxide, and coal tar pitch is medium temperature pitch;

[0024] A preparation method of a lithium-ion battery negative electrode material with a porous structure, specifically as follows:

[0025] (1) The natural flake graphite is spheroidized and shaped, and the D50 of the shaped spherical graphite is 6 μm;

[0026] (2) Spherical graphite is graphitized in a graphitization furnace at 2800°C. The obtained high-purity porous spherical graphite has a fixed carbon content of 99.9% and a graphitization degree of 92%;

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Embodiment 2

[0032] A lithium-ion battery negative electrode material with a porous structure, its raw materials include natural spherical graphite and phenolic resin powder, the natural spherical graphite is natural flake graphite produced in Jixi City, Heilongjiang Province, and the content of pore-forming agent is 8%. The composition of the porogen is composed of 22% calcium oxide, 65% silicon oxide, 5% magnesium oxide, 8% ferric oxide, and industrial grade phenolic resin.

[0033] A preparation method of a porous lithium-ion battery negative electrode material, characterized in that it comprises the following steps:

[0034] (1) Spheroidize and reshape the natural flake graphite, and the D50 of the reshaped spherical graphite is 15 μm;

[0035] (2) Spherical graphite is graphitized in a graphitization furnace at 2000°C. The obtained high-purity porous spherical graphite has a fixed carbon content of 99.9% and a graphitization degree of 94%;

[0036] (3) The phenolic resin is coated on...

Embodiment 3

[0041] A lithium-ion battery negative electrode material with a porous structure, its raw materials include natural graphite and furfural resin, the natural graphite is natural flake graphite produced in Xinghe County, Ulanqab City, Inner Mongolia Autonomous Region, and the content of the pore-forming agent is by mass percentage The composition of the pore-forming agent is composed of 10% calcium oxide, 50% silicon oxide, 10% magnesium oxide, 20% ferric oxide, 6% copper oxide, and 4% molybdenum oxide. class.

[0042] A preparation method of a porous lithium-ion battery negative electrode material, characterized in that it comprises the following steps:

[0043](1) The natural flake graphite is spheroidized and shaped, and the D50 of the shaped spherical graphite is 22 μm;

[0044] (2) Spherical graphite is graphitized in a graphitization furnace at 3200°C. The obtained high-purity porous spherical graphite has a fixed carbon content of 99.9% and a graphitization degree of 95%...

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PUM

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Abstract

The invention discloses a lithium ion battery anode material with a porous structure and a preparation method of the lithium ion battery anode material. The raw material is spherical flake graphite and a coating precursor. The preparation method is characterized by comprising the following steps: by the pore-forming action of pore-forming agents, such as silicon oxide, calcium oxide, magnesium oxide, ferroferric oxide, copper oxide and molybdenum oxide, naturally existing in the spherical flake graphite in a high-temperature treatment process, preparing high-purity spherical graphite with a certain pore structure; and carrying out surface coating with resin materials such as asphalt, emulsified asphalt, phenolic resin, furfural resin and epoxy resin, and carrying out carbonization, crushing and screening to obtain the final anode material. Compared with a traditional technology, the anode material prepared by the method has the advantages of high capacity, good cycling stability and the like; the raw materials used by the technology are abundant; the preparation technology is simple; and the lithium ion battery anode material is suitable for large-scale production and has great commercial value.

Description

technical field [0001] The invention relates to the field of preparation of negative electrode materials for lithium ion batteries, in particular to a negative electrode material for lithium ion batteries prepared by modification of natural spherical flake graphite and a preparation method thereof. Background technique [0002] Since Sony first launched lithium-ion batteries on the market in 1990, lithium-ion batteries have unique advantages compared with nickel-hydrogen nickel-cadmium rechargeable batteries, such as high specific energy, high operating voltage, long charge and discharge life, No memory effect, less environmental pollution, low self-discharge rate, etc., quickly occupied the market of commercial rechargeable batteries, especially as the power supply of small portable electrical appliances such as mobile phones, notebook computers, and digital cameras. In recent years, the research and application of positive and negative electrode materials and electrolyte s...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/36H01M10/0525
CPCH01M4/364H01M4/587H01M10/0525Y02E60/10
Inventor 时迎迎王恩平黄旭
Owner 乌兰察布市大盛石墨新材料股份有限公司
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