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Preparation method and application of binder capable of improving rate capability of battery

A rate performance and battery technology, applied in the direction of non-polymer adhesive additives, adhesives, secondary batteries, etc., can solve the problems of reducing the content of active main materials, affecting battery capacity, and large proportion of conductive agents, so as to reduce migration Effects of energy barrier, improvement of overall capacity, and improvement of rate performance

Active Publication Date: 2020-12-04
华鼎国联四川电池材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The proportion of conductive agent is relatively large, which will reduce the content of active main materials to a certain extent and affect the capacity of the overall battery

Method used

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  • Preparation method and application of binder capable of improving rate capability of battery
  • Preparation method and application of binder capable of improving rate capability of battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1A

[0053] (1) Add allyl alcohol as a doping aid to the reaction kettle, and heat it to 45°C for a reaction time of 3 hours, then slowly add diisocyanate (acryl alcohol: diisocyanate = 2.1:1, molar ratio) to carry out Nucleophilic reaction to give reactant A 1 ;

[0054] (2) Mix the binder acrylic acid monomer, water medium and initiator persulfate, heat to 45°C, and then add the reactant A obtained in step (1) 1 , and then slowly feed acetylene gas to obtain acrylic acid polymer B with a smaller molecular weight 1 ;

[0055] Wherein acrylic acid monomer: water medium=1:2.5 (mass ratio), persulfate accounts for 0.06% of the mass of acrylic acid monomer; reactant A 1 Accounting for 6% of the mass of acrylic acid monomer; Acetylene accounts for 20% of the mass of acrylic monomer;

[0056] (3) Reactant B 1 , the substance styrene containing electron-conducting groups, the substance containing ion-conducting groups lithium styrene sulfonate and the initiator persulfate are mixed,...

Embodiment 1B

[0063] Take the finished product PAA1 of the adhesive in Example 1A, use the polyacrylic acid adhesive PAA1 and the negative electrode polyacrylic acid adhesive PAA0 commonly used in the industry for the negative electrode graphite material on the lithium ion battery, and carry out the new material test experiment with matching the lithium element. The test items are as follows.

[0064] Table 1 The method and instrument used for testing adhesive products

[0065]

[0066]

[0067] Remarks: The test voltage range of the positive electrode material is 3.0V-4.3V; the test voltage range of the negative electrode material is 5mV-2.0V.

[0068] Ionic conductivity of PAA1 at room temperature 5×10 -4 S / cm, electronic conductivity 8×10 -3 S / cm;

[0069] The capacity retention rates of the battery (using PAA1) at 25°C at 1.5C, 2C, and 2.5C / 0.5C are 89.2%, 85.2%, and 81.6%, respectively. 25°C 1C / 1C cycle 200T battery capacity retention rate is 92.5%.

[0070] The capacity ret...

Embodiment 2

[0073] (1) Mix the binder vinylidene fluoride monomer, water medium and initiator AIBN (azobisisobutyronitrile), heat to 45°C, then add the doping group substance pyrrole monomer and crosslinking aid acrylic acid, and then slowly feed acetylene gas to obtain acrylic acid polymer B with a smaller molecular weight 2 ;

[0074] Vinylidene fluoride monomer: water medium = 1:4, AIBN accounts for 0.08% of the mass of vinylidene fluoride monomer; pyrrole monomer accounts for 5% of the mass of vinylidene fluoride monomer; acrylic acid accounts for 0.2% of the mass of vinylidene fluoride monomer ; Acetylene accounts for 20% of the mass of vinylidene fluoride monomer;

[0075] (2) Reactant B 2 , material aniline monomer containing electron conducting group, material p-styrenesulfonate lithium and initiator AIBN containing ion conducting group are mixed, and heated to 90°C to obtain grafted improved vinylidene fluoride polymer C1 2 (Molecular weight is about 30,000);

[0076] where A...

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Abstract

The invention belongs to the technical field of battery materials, and particularly relates to a preparation method and application of a binder capable of improving the rate capability of a battery. The binder provided by the invention of the lithium ion battery is mainly obtained by taking a substance containing an electron conductive group, a substance containing an ion conductive group, a substance containing a doping group and the like as main raw materials through polymerization reaction, so that electron and ion migration energy barriers can be reduced, polarization and internal resistance can be reduced, and the rate capability of the battery can be improved; and the electron delocalization group can form a strong double-electric-layer structure with a current collector. In addition, the macromolecular polymer in the main body group of the binder can improve the binding power between molecules and between molecules and an active material and a conductive agent, and the micromolecular polymer has low Tg and can be effectively infiltrated and adhered to the current collector, so that the cycle performance of the battery is improved. The intrinsic conductivity and the binding power of the binder are improved, so that the dosage of the conductive agent and the binder can be reduced, and the overall capacity of the lithium battery is improved.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a preparation method and application of a binder capable of improving battery rate performance. Background technique [0002] Due to its high energy density, lithium-ion batteries have played an increasingly important role in new energy sources. The energy density of lithium-ion batteries exceeds 150WhKg -1 , which is almost the highest energy density of all known secondary batteries. In order to further improve the performance of lithium-ion batteries, researchers try to find new electrode materials, electrolytes and additives. However, the efficiency of lithium-ion batteries depends largely on the optimization of electrode preparation conditions. One of the most important aspects is to find the used electrode materials. The most suitable binder for electrodes. The binder is a very important part of the positive and negative electrode materials of lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J151/00C09J11/06C08F265/02C08F212/08C08F212/14C08F259/08C08F220/06H01M4/62H01M10/0525
CPCC09J151/003C09J11/06C08F265/02C08F259/08H01M4/621H01M10/0525C08K5/053C08K5/02C08F212/08C08F212/30C08F220/06Y02E60/10
Inventor 李娟马艳唐姚庄卫东孙延先
Owner 华鼎国联四川电池材料有限公司
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