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Preparation method of anode material for lithium-ion battery prepared by anthracite

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, and insufficient bonding, and achieve high and low temperature resistance. , low thermal expansion coefficient and compact structure

Active Publication Date: 2012-04-25
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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  • Preparation method of anode material for lithium-ion battery prepared by anthracite
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  • Preparation method of anode material for lithium-ion battery prepared by anthracite

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Embodiment 1

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

[0034] A method for preparing aphanitic graphite negative electrode materials for lithium-ion batteries from anthracite, comprising the steps of:

[0035] (1) Select the anthracite whose Vdaf% is 0-7.5, Hdaf% is 0-4, 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. Crushed and classified by ball mill, the particle size distribution D50 is 0-30mm, and the tap density is 0.8g / cm 3 powdered anthracite precursor, and then with a density of 1g / cm 3 The mixture of magnetite powder and water is dense medium coal preparation, which washes out anthracite with a carbon content of more than 93%, a calorific value of more than 7000 kcal...

Embodiment 2

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

[0040] The preparation method of the lithium ion battery negative electrode material prepared with anthracite, it comprises the steps:

[0041](1) Select the anthracite whose Vdaf% is 0-7.5, Hdaf% is 0-4, 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, the particle size distribution D50 is 0-30mm, and the tap density is 1.0g / cm 3 powdered anthracite precursor, and then with a density of 1.5g / cm 3 The mixture of magnetite powder and water is dense medium coal preparation, which washes out anthracite with a carbon content of more than 93%, a calorific value of more than 7000 kcal, ...

Embodiment 3

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

[0046] The preparation method of the lithium ion battery negative electrode material prepared with anthracite, it comprises the steps:

[0047] (1) Select the anthracite whose Vdaf% is 0-7.5, Hdaf% is 0-4, 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 0.9g / cm 3 powdered anthracite precursor, and then use a density of 1 ~ 1.5g / cm 3 The mixture of magnetite powder and water is dense medium coal preparation, which washes out anthracite with a carbon content of more than 93%, a calorific value of more than 7000 kcal...

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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 lithium ion battery negative electrode material prepared from anthracite and a preparation method thereof. Background technique [0002] At present, there are two types of carbon anode materials for lithium-ion batteries in China: artificial graphite and natural graphite. Artificial graphite includes mesocarbon microspheres (MCMB), mesocarbon fiber (MCF) and artificial graphite powder. The first two types of artificial graphite are widely used anode materials, which have the advantages of good particle shape, low irreversible capacity loss, and stable cycle, but also have the disadvantages of low discharge capacity and high preparation cost. The discharge capacity of mesophase carbon 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 and excellent intercalation-deintercalation properties, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/1393
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 梁国强
Owner LUOYANG YUEXING NEW ENERGY TECH
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