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Lignin-based binder, preparation method thereof, and lithium ion battery

A technology based on lignin and binder, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem that the capacity of silicon-based negative electrode materials cannot approach its theoretical specific capacity, and the specific capacity of silicon-based negative electrode materials cannot be maximized. problems, achieve good bonding effect, good cycle performance, and improve the effect of actual specific capacity

Active Publication Date: 2022-07-05
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] Aiming at the problems that the current lithium-ion battery binder still cannot maximize the specific capacity of the silicon-based negative electrode material in improving the cycle performance of the silicon-based negative electrode material, and the capacity of the silicon-based negative electrode material is still not close to its theoretical specific capacity. The invention provides a lignin-based binder and its preparation method

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  • Lignin-based binder, preparation method thereof, and lithium ion battery
  • Lignin-based binder, preparation method thereof, and lithium ion battery
  • Lignin-based binder, preparation method thereof, and lithium ion battery

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preparation example Construction

[0033] The preparation method at least comprises the following steps:

[0034] The lignin, the first initiator and the organic solvent are mixed to obtain a first mixed material;

[0035] adding the prepolymer to the first mixed material, heating to 30-80° C. in an inert gas atmosphere, and performing a constant temperature reaction for 6-12 hours;

[0036] After the reaction is completed, it is cooled to room temperature and purified to obtain a lignin-based binder.

[0037] The technical solutions of the present invention are further explained in detail below.

[0038] The lignin, one of the raw materials of the present invention, can be alkali lignin, lignosulfonate, sulfonated alkali lignin, sulfonated enzymatic lignin, carboxylated alkali lignin, carboxylated enzymatically hydrolyzed lignin, ammonium alkaloid At least one of lignin and ammonium enzymatic hydrolysis of lignin. The used lignin provides corresponding growth points for obtaining the final product, and afte...

Embodiment 1

[0092] A lignin-based binder is prepared by using alkali lignin, anhydrous calcium chloride, hydrogen peroxide and polyacrylonitrile prepolymer.

[0093] The lignin-based binder is prepared by the following steps:

[0094] (1) under stirring, 10g alkali lignin, 5g anhydrous calcium chloride, 3g hydrogen peroxide, 50g DMSO are placed in the reactor that volume is 500mL and carry out mixing treatment;

[0095] (2) adding 20 g of polyacrylonitrile prepolymer to the reaction kettle treated in step (1), heating to 60° C. at a stirring speed of 250 rpm, and reacting while stirring at 60° C. The reaction time is about 6h;

[0096] (3) the reaction product solution obtained in step (2) is cooled to room temperature, and the cooled reaction solution is separated out in its deionized water, filtered, and the filtrate will be obtained; the filtrate is dissolved in DMF, filtered, and taken The filtrate is then separated out in deionized water, then continues to be solvent in DMF, and fur...

Embodiment 2

[0107] A lignin-based binder is prepared by using alkali lignin, anhydrous calcium chloride, hydrogen peroxide and polyacrylonitrile prepolymer.

[0108] The lignin-based binder is prepared by the following steps:

[0109] (1) under stirring, 10g alkali lignin, 1g anhydrous calcium chloride, 0.5g hydrogen peroxide, 50g DMF are placed in the reactor that volume is 500mL and carry out mixing treatment;

[0110] (2) adding 10 g of polyacrylonitrile prepolymer to the reaction kettle treated in step (1), heating to 60° C. at a stirring speed of 200 rpm, and reacting while stirring at 60° C. The reaction time is about 8h;

[0111] (3) the reaction product solution obtained in step (2) is cooled to room temperature, and the cooled reaction solution is separated out in its deionized water, filtered, and the filtrate will be obtained; the filtrate is dissolved in DMF, filtered, and taken The filtrate is then separated out in deionized water, then continues to be solvent in DMF, and fu...

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Abstract

The invention provides a lignin-based binder, a preparation method and a lithium ion battery. The lignin-based binder is prepared via lignin, a first initiator and a prepolymer; the prepolymer is polyacrylonitrile prepolymer, polyacrylic acid prepolymer, polyacrylate prepolymer, polyacetic acid At least one of ethylene prepolymer, polyethyleneimine prepolymer, or at least one of sodium carboxymethylcellulose activated by the third initiator, sodium alginate, and modified chitosan; the preparation The method includes the following steps: mixing and processing lignin, a first initiator and an organic solvent to obtain a first mixed material; adding the prepolymer to the first mixed material, and heating to a temperature of an inert gas atmosphere 30~80℃, constant temperature reaction for 6~12h; after the reaction is completed, it is cooled to room temperature and purified to obtain a lignin-based binder. The lignin-based binder, modified by nonlinear chains, has a multi-dimensional bonding structure and exhibits good water solubility and bonding effect.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lignin-based binder, a preparation method thereof, and a lithium ion battery. Background technique [0002] As people's awareness of environmental protection and energy crisis continues to increase, lithium-ion batteries are becoming more and more popular as a green and environmentally friendly energy storage technology. At present, commercial lithium-ion batteries mainly use carbon-based materials such as graphite as the negative electrode, but their limited theoretical capacity (372mAh / g) has been almost exhausted, so it is necessary to develop negative electrode materials with higher energy density. High energy density helps to improve the mass energy density or volume energy density of the overall battery. Among the newly developed anode materials, silicon-based (theoretical capacity of silicon 4200mAh / g) anode material is widely used due to its hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/134H01M4/133H01M10/0525
CPCH01M4/622H01M4/134H01M4/133H01M10/0525Y02E60/10
Inventor 邓永红罗超石桥王朝阳
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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