Method for preparing hard carbon negative electrode materials of lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as unfavorable full utilization of raw materials and production costs, unfavorable control of product batch consistency, and long stabilization heat treatment time. , to reduce the generation of volatile tar by-products, improve batch consistency, and stabilize process optimization.

Active Publication Date: 2012-09-19
DONGFANG ELECTRIC CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. In the process of preparing lithium battery negative electrode materials from starch in this patent, the stabilization heat treatment time in the low temperature section (100-300°C) is longer, which is not conducive to the control of product batch consistency, and also increases energy consumption
[0009] 2. The patent uses starch to prepare the negative electrode material of lithium batteries. In the low-temperature stabilization stage, starch will produce a large amount of tar-like by-products during the low-temperature stabilization heat treatment stage, resulting in a reduction in the residual carbon rate, making the product yield only about 20%, which is not conducive to Full utilization of raw materials and reduction of production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A preparation method of a hard carbon negative electrode material for a lithium ion battery, comprising the following process steps:

[0047] A, select one or several in arbitrary proportions in sulfuric acid, vitriol, boric acid, borate, phosphoric acid, phosphate, hydrochloric acid, hydrochloride, ammonia or ammonium salt as catalyst, be mixed with catalyst solution;

[0048] B, take starch and catalyst solution according to the mass ratio of solute in starch and catalyst solution as 1:1, mix the two, stir;

[0049] C, the solvent is removed, and the obtained solid is dried in a drying oven to obtain the starch powder impregnated with the catalyst;

[0050] The solvent removal mentioned above is the method of using centrifugation, filtration, suction filtration or evaporation.

[0051] D. Add the starch powder impregnated with the catalyst into the heating furnace, raise the temperature to 80°C at a rate of 0.1°C / min under an inert atmosphere, heat for 0.5 hours, and...

Embodiment 2

[0054] A preparation method of a hard carbon negative electrode material for a lithium ion battery, comprising the following process steps:

[0055] A, select one or several in arbitrary proportions in sulfuric acid, vitriol, boric acid, borate, phosphoric acid, phosphate, hydrochloric acid, hydrochloride, ammonia or ammonium salt as catalyst, be mixed with catalyst solution;

[0056] B, according to the mass ratio of solute in the starch and the catalyst solution is 100:1 to take the starch and the catalyst solution, mix the two, stir;

[0057] C, the solvent is removed, and the obtained solid is dried in a drying oven to obtain the starch powder impregnated with the catalyst;

[0058] The solvent removal mentioned above is the method of using centrifugation, filtration, suction filtration or evaporation.

[0059] D. Add the starch powder impregnated with the catalyst into the heating furnace, raise the temperature to 180°C at a rate of 10°C / min under an inert atmosphere, he...

Embodiment 3

[0062] A preparation method of a hard carbon negative electrode material for a lithium ion battery, comprising the following process steps:

[0063] A, select one or several in arbitrary proportions in sulfuric acid, vitriol, boric acid, borate, phosphoric acid, phosphate, hydrochloric acid, hydrochloride, ammonia or ammonium salt as catalyst, be mixed with catalyst solution;

[0064] B, take starch and catalyst solution according to the mass ratio of solute in starch and catalyst solution as 50:1, mix the two, stir;

[0065] C, the solvent is removed, and the obtained solid is dried in a drying oven to obtain the starch powder impregnated with the catalyst;

[0066] The solvent removal mentioned above is the method of using centrifugation, filtration, suction filtration or evaporation.

[0067] D. Add the starch powder impregnated with the catalyst into the heating furnace, raise the temperature to 130°C at a rate of 5°C / min under an inert atmosphere, heat for 2.25 hours, an...

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Abstract

The invention discloses a method for hard carbon negative electrode materials of a lithium ion battery and belongs to the technical field of hard carbon negative electrode materials of the lithium ion battery. By means of the method, one or several kinds with any proportion of sulfuric acid, sulfate, boric acid, borate, phosphoric acid, phosphate, muriatic acid, muriate and ammonia or ammonium salt is/are chosen as a catalyst/catalysts for preparing the hard carbon negative electrode materials of the lithium ion battery in a catalysis method, and compared with the catalysts used in the prior art, the catalysts used in the preparing process of the materials are reduced in low-temperature section stabilized heat treatment temperature, the time is shortened by nearly 10 times, a large number of resources are saved, production cost is reduced, and capacity is improved.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery negative electrode material, more specifically, the invention relates to a catalytic method for preparing a lithium ion battery hard carbon negative electrode material, which belongs to the technical field of lithium ion battery negative electrode materials. Background technique [0002] Lithium-ion secondary batteries have high energy density, high working voltage, long cycle life, no pollution, and good safety performance, making them widely used in portable electronic devices, electric vehicles, large-scale energy storage, space technology, and national defense industries. The application prospect has become a research hotspot during the "Twelfth Five-Year Plan" period. [0003] One of the key technologies of lithium-ion batteries lies in the research on negative electrode materials, so as to improve the performance of batteries. Graphite material has the characteristics of good...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 王瑨谢皎胡蕴成李玉龙
Owner DONGFANG ELECTRIC CORP LTD
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