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Metal-carbon composite negative electrode material as well as preparation method and application thereof

A negative electrode material and metal technology, applied in the field of high-capacity lithium-ion battery negative electrode material and its preparation, can solve the problems of expensive raw materials, unsuitable production and application, complicated preparation process, etc.

Active Publication Date: 2019-07-26
HUNAN JINYE HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the modification of alloy or metal oxide anode materials in current literature or patents can effectively alleviate the problems of poor electrical conductivity and volume expansion, and improve the electrochemical performance of the battery, there are also complicated preparation processes. , expensive raw materials, high production costs, etc., are not suitable for actual production and application

Method used

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  • Metal-carbon composite negative electrode material as well as preparation method and application thereof
  • Metal-carbon composite negative electrode material as well as preparation method and application thereof
  • Metal-carbon composite negative electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] (1) Select coking coal with ash-free base volatile content of 15%, cohesive index of 52%, maximum thickness of colloidal layer of 25%, contained heteroatoms N, S, P and heteroatom content of 4% as raw material 100g of coking coal raw material dried at 120°C for 10h was put into a vibratory pulverizer for crushing for 1min, then ball milled for 6 hours in a planetary ball mill, sieved with a 500-mesh sieve, and the undersize was taken.

[0077] (2) Add 50 g of dried, crushed and sieved coking coal into a mixed acid solution with a mass ratio of hydrofluoric acid and sulfuric acid of 10:1, the liquid-solid ratio is 4, and the total acid concentration is adjusted to a pH value of 3 at room temperature. The mixture was stirred and reacted for 2 hours, filtered and washed until neutral to obtain acid-purified coke, and the ash content of the purified coke was 0.37%.

[0078] (3) Dissolve 10g of manganese acetate in 100ml of aqueous solution, add 20g of purified coke for ultr...

Embodiment 2

[0081] (1) Select coking coal with ash-free base volatile content of 25%, cohesive index of 62%, maximum thickness of colloidal layer of 25%, contained heteroatoms N, S, P and heteroatom content of 10% as raw material 100g of coking coal raw material dried at 120°C for 12h was put into a vibrating pulverizer for 10min, and then ball milled for 10 hours in a planetary ball mill, sieved with a 500-mesh sieve, and the undersize was taken.

[0082] (2) Add 50 g of dried, crushed and sieved coking coal into a mixed acid solution with a mass ratio of hydrofluoric acid and sulfuric acid of 2:1, the liquid-solid ratio is 6, and the total acid concentration is adjusted to a pH value of 4. The mixture was stirred and reacted for 5 hours, filtered and washed until neutral to obtain coke purified by acid method, and the ash content of the purified coke was 0.42%.

[0083] (3) Dissolve 20g of manganese acetate in 100ml of aqueous solution, add 1g of purified coke for ultrasonic dispersion ...

Embodiment 3

[0086] (1) Select coking coal with ash-free base volatile content of 20%, cohesive index of 58%, colloidal layer maximum thickness of 18%, contained heteroatoms N, S, P and heteroatom content of 8% as raw material 100g of bituminous coal raw material dried at 105°C for 10h was put into a vibratory pulverizer for crushing for 5min, then ball milled for 8 hours in a planetary ball mill, sieved with a 500-mesh sieve, and the undersize was taken.

[0087] (2) Add 50 g of dried, crushed and sieved coking coal into a mixed acid solution with a mass ratio of hydrofluoric acid and sulfuric acid of 10:1, the liquid-solid ratio is 5, and the total acid concentration is adjusted to a pH value of 3 at room temperature. The mixture was stirred and reacted for 5 hours, filtered and washed until neutral to obtain coke purified by acid method, and the ash content of the purified coke was 0.23%.

[0088] (3) Dissolve 10g of manganese acetate in 100ml of aqueous solution, add 50g of purified co...

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Abstract

The invention belongs to the field of battery materials, and particularly relates to a preparation method of a metal-carbon composite negative electrode material; the preparation method comprises thesteps of mixing bituminous coal with a metal source to obtain a mixture; and sequentially performing first-stage sintering, second-stage sintering and third-stage sintering on the mixture to obtain the composite negative electrodes material, wherein the sintering temperature is 300 DEG C or below in the first-stage sintering; the sintering temperature is 400-600 DEG C in the second-stage sintering; and the sintering temperature is 700-1,200 DEG C in the third-stage sintering. The invention also discloses the negative electrode material prepared by adopting the preparation method and an application of the negative electrode material in preparation of a negative electrode of a lithium ion battery. According to the method, bituminous coal is creatively adopted as a raw material; and the raw material is matched with the metal source, and the battery negative electrode material with excellent electrical property can be prepared under the special three-stage sintering mechanism.

Description

technical field [0001] The invention relates to a high-capacity lithium-ion battery negative electrode material and a preparation method thereof, belonging to the field of battery negative electrode materials. Background technique [0002] Lithium-ion batteries have many advantages in terms of energy density, cycle life, scope of application, safety and environmental protection, etc., and are energy conversion and storage devices with great development prospects at this stage. The anode material is one of the key factors affecting its comprehensive performance, which has been extensively and deeply studied. Currently, it has been reported that the types of anode materials for lithium-ion batteries mainly include carbon materials, alloy materials, and metal oxide materials. Among them, graphite-like carbon is the main commercial anode material, which has stable performance but low specific capacity; both alloy anode materials and oxide anode materials have the advantages of ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M4/04H01M10/0525
CPCH01M4/364H01M4/38H01M4/48H01M4/625H01M4/0471H01M10/0525H01M2004/027Y02E60/10
Inventor 刘晓剑
Owner HUNAN JINYE HIGH TECH CO LTD
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