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Silicon-based negative electrode self-repairing polymer binder and preparation method and application thereof

A silicon-based anode and polymer technology, applied in electrode manufacturing, battery electrodes, structural parts, etc., can solve the problems of short cycle life of lithium batteries, achieve good electrochemical stability, good mechanical strength, and improve specific capacity and capacity. The effect of retention

Active Publication Date: 2021-06-29
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention provides a method for preparing a silicon-based negative electrode self-repairing polymer binder to overcome the volume expansion of the electrode material described in the prior art and the short cycle life of the lithium battery. The polymer binder can also improve Capacity retention and energy density of silicon-based anodes for batteries

Method used

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  • Silicon-based negative electrode self-repairing polymer binder and preparation method and application thereof
  • Silicon-based negative electrode self-repairing polymer binder and preparation method and application thereof
  • Silicon-based negative electrode self-repairing polymer binder and preparation method and application thereof

Examples

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preparation example Construction

[0036] The preparation method of the negative electrode sheet of embodiment and comparative example is as follows:

[0037] Weigh 0.18g of the mixture of ball-milled silicon-based active material and conductive agent (mass ratio is 7:2), add it to the TA-PEG-TA / PAA solution, stir for 8h at a speed of 1000rmp to mix the slurry, and the obtained slurry is flat Coated on copper foil and dried at 40°C, cut the dried electrode sheet into a negative electrode sheet with a diameter of 14mm, assembled it into a button battery in a glove box, and carried out relevant electrochemical performance tests.

Embodiment 1

[0039] In this embodiment, a silicon-based negative electrode self-healing polymer binder is prepared, and the preparation method is as follows:

[0040] S1. Add polyethylene glycol diacrylate to lipoic acid, the ratio of zinc sulfate to polyethylene glycol terminated by diacrylate groups is 2g:100μL, stir and react at 80°C for 2h, and obtain polyethylene glycol Alcohol-crosslinked polylipoic acid;

[0041] S2. The polyethylene glycol cross-linked polylipoic acid and polyacrylic acid obtained in step S1 were mixed and dissolved in 100 mL of ethanol at a mass ratio of 1:5, and the reaction time was 10 minutes, and dried to obtain the polymer binder.

Embodiment 2

[0043] The difference between this example and Example 5 is that 0.1 wt% ferric chloride is also added in step S1.

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Abstract

The invention discloses a silicon-based negative electrode self-repairing polymer binder and a preparation method and application thereof. The preparation method of the polymer binder comprises the following steps of: S1, adding polyethylene glycol diacrylate into lipoic acid, and carrying out stirring reaction at 50-100 DEG C for 1-5 hours to obtain polyethylene glycol cross-linked polylipoic acid; and S2, mixing the polyethylene glycol cross-linked polylipoic acid obtained in the step S1 with polyacrylic acid according to a mass ratio of 1:(1-20), dissolving the mixture in water or an organic solvent, reacting, and drying the product to obtain the polymer binder. The polymer is high in self-repairing capacity and high in elongation at break, a negative plate prepared from the polymer binder is assembled into a button cell, the specific capacity of a silicon-based negative electrode of a lithium ion battery after stabilization in the cycle process is improved, and the service life of the silicon-based negative electrode of the lithium ion battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, and more specifically, to a silicon-based negative electrode self-repairing polymer binder and its preparation method and application. Background technique [0002] With the development of new energy industries such as the electric vehicle industry, lithium-ion batteries with high energy / power density have become a major research hotspot. In order to meet the requirements of high energy density development, new negative electrode materials—silicon and sulfur have been discovered The theoretical specific capacity of silicon is as high as 4200mAh / g, which is 10 times that of the traditional graphite negative electrode. Moreover, silicon element widely exists in nature. It has a large stock, low price and basically no pollution to the environment. It is a new negative electrode with great application value. Material. However, the dramatic volume expansion of silicon during charging an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/04H01M4/134H01M10/0525
CPCH01M4/622H01M4/0404H01M4/0471H01M4/134H01M10/0525Y02E60/10
Inventor 朱东雨吴柳镇林展蓝明辉蒋开祥陈至鹏王帅黎晓琳
Owner GUANGDONG UNIV OF TECH