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Preparation method for battery negative electrode and conductive agent material used for lithium ion battery

A lithium-ion battery and battery negative electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of single pore size distribution, poor conductivity, complex process, etc., achieve low price, improve rate performance, and reduce costs Effect

Inactive Publication Date: 2018-01-23
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The preparation of porous carbon by artificial synthesis is complex, high cost, relatively single pore size distribution, and mostly composed of amorphous carbon with poor conductivity, which cannot meet the needs of lithium-ion battery applications that require good conductivity.

Method used

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  • Preparation method for battery negative electrode and conductive agent material used for lithium ion battery
  • Preparation method for battery negative electrode and conductive agent material used for lithium ion battery
  • Preparation method for battery negative electrode and conductive agent material used for lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) The collected reeds were ultrasonically cleaned 3 times, each time for 30 minutes to remove impurities, and then dried in a blast drying oven at 60°C for 4 hours, and then placed in a vacuum drying oven and dried at 110°C for 10 hours. Finally, the dried material is pulverized into rods with a length less than 3 cm.

[0034] (2) Under an argon atmosphere, heat to 600° C. for carbonization at a heating rate of 3° C. / min, and hold for 4 hours.

[0035] (3) Add hydrochloric acid to the above-mentioned bio-pyrolytic charcoal, stir at 60°C for 6 hours, wash with deionized water after centrifugation until approximately neutral, and dry overnight at 70°C.

[0036] (4) Add sodium hydroxide solution to the material washed with acid solution, stir at 80°C for 8 hours, wash with deionized water after centrifugation until it is about neutral, and dry at 70°C overnight.

[0037] (5) Add zinc chloride solution, stir at 90°C for 10 hours, wash with deionized water after centrifug...

Embodiment 2

[0046] With the step (1) of embodiment 1.

[0047] (1) Under a nitrogen atmosphere, heat to 800°C at a heating rate of 5°C / min for carbonization, and hold for 4 hours.

[0048] (2) Add nitric acid to the above-mentioned bio-pyrolytic charcoal, stir at 60°C for 6 hours, wash with deionized water after centrifugation until it is about neutral, and dry at 70°C overnight.

[0049] (3) Add potassium hydroxide solution to the material cleaned by acid solution, stir at 80°C for 8 hours, wash with deionized water after centrifugation until it is approximately neutral, and dry overnight at 70°C.

[0050](4) Add potassium carbonate solution, stir at 90° C. for 10 h, wash with deionized water after centrifugation until approximately neutral, and dry at 70° C. overnight.

[0051] (5) Preparation of biochar as an electrode sheet for the negative electrode of the battery: the same as Example 1.

[0052] (6) Preparation of electrode sheet when biochar is used as battery conductive agent: S...

Embodiment 3

[0055] (1) The collected taro stems were ultrasonically cleaned 5 times, each time for 30 minutes to remove impurities, and then dried in a blast drying oven at 70°C for 5 hours, and then placed in a vacuum drying oven for 12 hours at 110°C. Finally, the dried material is pulverized into rods with a length less than 3 cm.

[0056] (2) Under an argon atmosphere, heat to 600° C. for carbonization at a heating rate of 5° C. / min, and hold for 6 hours.

[0057] (3) Add sulfuric acid to the bio-pyrolytic charcoal, stir at 60°C for 6 hours, wash with deionized water after centrifugation until approximately neutral, and dry overnight at 70°C.

[0058] (4) Add a mixed solution of potassium hydroxide and potassium carbonate to the acid-washed material, stir at 80°C for 12 hours, wash with deionized water after centrifugation until it is approximately neutral, and dry overnight at 70°C.

[0059] (5) Preparation of biochar as an electrode sheet for the negative electrode of the battery: ...

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Abstract

The invention provides a preparation method for a battery negative electrode and a conductive agent material used for a lithium ion battery. The preparation method comprises the following steps of performing biomass material pretreatment; performing biomass carbonization; performing activation treatment for the first step; performing activation treatment for the second step; performing activationtreatment for the third step; performing preparation of an electrode plate, wherein biomass carbon is used as the battery negative electrode; performing preparation of an electrode plate, wherein biomass carbon is used as the battery conductive agent; and performing battery assembling, wherein the biomass raw materials comprise sweet potato stem, rice husk, lotus leaf stem, watermelon vine, peanutshell and the like. The preparation method has the advantages of complete and reasonable utilization of the biological waste rich in resource, and a high conductive three-dimensional channel of the prepared conductive carbon material; by adopting the conductive carbon as the conductive agent, better conductive characteristic compared with that of the conventional conductive agent is shown; and when the material is used as the negative electrode material, high discharge specific capacity, high rate capability and long cycle life are achieved.

Description

technical field [0001] The invention belongs to the field of lithium ion battery material preparation, and relates to a method for preparing battery negative electrodes and conductive agent materials for lithium ion batteries. Background technique [0002] Lithium-ion batteries have outstanding advantages such as high working voltage, high energy density, high specific capacity, and fast charging and discharging, and are currently widely used in electronic devices such as mobile phones, notebook computers, and portable testers; with the development of large-capacity lithium-ion batteries Successfully developed, lithium-ion batteries have been widely used and concerned in the fields of power battery vehicles and aerospace. However, the high price of lithium-ion batteries has become a bottleneck restricting the development and promotion of power batteries. As an important component of the negative electrode of lithium-ion batteries, the commonly used materials are carbon, Li ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/583
CPCY02E60/10
Inventor 李栋雷超赖华关良杰姚文俐李之锋钟盛文梁彤祥
Owner JIANGXI UNIV OF SCI & TECH
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