Silicon carbon negative electrode slurry and preparation method thereof

A technology of negative electrode slurry and silicon carbon, which is applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems that the electrochemical performance of active materials cannot be exerted, unfavorable cost control, and loss of electrical connection, etc., to achieve improved The degree of network crosslinking, swelling suppression, and the effect of suppressing negative electrode swelling

Active Publication Date: 2019-03-29
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, during the cycle of the battery, the silicon-carbon negative electrodes of the same layer will expand; the silicon-carbon negative electrodes will gradually generate cracks during the expansion and contraction process, and when the cracks increase to a certain extent, the active materials will become isolated islands shape, loss of electrical connection, and the electrochemical performance of the active material will gradually fail to play, etc.
In addition, most of the existing preparation processes require multiple coatings, and the process is cumbersome, which is not conducive to cost control

Method used

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  • Silicon carbon negative electrode slurry and preparation method thereof

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Effect test

Embodiment 1

[0068] This embodiment provides a silicon-carbon negative electrode slurry, which contains the following components in terms of mass percentage: 94.9% silicon-based / graphite mixture, 2% binder, single-walled carbon nano Tube 1%, carbon black 0.1%, coupling agent 2%;

[0069] Wherein, the binder is a polyacrylic acid-based polymer containing carboxyl functional groups, and the monomer of the polymer contains more than 3 hydroxyl groups, and the molecular weight is greater than 10000; the carbon black is conductive carbon black (Super-p), The particle size is 0.1-2 μm; the diameter of the single-walled carbon nanotube is 0.6-10 nm, and the tube length is 5-30 μm; the silicon base in the silicon-based / graphite mixture is silicon oxide-coated carbon; the graphite is artificial Graphite; the coupling agent is a silane coupling agent.

[0070] Prepare the above silicon carbon negative electrode slurry according to the following method:

[0071](1) Carry out dry mixing with silicon...

Embodiment 2

[0078] This embodiment provides a silicon-carbon negative electrode slurry, which contains the following components in terms of mass percentage: 93.7% silicon-based / graphite mixture, 6% binder, single-walled carbon nano Tube 0.1%, carbon black 0.1%, coupling agent 0.1%;

[0079] Wherein, the binder is a polyacrylic acid-based polymer containing carboxyl functional groups, and the monomer of the polymer contains more than 3 hydroxyl groups, and the molecular weight is greater than 10000; the carbon black is conductive carbon black (Super-p), The particle size is 0.1-2 μm; the diameter of the single-walled carbon nanotube is 0.6-10 nm, and the tube length is 5-30 μm; the silicon base in the silicon base / graphite mixture is silicon alloy coated carbon; the graphite is a natural coating Graphite-coated; the coupling agent is a titanate coupling agent.

[0080] Prepare the above silicon carbon negative electrode slurry according to the following method:

[0081] (1) Carry out dry...

Embodiment 3

[0088] This embodiment provides a silicon-carbon negative electrode slurry, which contains the following components in terms of mass percentage: 96% silicon-based / graphite mixture, 2% binder, single-walled carbon nano Tube 0.1%, carbon black 0.1%, coupling agent 0.8%;

[0089] Wherein, the binder is a polyacrylic acid-based polymer containing carboxyl functional groups, and the monomer of the polymer contains more than 3 hydroxyl groups, and the molecular weight is greater than 10000; the carbon black is conductive carbon black (Super-p), The particle size is 0.1-2 μm; the diameter of the single-walled carbon nanotube is 0.6-10 nm, and the tube length is 5-30 μm; the silicon base in the silicon-based / graphite mixture is nano-silicon-coated carbon; the graphite is a natural coating Graphite-coated; the coupling agent is a titanate coupling agent.

[0090] Prepare the above silicon carbon negative electrode slurry according to the following method:

[0091] (1) Carry out dry m...

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Abstract

The invention relates to a silicon carbon negative electrode slurry and a preparation method thereof. The silicon carbon negative electrode slurry comprises a silicon-based/graphite mixture, a binder,a single-walled carbon nanotube, carbon black and a coupling agent. The binder is polyacrylic-acid-based polymer containing a carboxyl functional group. According to the invention, the silicon carbonnegative electrode is modified by using the polyacrylic-acid-based polymer containing a carboxyl functional group and the coupling agent under coordination, so that the expansion and contraction rateof the silicon carbon negative electrode is reduced, the conductivity of the silicon carbon negative electrode and the negative current collector copper foil as well as the utilization rate of the negative active materials are improved, and the cycle life of the battery is prolonged. Meanwhile, the single-walled carbon nanotube serves as an electric bridge, thereby eliminating the phenomenon of active material failure during the cycle process of the battery. According to the invention, a silicon carbon negative electrode slurry is prepared by combining a stepped binder adding method with a dry-wet method, so that the electrical property of the material is further improved. Moreover, the preparation process is simple and the silicon carbon negative electrode slurry and the preparation method thereof have the broad application prospects.

Description

technical field [0001] The invention belongs to the field of high-capacity lithium-ion batteries, and in particular relates to a silicon-carbon negative electrode slurry and a preparation method thereof. Background technique [0002] With the progress of society, electronic products and electric vehicles have higher and higher requirements for battery energy density. At present, the gram capacity of the graphite negative electrode in the full battery has reached 355mAh / g, reaching more than 95% of the theoretical value, and its application is close to the limit. Due to its abundant reserves and ultra-high theoretical specific capacity, silicon-based anode materials are gradually becoming the best choice for battery companies and lithium battery materials to improve anodes, and are one of the most promising anode materials for next-generation lithium-ion batteries. [0003] However, silicon-carbon anode materials also have obvious shortcomings in the actual use process, main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/62H01M4/622H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 张章明龚金保黄明
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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