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A kind of binder for lithium ion battery

A lithium-ion battery and binder technology, applied in the direction of adhesives, secondary batteries, battery electrodes, etc., can solve the problem of uneven mixing of electrode active materials and binders, improve cycle stability, increase battery capacity, The effect of improving Coulombic efficiency

Inactive Publication Date: 2018-05-01
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two types of cross-linking binders are mixed with electrode active materials after the cross-linking reaction is completed, which can easily lead to uneven mixing of electrode active materials and binders.

Method used

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  • A kind of binder for lithium ion battery
  • A kind of binder for lithium ion battery
  • A kind of binder for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) First get 1.0g sodium carboxymethylcellulose and dissolve it in 50mL water, stir well to obtain a transparent and viscous sodium carboxymethylcellulose aqueous solution;

[0052] (2) Transfer the aqueous solution to a 250mL three-necked flask, and feed N into the three-necked flask. 2 ;

[0053] (3) Then add 2.5mL acrylic acid monomer, 0.1g (NH 4 ) 2 S 2 o 8 and 0.03g NaHSO 3 , stir and mix evenly, heat up to 55°C, and react for 2h;

[0054] (4) NaOH is added afterwards to adjust the pH of the reaction system=6 to obtain the sodium carboxymethyl cellulose copolymer covalently grafted with polyacrylic acid, and the infrared spectrometer is tested to obtain the following: figure 2 The infrared spectrum shown, according to figure 2 It can be seen that the present embodiment has obtained the sodium polyacrylate covalently grafted sodium carboxymethyl cellulose copolymer; in addition, the cohesive force of this copolymer and other binders is compared, and the re...

Embodiment 2

[0058] The preparation method of the sodium carboxymethyl cellulose copolymer of sodium polyacrylate covalently grafted, reaction conditions and sodium carboxymethyl cellulose charging amount are the same as embodiment 1, but the mass ratio of acrylic acid monomer and sodium carboxymethyl cellulose is 1:4, and the mass ratio of initiator to sodium carboxymethylcellulose is 0.02:1.

[0059] Add 20% SBR to the prepared binder, then mix it with nano-silicon powder and conductive carbon black (mass ratio: 5:80:15) to form a slurry, and coat it on copper foil at 110°C Dry, and then make a button battery with a diaphragm and a lithium cobalt oxide positive electrode; the electrolyte is LiPF 6 carbonate solution. The test result of the lithium-ion battery is that the first coulombic efficiency is 78%; after 100 charge-discharge cycles, the battery capacity is 1220mAh / g.

Embodiment 3

[0061] The preparation method of the sodium carboxymethyl cellulose copolymer of sodium polyacrylate covalently grafted, reaction conditions and sodium carboxymethyl cellulose charging amount are the same as embodiment 1, but the mass ratio of acrylic acid monomer and sodium carboxymethyl cellulose is 70:30, and the mass ratio of initiator to sodium carboxymethyl cellulose is 0.15:1.

[0062] Add 10% sodium alginate to the prepared binder, then mix it with micron silicon powder and conductive carbon black (mass ratio 3:4:3) to form a slurry, and coat it on copper foil, 115 Dry at ℃, and then make a button battery with a diaphragm and a lithium metal sheet. The electrolyte is LiPF 6 carbonate solution. The test result of the lithium-ion battery is that the first coulombic efficiency is 82%; after 100 charge-discharge cycles, the battery capacity is 1840mAh / g.

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Abstract

The invention relates to an adhesive for a lithium ion battery, and discloses an adhesive containing sodium carboxymethyl cellulose copolymers covalently grafted with sodium polyacrylate and an electrode slice and electrochemical device prepared from the adhesive. Compared with an adhesive in the prior art, the adhesive is strong in cohesiveness, good in electrochemical stability and especially suitable for the lithium ion battery with silicon as an anode, the capacity of the lithium ion battery can be remarkably improved, the circulating stability of the battery can be improved, and the coulombic efficiency of the battery can be improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a binder for lithium ion batteries. Background technique [0002] Lithium-ion batteries are currently one of the most extensively researched and in-depth energy storage devices. Because of their advantages such as high capacity density, high cycle life, environmental protection, wide operating temperature range and high safety performance, they are widely used in smartphones, Tablet PCs, electric vehicles and other fields. The performance of the electrode sheets of lithium-ion batteries is one of the key factors determining the performance of lithium-ion batteries, which are mainly composed of electrode active materials, conductive agents, binders and metal current collectors (copper foil or aluminum foil, etc.); It is used to bond electrode active materials and conductive agent particles, and at the same time bond them to the surface of metal current collectors. Therefore,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/02C08F220/06C09J151/02C09J109/06C09J105/04C09J103/02H01M4/62H01M10/0525
CPCC08F251/02C08L2203/20C09J151/02H01M4/622H01M10/0525C08F220/06C08L9/06C08L5/04C08L3/02Y02E60/10
Inventor 魏良明
Owner SHANGHAI JIAOTONG UNIV
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