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Anode material for lithium-ion battery prepared by anthracite and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high preparation cost of graphite-based negative electrode materials, uneven SEI film, SEI film damage, etc., and achieve high and low temperature resistance. , low thermal expansion coefficient, and strong intermolecular bonding

Active Publication Date: 2011-06-29
LUOYANG YUEXING NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the preparation cost of graphite-based negative electrode materials is high, the formed SEI film is uneven, and the combination with carbon materials is not tight enough, which will easily cause damage to the SEI film in the subsequent cycle process and deteriorate battery performance. A preparation method of aphanitic graphite prepared from low-cost anthracite for negative electrode material of lithium ion battery

Method used

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  • Anode material for lithium-ion battery prepared by anthracite and preparation method thereof
  • Anode material for lithium-ion battery prepared by anthracite and preparation method thereof
  • Anode material for lithium-ion battery prepared by anthracite and preparation method thereof

Examples

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Embodiment 1

[0033] A negative electrode material for lithium ion batteries prepared from anthracite coal. Its particle size distribution D10 is 6-10μm, D50 is 17-20μm, D90 is 28-50μm, and tap density is 0.9g / cm 3 , The carbon content is 97%, and the graphitization degree is 87%.

[0034] The preparation method of using anthracite to prepare cryptocrystalline graphite negative electrode material for lithium ion battery includes the following steps:

[0035] (1) Select the anthracite with Vdaf% in the range of 0 to 7.5, Hdaf% in the range of 0 to 4, the average maximum reflectance of vitrinite is higher than 6%, and the dry ash-free base high calorific value is lower than 22% MJ / KG. Crush and classify with a ball mill to obtain a particle size distribution D50 of 0-30mm and a tap density of 0.8g / cm 3 Powdered anthracite precursor, and then used with a density of 1g / cm 3 The mixture of magnetite powder and water is used for heavy-medium coal separation. Anthracite with a carbon content of 93% or m...

Embodiment 2

[0039] A negative electrode material for lithium ion batteries prepared from anthracite coal. Its particle size distribution D10 is 6-10μm, D50 is 17-20μm, D90 is 35-50μm, and its tap density is 1.1g / cm 3 , The carbon content is 98.0%, and the graphitization degree is 90%.

[0040] A preparation method of a negative electrode material for lithium ion batteries prepared from anthracite coal includes the following steps:

[0041] (1) Select the anthracite with Vdaf% in the range of 0 to 7.5, Hdaf% in the range of 0 to 4, the average maximum reflectance of vitrinite is higher than 6%, and the dry ash-free base high calorific value is lower than 22% MJ / KG. Crush and classify with a ball mill to obtain a particle size distribution D50 of 0-30mm, and a tap density of 1.0g / cm 3 The powdered anthracite precursor body, then used with a density of 1.5g / cm 3 The mixture of magnetite powder and water is used for heavy medium coal separation. Anthracite with a carbon content of 93% or more, a ca...

Embodiment 3

[0045] A negative electrode material for lithium ion batteries prepared from anthracite coal. Its particle size distribution D10 is 6-10μm, D50 is 17-20μm, D90 is 35-50μm, and its tap density is 1.2g / cm 3 , The carbon content is 98.5%, and the graphitization degree is 92%.

[0046] The method for preparing negative electrode material for lithium ion battery prepared from anthracite coal includes the following steps:

[0047] (1) Select the anthracite whose Vdaf% is between 0 and 7.5, Hdaf% is between 0 and 4, the average maximum reflectance of vitrinite is higher than 6%, and the dry ash-free base heat is lower than 22% MJ / KG. Crush and classify with a ball mill to obtain a particle size distribution D50 of 0-30mm, and a tap density of 0.9g / cm 3 The powdery anthracite precursor body, and then use the density of 1~1.5g / cm 3 The mixture of magnetite powder and water is used for heavy medium coal separation. Anthracite with a carbon content of 93% or more, a calorific value of more tha...

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Abstract

The invention discloses an anode material for a lithium-ion battery prepared by anthracite, the particle size distribution D10 is 6-10 mu m, D50 is 17-20 mu m and D90 is 28-50 mu m, the tap density is 0.8-1.6g / cm3, the carbon content is 93.0-99.99%, and the graphitization degree is 85-97%. The anode material for the lithium-ion battery prepared by the anthracite has the characteristics of high gram specific capacity, strong intermolecular bonding force, low thermal expansion coefficient, good high and low temperature resistance, long cycle life, high compacted density of pole pieces and the like.

Description

Technical field [0001] The invention relates to a negative electrode material for lithium ion batteries prepared from anthracite coal and a preparation method thereof. Background technique [0002] At present, there are two types of carbon anode materials used in the production of lithium ion batteries in China: artificial graphite and natural graphite. Artificial graphite includes mesophase carbon microspheres (MCMB), mesophase carbon fibers (MCF) and artificial graphite powder. The first two kinds of artificial graphite are widely used negative electrode materials, which have the advantages of good particle shape, low irreversible capacity loss, and stable cycle. However, they also have the disadvantages of low discharge capacity and high production cost. The discharge capacity of mesocarbon microspheres is generally about 320mAh / g, and the preparation cost is relatively high, which limits its application in power batteries. Natural graphite has a low intercalation potential a...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/1393
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 梁国强
Owner LUOYANG YUEXING NEW ENERGY TECH
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