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Silicon-carbon composite material water-based composite slurry and preparation method thereof, and lithium ion battery

A technology of silicon-carbon composite materials and composite slurry, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor strength of SBR emulsion and the inability to apply Si-based system materials, etc., to suppress volume expansion effect and improve distribution Uniformity, the effect of improving stability

Active Publication Date: 2019-08-30
SHANGHAI ELECTRICGROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem actually solved by the present invention is to overcome the defects in the prior art that the SBR emulsion itself has poor strength and cannot be applied to Si-based system materials with high volume expansion, and provides a water-based composite slurry for silicon-carbon composite materials and its preparation method, lithium-ion battery

Method used

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  • Silicon-carbon composite material water-based composite slurry and preparation method thereof, and lithium ion battery
  • Silicon-carbon composite material water-based composite slurry and preparation method thereof, and lithium ion battery
  • Silicon-carbon composite material water-based composite slurry and preparation method thereof, and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Preparation of water-based composite slurry for silicon-carbon composite materials:

[0048] 1) Take 1.7g of powdered silicon-carbon composite material (650mAh / g) and 0.1g of conductive carbon black and use a planetary rotor mixer to stir the dry powder for 30 minutes; wherein, the revolution speed is 2000r / min;

[0049] 2) Add 1.3 g of deionized water and 1.6 g of sodium carboxymethylcellulose colloid (5% content) to the dry powder mixed in step (1), soak and stir in a planetary rotor mixer for 20 minutes to obtain a uniform primary Slurry, control the total solid content ratio at about 45%; among them, the revolution speed of immersion stirring is 1500r / min;

[0050] 3) Continue to add a mixed emulsion of 0.12 g of styrene-butadiene rubber emulsion (50% content) and 0.2 g (30% content) of polyacrylic acid emulsion to the slurry after soaking and stirring, stir at a medium speed for a short time and defoam 2min (the revolution speed of defoaming is 1000-1200r / min), le...

Embodiment 2

[0054] Preparation of water-based composite slurry for silicon-carbon composite materials:

[0055] 1) Take 3.72g of powdered silicon-carbon composite material (with a capacity of 450mAh / g) and 0.08g of conductive carbon black and use a planetary rotor mixer to stir the dry powder for 25 minutes; wherein, the revolution speed is 2200r / min;

[0056] 2) Add 1.6 g of deionized water and sodium carboxymethylcellulose colloid (5% content) to the dry powder mixed in step (1), soak and stir in a planetary rotor mixer for 30 minutes to obtain a uniform primary slurry , control the total solid content ratio at about 45%; wherein, the revolution speed of immersion stirring is 1000r / min;

[0057] 3) Continue to add a mixed emulsion of 0.12 g (content: 60%) of styrene-butadiene rubber emulsion and 0.2 g (content: 30%) of polyacrylic acid emulsion to the slurry after soaking and stirring, carry out medium-speed short-term stirring and defoaming 1min (the revolution speed of defoaming is 1...

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Abstract

The invention discloses silicon-carbon composite material water-based composite slurry a preparation method thereof, and a lithium ion battery. The preparation method comprises the steps of: (1) performing dry power stirring of a silicon-carbon composite material and SP to obtain a material A; (2) performing infiltrating and stirring of the material A, water and CMC colloid to obtain slurry, wherein the solid content of the slurry is 40-45%; (3) performing stirring of the slurry, an SBR emulsion and a PAA emulsion at an intermediate speed, and performing defoaming and standing; and (4) regulating the viscosity to be 2000-3000 mPa.s. The water-based composite binder slurry takes water as a solvent, is uniformly dispersed, shortens the time of secondary stirring in the preparation process, can effectively improve the distribution uniformity of the binder on the pole piece, effectively inhibits the decomposition of electrolyte in the circulation process, and forms a more uniform SEI film,so that the prepared lithium ion battery has high first coulombic efficiency and a good circulation performance.

Description

technical field [0001] The invention relates to a silicon-carbon composite water-based composite slurry, a preparation method thereof, and a lithium ion battery. Background technique [0002] In recent years, with the decreasing of fossil energy and the increasingly severe environmental problems, the application of lithium-ion batteries in the fields of electric vehicles and energy storage has attracted more and more attention. Lithium-ion batteries are considered to be the most promising electrical energy storage devices due to their higher energy density and power density compared to other types of batteries. However, the energy density and power density of existing lithium-ion batteries are still low, and their safety and cycle life have not yet met the requirements for future applications in electric vehicles and energy storage systems. [0003] Graphite anode materials have been widely used in the production of lithium-ion batteries due to their high cycle efficiency a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/364H01M4/38H01M4/386H01M4/625H01M10/0525Y02E60/10
Inventor 陈献武李旺詹吟桥闫海
Owner SHANGHAI ELECTRICGROUP CORP
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