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A boron doping modified soft carbon coating negative electrode material with high stability under high and low temperature environment and a preparation method thereof

A high-stability, negative-electrode material technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of high modification cost, high-pollution and high-risk type gases, difficult to apply on a large scale, and reduce surface Defects, simple preparation process, economical effect of raw materials

Active Publication Date: 2019-01-08
HUZHOU CHUANGYA POWER BATTERY MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on the doping and modification of negative electrode materials mainly focuses on elements such as N, P, and S, and the doping is mainly carried out through thermal recombination reactions. However, the doping process of these elements is difficult to operate in actual production, and the cost of modification is relatively high. Moreover, the compounds of these elements are usually volatile, and are easily accompanied by the generation of high-pollution and high-risk gases during the production process
For example, N element doping, in the literature research, melamine is mostly used as the N element dopant, but in the process of melamine decomposition, hydrogen cyanide gas will be generated, which is very dangerous and polluting, and it is difficult to apply on a large scale

Method used

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  • A boron doping modified soft carbon coating negative electrode material with high stability under high and low temperature environment and a preparation method thereof
  • A boron doping modified soft carbon coating negative electrode material with high stability under high and low temperature environment and a preparation method thereof
  • A boron doping modified soft carbon coating negative electrode material with high stability under high and low temperature environment and a preparation method thereof

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Experimental program
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preparation example Construction

[0041] The preparation method of above-mentioned negative electrode material, comprises the following steps:

[0042] 1) Take the powder of the negative electrode base material, add soft carbon carbon source and boron compound to the powder, then add it to the high-speed mixer, stir evenly, and obtain the mixed powder;

[0043] 2) Transfer the mixed powder into the low-temperature thermal composite reaction equipment, and heat it to 400-700°C under a protective atmosphere, preferably at a temperature of 500-650°C, keep it warm, and take it out after natural cooling;

[0044] 3) transfer the cooled mixed powder into a carbonization equipment, and heat it to 800-1350°C under a protective atmosphere, wherein the preferred temperature is 950-1150°C, keep it warm, take it out after natural cooling, and obtain the negative electrode material;

[0045] 4) Sieving to obtain a finished negative electrode material.

[0046] As preferably, in step 1), the stirring time is 1-12h, wherein...

Embodiment 1

[0050] Example 1: 0.5% boric acid doping modification, 2% high softening point pitch carbon source coated boron doped modified soft carbon coated high and low temperature negative electrode material

[0051] Get 4g of high softening point pitch (5 microns in median particle size) and 1g boric acid (3 microns in median particle size) and add 200g of graphite negative electrode material (6.60 μm in median particle size), then add to the high-speed mixer, Stir rapidly for 1 hour. After mixing evenly, transfer to a small vertical kettle. Under a nitrogen atmosphere, heat up to 550°C and heat for 6 hours. After cooling, transfer the compounded materials into a tubular carbonization furnace. Under a nitrogen atmosphere, heat up to 1000°C, heat for 10 hours, cool naturally and sieve with a 325-mesh sieve. A high and low temperature negative electrode material coated with 0.5% non-metallic boron doped and modified with 2% soft carbon is obtained. The prepared product was uniformly mi...

Embodiment 2

[0053] Example 2: 2% boric acid doping modification, 6% high softening point pitch carbon source coating boron doping modified soft carbon coating high and low temperature negative electrode material.

[0054] Get 12g of high softening point pitch (5 microns in median particle diameter) and 4g boric acid (8 microns in median particle diameter) and add 200g graphite negative electrode material (6.60 μm in median particle diameter), then join in the high-speed mixer, Stir rapidly for 1 hour. After mixing evenly, transfer to a small vertical kettle. Under a nitrogen atmosphere, heat up to 550°C and heat for 6 hours. After cooling, transfer the compounded materials into a tubular carbonization furnace. Under a nitrogen atmosphere, the temperature was raised to 1000° C., heated for 10 hours, and cooled naturally to obtain a negative electrode material. Pass the fluorine gas through the cooling medium containing calcium chloride and ice and the filter layer of sodium fluoride at 100...

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Abstract

The invention relates to the field of lithium batteries, and discloses a boron doped modified soft carbon coating negative electrode material with high stability under a high-low temperature environment and a preparation method thereof. An amorphous carbon-carbon lay is formed on that surface of a negative electrode substrate aft carbonization by a soft carbon source, boron oxide is generated by decomposing a boron compound at a high temperature, the reaction of the boron oxide with the amorphous carbon and the surface of the negative electrode substrate is controlled, and a composite structure such as a boron-carbon bond and a boron-carbon-oxygen bond is for on the surface of the negative electrode material at a high temperature. 1, that soft carbon coat can reduce the impedance of the material under the low temperature, improve the liquid absorption performance, increase the low-temperature discharge voltage platform and greatly improve the low-temperature performance of the material; 2. By the catalysis of boron, the degree of graphitization of the cathode material is increased by reducing the surface defects, so that the specific surface area is greatly reduced, and the side reaction of the cathode material with the electrolyte at high temperature is reduced by the smaller specific surface area, and the performance at high temperature is obviously improved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a boron-doped modified soft carbon-coated negative electrode material with high stability in high and low temperature environments and a preparation method thereof. Background technique [0002] In recent years, with the increasing demand for 3C digital and power battery energy storage devices, the energy field, especially lithium-ion batteries and supercapacitors, has attracted widespread attention. At present, the anode material of lithium-ion batteries widely used in industry is graphite carbon material, but its operating temperature is usually around 25°C at room temperature. There have been reports of mobile phones automatically shutting down when the temperature is too low. However, when the operating temperature is high, especially when used in high-temperature areas such as the equator, the negative electrode material is prone to side reactions with the electrolyte durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/583H01M4/62H01M10/0525Y02E60/10
Inventor 刘朗王祥廉蔡新辉袁旭刘锐剑吕猛胡博
Owner HUZHOU CHUANGYA POWER BATTERY MATERIALS
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