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Preparation method for pyrolytic carbon negative electrode material of mixed precursor for low-temperature power battery

A technology of power battery and negative electrode material, which is applied in the field of preparation of mixed precursor pyrolysis carbon negative electrode material for low temperature power battery, can solve the problems of unsuitable battery industrialization, unsuitable low temperature environment, low first coulomb efficiency, etc. The effect of mass production, common equipment, and easy promotion

Active Publication Date: 2019-05-24
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used graphite products have a small interlayer spacing (0.335nm) and are not suitable for low temperature environments
Although pyrolytic carbon products have a large layer spacing, pyrolytic carbon is usually used as activated carbon and has a large specific surface area (>10m 2 / g), it is difficult to control, which results in low initial Coulombic efficiency, and the cost of pyrolytic carbon materials on the market is too high, which are not suitable for the industrialization of full batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing a mixed precursor pyrolytic carbon negative electrode material for a low-temperature power battery, comprising the following steps:

[0025] (1) Dissolve 5g of asphalt into 10g of tetrahydrofuran, and stir it electrically at 200r / min to obtain a resin solution;

[0026] (2) 0.5g glycerin is dissolved in the resin solution that step (1) obtains, electric stirring 200r / min, stir;

[0027] (3) The product obtained in step (2) was removed by thermal distillation at 66° C., and then the sample was transferred to a tube-type atmosphere furnace for pretreatment under the protection of nitrogen with a purity of 99.97%, at a temperature of 120° C. The time is 1h;

[0028] (4) In step (3), nitrogen with a purity of 99.97% is introduced into the tube furnace, heated to 800°C, kept for 2 hours, cooled and ground to a 325-mesh sieve to obtain a mixed precursor pyrolytic carbon for low-temperature power batteries Negative material.

[0029] Mix the obtained ...

Embodiment 2

[0031] A method for preparing a mixed precursor pyrolytic carbon negative electrode material for a low-temperature power battery, comprising the following steps:

[0032] (1) Dissolve 5g of phenolic resin into 100g of ethanol, and stir 200r / min electrically to obtain a resin solution;

[0033] (2) 0.1g of glucose is dissolved in the resin solution obtained in step (1), electric stirring 200r / min, stirring evenly;

[0034] (3) The product obtained in step (2) was removed by thermal distillation at 80°C, and then the dried sample was transferred to a tube-type atmosphere furnace for pretreatment under nitrogen protection at a temperature of 200°C and a time of 10h;

[0035] (4) Pass step (3) into a tube furnace with argon gas with a purity of 99.97%, heat it to 800°C, keep it warm for 2 hours, and grind it through a 325-mesh sieve after cooling to obtain a mixed precursor for low-temperature power battery pyrolysis carbon anode material.

[0036] Mix the obtained mixed precur...

Embodiment 3

[0038] A method for preparing a mixed precursor pyrolytic carbon negative electrode material for a low-temperature power battery, comprising the following steps:

[0039] (1) Dissolve 5g of epoxy resin into 50g of deionized water, and electrically stir at 200r / min to obtain a resin solution;

[0040](2) 5g sucrose is dissolved in the resin solution that step (1) obtains, electric stirring 200r / min, stir evenly;

[0041] (3) The product obtained in step (2) was removed by thermal distillation at 100°C, and then the dried sample was transferred to a tube-type atmosphere furnace for pretreatment under nitrogen protection at a temperature of 300°C and a time of 5h;

[0042] (4) Pass step (3) into a tube furnace with nitrogen gas with a purity of 99.97%, heat it to 2000°C, keep it warm for 2 hours, and grind it through a 325-mesh sieve after cooling to obtain a mixed precursor pyrolytic carbon for low-temperature power batteries Negative material.

[0043] Mix the obtained mixed...

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Abstract

The invention discloses a preparation method for a pyrolytic carbon negative electrode material of a mixed precursor for a low-temperature power battery. The preparation method comprises the followingsteps that resin is dissolved in a solvent to prepare a resin solution, an additive is added, after uniform stirring, a stirring product is obtained, and the stirring product is dried and pretreated;after a pretreatment product is pyrolyzed, a pyrolysis product is cooled, levigated and sieved, and the pyrolytic carbon negative electrode material of the mixed precursor for the low-temperature power battery is prepared. The preparation method is simple in operation, common macromolecule low-cost materials of resin and the like are adopted, the compaction density is increased to 1.5-2.0 g / cm<3>, the macromolecule low-cost material is beneficial for increasing the volume energy density, and the specific surface area of the prepared negative electrode material is controlled to be 1-10 m<2> / g,the first coulombic efficiency exceeds 79%, the interlayer spacing is greater than 0.37 nm, then safety performance is good, and the negative electrode material is suitable for whole battery industrialization; the compaction density is high.

Description

Technical field: [0001] The invention belongs to the technical field of new energy, and in particular relates to a method for preparing a mixed precursor pyrolytic carbon negative electrode material for a low-temperature power battery. Background technique: [0002] As the depletion of non-renewable fossil fuels such as oil and natural gas has attracted increasing attention, air pollution and room temperature effects have become global problems. Solving energy problems and taking the road of low-carbon economy to achieve sustainable development have become the general consensus of all countries in the world. New energy vehicles mainly rely on secondary batteries to store energy. Secondary batteries can be repeatedly charged and discharged, have high efficiency, strong environmental adaptability, and better economical practicability. They have become the main direction of energy storage research. [0003] However, low temperature is the biggest bottleneck encountered by powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/587H01M10/0525
CPCY02E60/10
Inventor 董伟陈跃辉杨绍斌沈丁
Owner LIAONING TECHNICAL UNIVERSITY
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