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Preparation method of hard carbon material for lithium ion battery negative electrode

A lithium-ion battery and negative electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficult uniformity of mass transfer/heat transfer and other reaction elements, affecting product performance, etc., to achieve superior and stable product performance and reduce dust. Harm and loss, the effect of uniform mass transfer and heat transfer

Inactive Publication Date: 2018-10-19
遇秉武
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mainly reflected in: the existing biomass hard carbon and composite hard carbon R&D and preparation schemes, the pyrolysis / composite processes are all solid-phase or semi-solid-phase reactions, which are difficult to be uniform in reaction elements such as mass transfer / heat transfer, which affects product performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1. Add 1.5 kg of pre-oxidized coal tar pitch with a softening point of 180°C to 24 kg of special solvent, stir and dissolve at 80°C.

[0028] Step 2. Mix 6 kg of starch with the asphalt solution in step 1 in a ball mill, stir / grind and raise the temperature to 180°C at 2°C / min under nitrogen protection, and measure the particle size of the ball mill to D 50 is 8 μm.

[0029] Step 3. Cool the suspension in step 2 to 90°C and centrifuge the solid phase slurry, put it into a low-temperature carbonization furnace with stirring, raise the temperature to 450°C at 2°C / hour and keep it for 2 hours and take it out. The liquid-phase pitch solution and the low-temperature carbonization furnace evaporate the solvent before 300°C for recycling.

[0030] Step 4, the solid phase particles taken out in step 3 are crushed / sieved to D 50 7-9μm, put it into a nitrogen atmosphere carbonization furnace, raise the temperature to 1200°C at 5°C / min, and keep it warm for 4 hours to get t...

Embodiment 2

[0033] Step 1. Add 1.5 kg of pre-oxidized coal tar pitch with a softening point of 280°C to 24 kg of special solvent, stir and dissolve at 80°C.

[0034] Step 2. Mix 6 kg of starch with the asphalt solution in step 1 in a ball mill, stir / grind and raise the temperature to 180°C at 2°C / min under the protection of nitrogen to detect the particle size of the ball mill to D 50 is 8 μm.

[0035] Step 3. Cool the suspension in step 2 to 90°C and centrifuge the solid phase slurry, put it into a low-temperature carbonization furnace with stirring, raise the temperature to 450°C at 2°C / hour and keep it for 2 hours and take it out. The liquid-phase pitch solution and the low-temperature carbonization furnace evaporate the solvent before 300°C for recycling.

[0036] Step 4, the solid phase particles taken out in step 3 are crushed / sieved to D 50 7-9μm, put it into a nitrogen atmosphere carbonization furnace, raise the temperature to 1200°C at 5°C / min, and keep it warm for 4 hours to g...

Embodiment 3

[0039] Step 1. Add 1.5 kg of pre-oxidized coal tar pitch with a softening point of 180°C to 24 kg of special solvent, stir and dissolve at 80°C.

[0040] Step 2. Mix 6 kg of starch with the asphalt solution in step 1 in a ball mill, stir / grind and raise the temperature to 180°C at 2°C / min under the protection of nitrogen to detect the particle size of the ball mill to D 50 is 8 μm.

[0041] Step 3. Cool the suspension in step 2 to 90°C and centrifuge the solid phase slurry, put it into a low-temperature carbonization furnace with stirring, raise the temperature to 450°C at 2°C / hour and keep it for 2 hours and take it out. The liquid-phase pitch solution and the low-temperature carbonization furnace evaporate the solvent before 300°C for recycling.

[0042] Step 4, the solid phase particles taken out in step 3 are crushed / sieved to D 50 7-9μm, put it into a nitrogen atmosphere carbonization furnace, raise the temperature to 1150°C at 5°C / min, and keep it warm for 4 hours to g...

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Abstract

The invention relates to a preparation method of a hard carbon material for a lithium ion battery negative electrode. The method comprises the following steps of dissolving purified and pre-oxidized coal asphalt into a special solvent with the temperature being 80 DEG C or more; mixing biomass polyhydroxy alcohols in the asphalt solution; feeding the materials into a ball mill; performing stirring, pyrolysis and compounding; performing wet process ball milling crushing in the ball mill; performing centrifugation on suspension to obtain solid-containing slurry; putting the solid-containing slurry into a low-temperature carbonization furnace for pre-carbonization; performing crushing and sieving on the powder particles; putting the materials into a nitrogen atmosphere carbonization furnace;maintaining the state for a period of time at 1100 to 1200 DEG C to obtain the hard carbon material for the lithium ion battery negative electrode. The main processes are performed in a liquid phase;the environment is sealed; the mass transfer and the heat transfer are uniform; the product performance is excellent and stable; in addition, a liquid phase pumping process can be used by a later-section process; simplicity, convenience and reliability are realized; the dust harm and loss can be reduced; the preparation process is simple; the equipment links are few; the raw material sources are wide; the cost is low; the industrial scaled production is convenient to realize; the great practical appliance significance is realized.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, in particular to a method for preparing a hard carbon material for lithium-ion battery negative poles. Background technique [0002] The negative electrode material of the existing lithium ion battery mainly adopts graphite material. Due to new applications such as power batteries / electric tools / energy storage batteries in recent years, the requirements for improving the rate performance, cycle performance, and low-temperature capacity retention performance of lithium-ion batteries are becoming more and more urgent. There is limited room for improvement of the above performance. The hard carbon anode material, which is also a carbon material, can greatly improve the above-mentioned performance without greatly changing the original battery process. It is currently the most ideal solution. [0003] At present, hard carbon anodes are mainly produced and sold by Japanese compa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/0525
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 遇秉武
Owner 遇秉武
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