Silicon-carbon negative electrode material adhesive as well as preparation method and application thereof

A negative electrode material and binder technology, applied in the field of silicon carbon negative electrode material binder and its preparation, to achieve the effect of improving processability, improving cycle stability, and reducing gas production problems

Active Publication Date: 2022-01-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned shortcoming of prior art, provide a kind of binder of silicon-carbon negative electrode material and its preparation method and application, to solve the problem of binder suitable for silicon-carbon negative electrode material in the prior art

Method used

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  • Silicon-carbon negative electrode material adhesive as well as preparation method and application thereof
  • Silicon-carbon negative electrode material adhesive as well as preparation method and application thereof
  • Silicon-carbon negative electrode material adhesive as well as preparation method and application thereof

Examples

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preparation example Construction

[0035] The preparation method of the above-mentioned device is a traditional radical polymerization method, comprising the following steps:

[0036] Step 1, preparation of polyvinyl acetate-co-polyacrylic acid (PVAc-co-PAA) precursor solution: add polyvinyl alcohol and emulsifier to water in turn, heat to dissolve them all, polyvinyl alcohol molecular weight is less than 100000, preferred polyvinyl alcohol The molecular weight of vinyl alcohol is 31000, the emulsifier is OP-10, the heating temperature is 80-90°C, the heating time is 20-40min, and the solution A is obtained after cooling for later use; since vinyl acetate has high solubility in water and is easy to hydrolyze, The generated acetic acid will interfere with the polymerization; at the same time, the vinyl acetate free radical is very active and the chain transfer reaction is significant, so polyvinyl alcohol will be added for protection. The purpose of adding emulsifier is to make vinyl acetate better dispersed und...

Embodiment 1

[0048] (1) Dissolve 0.2g of polyvinyl alcohol and 0.2g of OP-10 in water, heat at 85°C for 30min to dissolve the above substances, and cool down for later use to obtain solution A.

[0049] (2) Dissolve 2.8g of acrylic acid, 0.4g of lithium hydroxide monohydrate, and 1.2g of vinyl acetate in solution A in sequence to form reaction system B, remove oxygen from reaction system B by bubbling for 30 minutes, and finally add 0.04g of ammonium persulfate was used as an initiator, and the monomer concentration was 20%wt. After reacting at 75° C. for 30 minutes, a copolymer solution C was obtained and kept for future use.

[0050] (3) Synthesis of polyvinyl acetate-co-lithium polyacrylate-co-polyacrylic acid (PVAc-co-PAALi-co-PAA), add 0.8g lithium hydroxide monohydrate to copolymer C, and add water to make the concentration From 20%wt to 10%wt, the reaction temperature is 60°C, and the reaction time is 60min. After the reaction, polyvinyl acetate-polyacrylate lithium-polyacrylic acid...

Embodiment 2

[0053] The preparation method and reaction conditions of polyvinyl acetate-co-lithium polyacrylate-co-polyacrylic acid copolymer are the same as in Example 1, and the feed ratio is polyvinyl alcohol, emulsifier, acrylic acid, total lithium hydroxide monohydrate, vinyl acetate The mixing ratio of the ester and the initiator is 5:5:50:37.5:50:1, and the mass ratio of the three blocks is vinyl acetate: lithium acrylate: acrylic acid = 50:37.5:12.5 to complete the adhesive A2 preparation.

[0054] The binder A2 was used to prepare silicon carbon negative electrodes for lithium-ion batteries according to the above method and assembled into lithium-ion batteries to test their performance.

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Abstract

The invention discloses a silicon-carbon negative electrode material adhesive and a preparation method and application thereof. The adhesive is an amphiphilic copolymer, polyvinyl acetate and polyacrylic acid are copolymerized in the adhesive, the proportion of the polyvinyl acetate and the polyacrylic acid is regulated, organic unification of a hydrophobic polymer and a hydrophilic polymer is achieved, and the prepared amphiphilic copolymer adhesive can be uniformly dispersed and dissolved in water, so that the adhesive effect of polyvinyl acetate on carbon and the adhesive effect of polyacrylic acid on silicon are respectively exerted; and the adhesive has the characteristic of multiple functions, polyvinyl acetate adheres to carbon through hydrophobic interaction, polyacrylic acid adheres to silicon through hydrogen-bond interaction, and meanwhile, lithium hydroxide monohydrate is introduced to adjust the pH of a polymer, so that the problem of gas production of carboxyl groups is solved.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a silicon-carbon negative electrode material binder and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have been widely used in electric vehicles, 3C products, and energy storage devices for renewable energy and smart grids. At present, the cathode materials of commercial lithium-ion batteries are oxide cathode materials such as LiCoO 2 , LiMn 2 o 4 and LiFePO 4 Mainly; the negative electrode material is graphite and various carbon materials with graphite as the precursor. Although carbon materials have good reversible charge-discharge performance, their theoretical capacity is low (372mAh / g), and their high-rate charge-discharge performance is poor. And when the battery is overcharged, lithium dendrites are easily formed on the surface of the carbon material, causing a short circuit and causing a safet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/38H01M4/583H01M10/0525
CPCH01M4/622H01M4/625H01M4/362H01M4/386H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 宋江选匡国庆
Owner XI AN JIAOTONG UNIV
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