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Preparation method of silicon-carbon-silver composite negative electrode of lithium ion battery

A lithium-ion battery, silicon carbon technology, applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc. Difficulty in production, low utilization of silver, etc., to achieve the effects of easy preparation and large-scale production, improving utilization, and increasing conductivity

Pending Publication Date: 2021-02-05
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The problem to be solved by the present invention is to provide a method for preparing a silicon-carbon-silver composite negative electrode for a lithium-ion battery, which can effectively solve the problem of not improving the electrical conductivity of silicon-carbon materials, the first Coulombic efficiency and cycle performance, and the low utilization rate of silver. High cost, high cost, complex process, difficulty in mass production, etc.

Method used

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  • Preparation method of silicon-carbon-silver composite negative electrode of lithium ion battery
  • Preparation method of silicon-carbon-silver composite negative electrode of lithium ion battery
  • Preparation method of silicon-carbon-silver composite negative electrode of lithium ion battery

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Embodiment 1

[0024] A method for preparing a silicon-carbon-silver composite negative electrode comprises assembling a silicon-carbon-silver composite negative electrode, a lithium-ion battery electrolyte, and a metal lithium negative electrode into a button-type lithium-ion battery. Concrete preparation process is as follows:

[0025] S1: Mix 0.9g of silicon carbon raw material with 0.05g of conductive agent (SP), add 2ml of PVDF binder, then add 4ml of NMP organic solvent, stir at room temperature for 2 hours and mix evenly to form a uniform colloid; The method prepares the silicon carbon electrode sheet with a thickness of about 80-200um;

[0026] S2: Cut the silicon carbon electrode sheet into 10cm×10cm electrode sheet, place it in a vacuum oven, set the oven temperature to 110°C, and set the drying time to 12 hours;

[0027] S3: Place the electrode sheet on the sample holder of the electron beam evaporation equipment, adjust the substrate distance to 8cm, and then evacuate to 8╳10 -...

Embodiment 2

[0031] A method for preparing a silicon-carbon-silver composite negative electrode comprises assembling a silicon-carbon-silver composite negative electrode, a lithium-ion battery electrolyte, and a metal lithium negative electrode into a button-type lithium-ion battery. Concrete preparation process is as follows:

[0032] S1: Mix 0.9g silicon carbon raw material with 0.05g conductive agent (SP), add 2ml PVDF binder, then add 4ml NMP organic solvent, stir at room temperature for 2 hours and mix evenly to form a uniform colloid; Method to prepare silicon carbon electrode sheets with a thickness of about 150um;

[0033] S2: Cut the silicon-carbon-silver composite electrode sheet into 10cm×10cm electrode sheet, place it in a vacuum oven, set the oven temperature to 120°C, and set the drying time to 15h;

[0034] S3: Place the electrode sheet on the sample holder of the electron beam evaporation equipment, adjust the substrate distance to 10cm, and then evacuate to 8╳10 -4 Pa; ...

Embodiment 3

[0038] A method for preparing a silicon-carbon-silver composite negative electrode comprises assembling a silicon-carbon-silver composite negative electrode, a lithium-ion battery electrolyte, and a metal lithium negative electrode into a button-type lithium-ion battery. Concrete preparation process is as follows:

[0039]S1: Mix 0.8g of silicon carbon raw material with 0.1g of conductive agent (SP), add 3ml of PVDF binder, then add 4ml of NMP organic solvent, stir at room temperature for 2 hours and mix evenly to form a uniform colloid. Method to prepare a silicon carbon electrode sheet with a thickness of about 100um;

[0040] S2: Cut the silicon carbon silver electrode sheet into 10cm×10cm electrode sheet, place it in a vacuum oven, set the oven temperature to 100°C, and set the drying time to 24h;

[0041] S3: Place the electrode sheet on the sample holder of the electron beam evaporation equipment, adjust the substrate distance to 10cm, and then evacuate to 8╳10 -4 Pa; ...

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Abstract

The invention provides a preparation method of a silicon-carbon-silver composite negative electrode of a lithium ion battery. The method comprises the following steps: S1, mixing a silicon-carbon material, a conductive agent and a binder in proportion, and adding an organic solvent to form body colloid so as to prepare a silicon-carbon electrode plate; S2, drying the silicon-carbon electrode plateunder a vacuum condition; S3, placing the carbon-silicon electrode plate in electron beam evaporation equipment, and vacuumizing to be lower than 8 * 10 <-4>Pa; and S4, performing metal evaporation on a silver raw material in the electron beam evaporation equipment, and covering the silicon-carbon electrode plate with the silver raw material to obtain the silicon-carbon-silver composite negativeelectrode. The method has the beneficial effects that the problems that the conductivity, the initial coulombic efficiency and the cycle performance of the silicon-carbon material cannot be well improved, the utilization rate of silver is not high, the cost is high, the process is complex, and batch production is difficult are effectively solved.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a method for preparing a silicon-carbon-silver composite negative electrode of a lithium-ion battery. Background technique [0002] Compared with traditional secondary batteries, lithium-ion batteries have the advantages of high open circuit voltage, high energy density, long cycle life, no memory effect and small self-discharge. With the increasingly prominent environmental problems and the continuous advancement of the Internet of Things, a large number of portable consumer electronic devices (notebook computers, mobile communications, digital cameras, Bluetooth headsets, etc.), wearable devices and electric vehicles have been put forward. In this context, lithium-ion batteries with fast charging and discharging, high energy density and long cycle life have broad application prospects. [0003] At present, the mainstream anode materials for lithium-i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525H01M10/42
CPCH01M4/362H01M4/583H01M4/625H01M4/386H01M10/0525H01M10/4235Y02E60/10
Inventor 纪伟伟陈欣蕊蔡超高鹏刘兴江
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST