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Adhesive and preparation method thereof, silicon-carbon negative electrode material and lithium battery

A technology of adhesive and silicon carbon, applied in the direction of negative electrode, adhesive, secondary battery, etc., can solve the problem of lack of adhesive of silicon carbon negative electrode material, etc.

Active Publication Date: 2021-03-09
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of binder and its preparation method, and silicon-carbon anode material and lithium battery, to solve the binder that is suitable for silicon-carbon anode material in the prior art The problem

Method used

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  • Adhesive and preparation method thereof, silicon-carbon negative electrode material and lithium battery
  • Adhesive and preparation method thereof, silicon-carbon negative electrode material and lithium battery
  • Adhesive and preparation method thereof, silicon-carbon negative electrode material and lithium battery

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Experimental program
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Embodiment 1

[0052] (1) Get 1.03g polystyrene macroinitiator and 3g 2-(2-methoxyethoxy) ethyl ester monomer and dissolve in N,N-dimethylformamide, and use liquid nitrogen to the reaction system Freezing-pumping-thawing was repeated three times to remove oxygen, then filled with nitrogen and added 0.05g CuBr and 0.06g PMDETA, the molar ratio was 2-(2-methoxyethoxy) ethyl ester monomer:polystyrene Molecular initiator: PMDETA: CuBr=50:1:1:1, the concentration of the monomer is 2.5 mol / L, and the reaction is quenched with liquid nitrogen after reacting at 60° C. for 4 hours. The reacted mixed solution was passed through a neutral alumina column to remove the copper catalyst. The solution was subsequently precipitated three times in a mixed solution of diethyl ether / petroleum ether (volume ratio: 1 / 1) of ten times the volume. Finally, the precipitated product was dried at 40 °C to constant weight to obtain PS-b-P(EO) 2 diblock copolymers.

[0053] (2) Take 0.913g of PS-b-P(EO) prepared in (1...

Embodiment 2

[0057] The preparation method, reaction conditions and purification method of PSEA three-block copolymer copolymer are the same as embodiment 1, but the charging ratio is different, and the stoichiometric ratio of three kinds of blocks is styrene: 2-(2-methoxyethylene Oxy) ethyl ester: acrylic acid = 30:50:600, as binder A2.

[0058] 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.

Embodiment 3

[0060] The preparation method, reaction conditions and purification method of PSEA three-block copolymer copolymer are the same as embodiment 1, but the charging ratio is different, and the stoichiometric ratio of three kinds of blocks is styrene: 2-(2-methoxyethylene Oxy)ethyl ester:acrylic acid=30:60:500, as adhesive A3; see figure 1 It is the infrared spectrogram of the PSEA triblock copolymer copolymer prepared in this embodiment, as can be seen from the figure in the spectrum of PS, 2923cm -1 , 2849cm -1 The absorption peak at corresponds to -CH 2 -Antisymmetric stretching, symmetrical stretching vibration, 1600cm -1 , 1580cm -1 , 1500cm -1 , 1450cm -1 The absorption band at corresponds to the ring vibration of the benzene ring;

[0061] Diblock Polymer PS-b-P(EO) 2 The spectrum is at 1730cm -1 The new absorption peak that appeared nearby corresponds to the stretching vibration of -C=O, at 1246cm -1 , 1105cm -1 The antisymmetric stretching vibration correspondin...

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Abstract

The invention discloses an adhesive, a preparation method thereof, a silicon-carbon negative electrode material and a lithium battery, the adhesive is a multi-block amphiphilic copolymer, organic unification of a hydrophobic polymer and a hydrophilic polymer is realized by copolymerizing polystyrene and polyacrylic acid and regulating the ratio of polystyrene to polyacrylic acid in the adhesive; the prepared amphiphilic block copolymer adhesive can be uniformly dispersed and dissolved in water, so that the bonding effect of polystyrene blocks on carbon and the bonding effect of polyacrylic acid blocks on silicon are respectively exerted; the adhesive has the characteristic of multiple functions, the styrene block can adhere to silicon through hydrophobic interaction and pi-pi stacking action, the polyacrylic acid block can adhere to silicon through hydrogen bonding action, and the poly (2-(2-methoxy ethoxy) ethyl ester block can promote lithium ion conduction.

Description

【Technical field】 [0001] The invention belongs to the technical field of battery materials, and relates to a binder and a preparation method thereof, a silicon-carbon negative electrode material and a lithium battery. 【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, but the energy density of commercial lithium-ion batteries has gradually been unable to meet the needs of large-scale energy storage, and further research and development are needed New electrode materials with higher energy density. [0003] Silicon anode materials have high theoretical specific capacity and great application potential. However, it will experience serious volume expansion during the charging and discharging process, resulting in the destruction of the electrode structure, material pulverization, and eventually lead to battery capacity attenuation. This problem can be ef...

Claims

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Application Information

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IPC IPC(8): C09J153/00C08F293/00C08F8/12H01M4/62H01M4/38H01M10/0525
CPCC08F8/12C08F293/005C08F2438/01C09J153/005H01M4/386H01M4/622H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 宋江选靳谧涵虎琳琳
Owner XI AN JIAOTONG UNIV
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