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Modified preparation method of hard carbon negative electrode material with high initial efficiency and long cycle life

A technology of cycle life and negative electrode materials, applied in the field of modification and preparation of hard carbon negative electrode materials, can solve the problems of limiting large-rate charge and discharge, low electronic conductivity, low ion conductivity, etc., to improve cycle stability and increase g Capacity, the effect of improving electronic conductivity

Inactive Publication Date: 2021-08-10
江苏中兴派能电池有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the hard carbon roasted at low temperature has a high ionic conductivity, it has the disadvantages of low first effect, low electronic conductivity, and unstable cycle; although the hard carbon roasted at high temperature has high first effect, high electronic conductivity, and relative structure The advantages of stability, but its low ionic conductivity and low gram capacity limit the application of its high rate charge and discharge

Method used

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  • Modified preparation method of hard carbon negative electrode material with high initial efficiency and long cycle life
  • Modified preparation method of hard carbon negative electrode material with high initial efficiency and long cycle life

Examples

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Effect test

Embodiment 1

[0036] Embodiment 1 (comparative example)

[0037] A modification preparation method of a hard carbon carbon negative electrode material for a sodium ion battery, specifically comprising the following steps:

[0038] A: Weigh 10kg of NMP (1-methyl-2-pyrrolidone), 10kg of medium-temperature coal tar pitch and add it to a double planetary mixer, revolution 40r / min, rotation 2500r / min, and stir for 5h;

[0039] B: Weigh 60kg of absolute ethanol and add it to a conical heating mixer with a rotating speed of 160r / min, and simultaneously add 40kg of biomass hard carbon roasted at 1000°C, and stir for 2h;

[0040] C: Weighing 2.4kg of carbon tube slurry with a solid content of 5% will be added to the conical heating mixer of step B in the future, with a rotating speed of 160r / min and stirring for 1.5h;

[0041] D: Add 8 kg of asphalt solution of step A to the mixture of step C, rotate at 160 r / min, stir for 3 h;

[0042] E: Heat and evaporate the mixture in step D to dryness, the h...

Embodiment 2

[0049] A modification preparation method of a hard carbon carbon negative electrode material for a sodium ion battery, specifically comprising the following steps:

[0050] A: Weigh 10kg of NMP (1-methyl-2-pyrrolidone), 10kg of medium-temperature coal tar pitch and add it to a double planetary mixer, revolution 40r / min, rotation 2500r / min, and stir for 5h;

[0051] B: Weigh 30kg of absolute ethanol and add it to a conical heating mixer at a speed of 160r / min, and simultaneously add 40kg of biomass hard carbon roasted at 1000°C, and stir for 2h;

[0052] C: Take 2.4kg of carbon tubes with a solid content of 5% and add them to the conical heating mixer of step B in the future, with a rotating speed of 160r / min and stirring for 1.5h;

[0053] D: Add 8 kg of asphalt solution of step A to the mixture of step C, rotate at 160 r / min, stir for 3 h;

[0054] E: Heat and evaporate the mixture in step D to dryness, the heating temperature is 90°C, the rotation speed is 160r / min, and the...

Embodiment 3

[0058] Embodiment 3 (rotating speed is adjusted to 200r / min by 160r / min in the step B)

[0059] A modification preparation method of a hard carbon carbon negative electrode material for a sodium ion battery, specifically comprising the following steps:

[0060] A: Weigh 10kg of NMP (1-methyl-2-pyrrolidone), 10kg of medium-temperature coal tar pitch and add it to a double planetary mixer, revolution 40r / min, rotation 2500r / min, and stir for 5h;

[0061] B: Weigh 60kg of dehydrated ethanol and join in the conical heating mixer with a rotating speed of 200r / min, and simultaneously add 40kg of biomass hard carbon roasted at 1000°C, and stir for 2h;

[0062] C: Take 2.4kg of carbon tubes with a solid content of 5% and add them to the conical heating mixer of step B in the future, at a speed of 200r / min, and stir for 1.5h;

[0063] D: Add 8 kg of asphalt solution of step A to the mixture of step C, stir at 200 r / min for 3 h at a rotating speed;

[0064] E: Heat and evaporate the m...

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Abstract

The invention provides a modification preparation method of a hard carbon negative electrode material with high first efficiency and long cycle life. The modification preparation method comprises the following steps: S1, premixing 10 parts of NMP and 10 parts of medium-temperature coal tar pitch; S2, placing 40 parts of biomass hard carbon in 30-60 parts of an organic solution, performing stirring to prepare a suspension, adding 2.4-4.8 parts of the carbon tube slurry into the suspension, and performing uniform stirring; S3, adding the premixed asphalt solution in the step S1 into the mixture obtained in the step S2, and performing uniform stirring; S4, heating and evaporating the mixture obtained in S3 to dryness, performing roasting and cooling in a CAD furnace under the protection of inert gas, and performing screening to obtain the modified hard carbon negative electrode material for the sodium-ion battery. The prepared modified hard carbon negative electrode material has the advantages of being high in first efficiency and long in cycle life, and in addition, the preparation process is convenient to operate, low in cost and suitable for industrial production.

Description

technical field [0001] The invention relates to the field of sodium ion batteries, in particular to a method for modifying and preparing a hard carbon negative electrode material with high initial efficiency and excellent cycle life. Background technique [0002] Sodium-ion battery is a new type of energy storage power supply, which has the advantages of abundant raw material reserves, wide distribution, low cost, no development bottleneck, environmental friendliness, and compatibility with existing production equipment of lithium-ion batteries. It also has good power characteristics, wide temperature Advantages such as range applicability, safety performance and no over-discharge problem. At the same time, by virtue of the fact that both positive and negative electrodes can use aluminum foil current collectors to construct bipolar batteries, the energy density of sodium-ion batteries can be further improved, making sodium-ion batteries move towards the direction of low cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/587H01M4/62H01M10/054
CPCC01B32/05H01M4/587H01M4/628H01M4/625H01M10/054H01M2004/027Y02E60/10
Inventor 袁树兵胡学平周勇刘学青吴正能杨庆亨
Owner 江苏中兴派能电池有限公司
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