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A kind of composite conductive agent slurry for silicon carbon negative electrode and its preparation method and application

A technology of composite conductive agent and conductive agent, applied in the direction of negative electrodes, circuits, electrical components, etc., can solve the problem of non-conductivity of the binder, and achieve the purpose of improving conductivity and cycle performance, improving comprehensive performance, and strengthening heat dissipation. Effect

Active Publication Date: 2018-09-28
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these binders are basically not conductive, and need to be used together with conductive agents

Method used

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  • A kind of composite conductive agent slurry for silicon carbon negative electrode and its preparation method and application
  • A kind of composite conductive agent slurry for silicon carbon negative electrode and its preparation method and application
  • A kind of composite conductive agent slurry for silicon carbon negative electrode and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Select sodium alginate rich in carboxyl functional groups as the binder, first weigh 100mg of sodium alginate, dissolve it in 10ml of deionized water and stir for 2 hours until a uniform binder solution is formed; then add 100mg of water-soluble graphite to the solution olefin powder, continue to stir at 40°C for 2 hours until cross-linked into a uniform mixed slurry, and then ultrasonically disperse for 1 hour to strengthen the cross-linking and dispersion effect; then add 100mg of Super P to the slurry as an auxiliary conductive agent, continue to stir for 4h until a uniform graphene composite conductive agent slurry is formed. figure 1 It is a schematic diagram of the method of using the composite conductive agent slurry for the silicon-carbon negative electrode. figure 2 It is a schematic diagram of the action mechanism of the binder in the prepared silicon-carbon negative electrode composite conductive agent slurry.

[0030] Mix the above-mentioned composite cond...

Embodiment 2

[0039] The combination of sodium alginate with rich carboxyl functional groups and polyacrylic acid was selected as the composite binder. First weigh 50mg of sodium alginate, dissolve it in 5ml of deionized water, and stir for 2 hours until a uniform solution is formed; then add polyacrylic acid solution with a solid content of 50mg to it, add water to 8ml, and continue stirring for 2 hours until uniform; Add 50 mg of water-soluble graphene powder to the solution, continue to stir at 40°C for 2 hours until cross-linked into a uniform mixed slurry, and then ultrasonically disperse for 1 hour to strengthen the cross-linking and dispersion effect; Add 50mg of Super P as an auxiliary conductive agent, and continue stirring for 4h until a uniform composite conductive agent slurry is formed.

[0040] The above-mentioned composite conductive agent slurry is mixed with a commercial silicon-carbon negative electrode material (94% carbon content) according to the ratio of solid content ...

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Abstract

The invention discloses a composite conductive agent slurry for a silicon-carbon anode and a preparation method and application thereof. The composite conductive agent slurry mainly contains a graphene-based conductive agent and a high-viscosity polymer binder provided with a specific carboxyl functional group. The graphene-based conductive agent and the binder have a synergistic effect, a stable conductive elastic inhabitation layer can be formed on the surface of the silicon-carbon anode, the volume expansion of the silicon-carbon anode material in the charging and discharging process is inhibited while the internal resistance of a battery is effectively reduced, stable cycle is achieved, heat dissipation is strengthened, and accordingly the overall performance of the battery is improved. The preparation method of the composite conductive agent slurry is simple in process, easy to regulate and control and capable of achieving large-scale low-cost preparation, and the obtained slurry is high in stability, can be directly mixed with a commercialized silicon-carbon anode material in proportion for usage and can be applied to multiple volume expansion type electrode materials.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a composite conductive agent slurry for a silicon-carbon negative electrode and a preparation method and application thereof. Background technique [0002] In commercial lithium-ion battery systems, graphitic carbon is generally used as the anode material. The theoretical capacity of graphite is only 372mAh / g, which cannot meet the increasing capacity demand of lithium-ion batteries. Silicon-carbon composite material is a composite material made by adding silicon (specific capacity 4200mAh / g) with high specific capacity, abundant reserves in nature and low price to carbon material with certain mechanical strength and electrical conductivity. The high capacity of silicon and the conductivity of carbon materials are considered to be one of the "10 potential materials that will affect the development of the lithium battery industry in the future". However, in practic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/133H01M4/134H01M4/1393H01M4/1395H01M10/0525
CPCH01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/622H01M4/625H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 李峰石颖张欣闻雷刘峰成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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