Aqueous binder and secondary battery

A water-based binder and binder technology, applied in the direction of battery electrodes, binder types, amide/imide polymer binders, etc., can solve the problem of decreased Coulombic efficiency, weak bonding ability, capacity loss, etc. problems, to achieve the effect of simple preparation process, less environmental pollution and easy control

Active Publication Date: 2019-07-02
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although SBR has a certain degree of adhesion and elasticity, it has a point contact connection between the active material particles and the particles and between the particles and the current collector, the bonding ability is weak, and the reversible recovery mechanical properties of the material are also poor.
[0005] Another existing binder used for negative electrode materials is polysaccharide materials, such as sodium alginate, cyclodextrin, chitosan, etc., the mechanical strength of this type of material itself is low, and it is difficult for graphite negative electrodes and silicon-based negative electrodes to inhibit the Limited expansion during charge and discharge, risk of cycle release
[0006] Modified polyacrylic acid (PAA) materials can also be used as binders for negative electrode materials, but these materials will react with ions during the electrode intercalation process, resulting in capacity loss and a decrease in the first Coulombic efficiency. Poor fatigue resistance and poor wettability to the electrolyte, resulting in poor dynamic performance of the negative electrode

Method used

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  • Aqueous binder and secondary battery
  • Aqueous binder and secondary battery
  • Aqueous binder and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0061] 1. Preparation of binder:

[0062] Add a certain amount of solvent (a mixed solvent of N,N-dimethylformamide and water) into a four-necked flask equipped with a condenser, a stirrer and a thermometer, and heat it to 90°C after passing argon for 30 minutes; Under the protection of argon, drop in the amount of ethylenically unsaturated amide sulfonic acid monomer (formula (I) monomer unit), ethylenically unsaturated ester monomer (formula (II)-1 or formula (II) -2 monomer units) and azobisisobutyronitrile; after the dropwise addition, the reaction is kept for a set time, and the solution is cooled to room temperature and then spray-dried to obtain a solid powder of the binder.

[0063] By adjusting the molar content of the two monomer units, four different binders were prepared. The specific reaction conditions and the molar ratio of monomer feed are shown in Table 1-1. The specific composition and number average molecular weight of the obtained binder As shown in Table ...

Embodiment 6-9

[0130] Prepare binder by the method for embodiment 1, comprise structural formula (I) monomer unit in the structure of this polymer as the first component, structural formula (II)-1 monomer unit is the second component, wherein structural formula and two The composition ratio of the monomer units is shown in Table 8.

[0131] Table 8: Binder Compositions of Examples 6-9

[0132]

[0133] According to the method of Example 1, the adhesive of the structural formula of Example 6-9 was prepared, and the adhesive of Example 6-9 also had excellent self-healing properties and was significantly better than the adhesion to the pole piece of the comparative example. Relay, in addition, the performance of the prepared lithium ion battery is similar to that of the aforementioned Examples 1-4.

Embodiment 10-13

[0135] Prepare binder by the method for embodiment 1, comprise structural formula (I) monomer unit in the structure of this polymer and be the first component, structural formula (II)-2 monomer unit is the second component, wherein structural formula and two The composition ratio of each monomer unit is shown in Table 9.

[0136] Table 9: Binder Compositions of Examples 10-13

[0137]

[0138] According to the method of Example 1, the adhesive of the structural formula of Example 10-13 was prepared, and the adhesive of Example 10-13 also had excellent self-healing properties and was significantly better than the adhesion of the pole piece of the comparative example. Relay, in addition, the performance of the prepared lithium ion battery is similar to that of the aforementioned Examples 1-4.

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Abstract

The invention discloses an aqueous binder and a secondary battery. The binder has self-repairing capability and is a polymer containing at least two kinds of monomeric units, wherein one monomer simultaneously contains a sulfonic group and an amido group, and the other monomer contains an alcohol ester group or / and a carboxylate radical. The number-average molecular weight of the polymer is greater than or equal to 200,000 preferably. The invention further relates to the secondary battery. The secondary battery comprises a positive pole piece, a negative pole piece, a barrier film and an electrolyte, wherein at least one of the positive pole piece, the negative pole piece and the barrier film (preferably the negative pole piece) contains the binder disclosed by the invention. Compared withbinders in the prior art, the binder disclosed by the invention has the advantages that the electrochemical stability is high, the binding capacity is high, the mechanical properties are good, the cycle life of the secondary battery can be remarkably prolonged, and the cycle expansion of the secondary battery can be remarkably lowered. Therefore, the binder material has a very good application prospect in the secondary battery.

Description

technical field [0001] The invention relates to the technical field of secondary batteries, in particular to an aqueous binder for a secondary battery and a secondary battery containing the binder. Background technique [0002] Since the birth of secondary batteries, they have been used in many fields. Judging from the current application fields of secondary batteries, not only have they been widely used in electronic products such as mobile phones and chargers, but they have also made certain breakthroughs in the fields of vehicle power supplies and energy storage systems. At present, most of the anode materials of commercialized secondary batteries are graphite or various carbon materials synthesized with graphite as the precursor, and its theoretical lithium storage capacity (372mAh / g) has reached the limit. From the perspective of future power battery demand for high energy density Look can not meet the requirements. The next-generation silicon-based negative electro...

Claims

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Application Information

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IPC IPC(8): C09J133/24C08F220/58C08F218/08H01M4/62
CPCC09J133/24C08F220/1802C08F220/585H01M4/622C08F218/08C08F220/06C08F220/10H01M4/62Y02E60/10
Inventor 吴博王龙郑义钟泽
Owner CONTEMPORARY AMPEREX TECH CO
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