Battery aqueous adhesive, and electrode and battery using same

A binder and water-based technology, applied in the field of battery water-based binders, electrodes and batteries, can solve the problems of unstable battery performance and poor adhesion, and achieve strong adhesion, stable performance, and lower battery internal resistance. Effect

Active Publication Date: 2011-07-06
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the existing water-based bin

Method used

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  • Battery aqueous adhesive, and electrode and battery using same
  • Battery aqueous adhesive, and electrode and battery using same
  • Battery aqueous adhesive, and electrode and battery using same

Examples

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preparation example Construction

[0029] The preparation method of the branched polyacrylonitrile of the present invention can be prepared by a conventional synthesis method in the art. For example, polyacrylonitrile can be first synthesized by acrylonitrile monomer, and then part of the side nitrile group (-CN) can be reduced to amine group (-CH by chemical reduction method). 2 -NH 2 ), and then substitute at the amine position and initiate condensation reactions, etc.

[0030] Preferably, the specific detailed steps are: placing the polyacrylonitrile homopolymerized by the acrylonitrile monomer in a sealable glass container, stirring at a low speed, and adding external circulating cooling water. At normal temperature, under the protection of anhydrous and oxygen-free helium, an appropriate amount of lithium aluminum hydride was added thereto, and the reaction was carried out for 0.5 hours.

[0031] The product after the reaction is separated and purified, dissolved in slightly hot alcohol, and a small amou...

Embodiment 1

[0042] ① Binder: use branched polyacrylonitrile as the binder, and the R in the branched polyacrylonitrile 1 , R 2 Both are methyl, and their number average molecular weight is 9.8×10 5 , unit A accounts for 90wt%, and unit B accounts for 10wt%.

[0043] ② Preparation of slurry: Disperse the binder in water and stir the solution to make the concentration 10%. Add the conductive agent therein, stir for 8 minutes at a rotating speed of 800 rad / min, and then stir for 30 min at a rotating speed of 2000 rad / min. Then add active material therein, stir for 30min at the rotation speed of 1500rad / min, and then stir for 150min at the rotation speed of 2000rad / min.

[0044] When preparing the positive electrode slurry, the active material of the positive electrode is lithium iron cobalt phosphate, and the conductive agent is a mixture of Super-P and KS-6 graphite.

[0045] When preparing the negative electrode slurry, graphite is used as the negative electrode active material, and a ...

Embodiment 2

[0049] The difference from Example 1 is that the number average molecular weight of the binder is 5×10 3 branched polyacrylonitrile.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular discloses a battery aqueous adhesive. The adhesive comprises branched polyacrylonitrile, wherein the branched polyacrylonitrile consists of a structural unit A and a structural unit B; the unit A has a general formula which is shown in the specifications, and the unit B has a general formula which is shown inthe specifications; and R1 and R2 are one independently selected from C1 to C4 alkyl groups respectively. The invention also discloses an electrode and a battery using the adhesive. The battery aqueous adhesive provided by the invention has high adhesion and stable performance and cannot be degraded or stripped along with charge and discharge, and the capacity cannot be reduced, so that the service life of the battery can be effectively prolonged. The adhesive can also replenish lithium ions to a positive electrode, so that the utilization rate of the lithium ions is improved. The adhesive isparticularly suitable for positive aqueous slurry.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a water-based binder for batteries, an electrode and a battery using the binder. Background technique [0002] Electrode paste generally includes: positive / negative active material, conductive agent, binder, solvent and other additives. [0003] At present, lithium-ion batteries generally use an organic pulping process, that is, an organic solvent is used as a solvent for the slurry. The most commonly used combination is: N-methylpyrrolidone (NMP) as solvent and polyvinylidene fluoride (PVDF) as binder. However, in lithium-ion batteries, PVDF is easy to swell in the organic electrolyte, which can easily cause changes in the structure of the pole pieces, resulting in unstable battery performance. Moreover, the organic pulping process must strictly control the moisture in the environment, resulting in high process costs and high environmental pressure, w...

Claims

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Application Information

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IPC IPC(8): H01M4/62C09J133/20H01M4/13H01M10/0525
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 张忠财朱小明梁世硕
Owner BYD CO LTD
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