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Water-based conductive binder for lithium ion battery and preparation method of water-based conductive binder

A conductive adhesive and lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficulty in dispersion, affecting lithium ion transmission and diffusion speed, and poor bonding strength of adhesives

Pending Publication Date: 2021-07-06
无锡零一未来新材料技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dispersion of traditional carbon nanotube slurry is difficult, the compatibility is poor and the bonding strength of the binder is not good; when the length of carbon nanotubes is long, the transmission and diffusion speed of lithium ions are affected

Method used

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  • Water-based conductive binder for lithium ion battery and preparation method of water-based conductive binder
  • Water-based conductive binder for lithium ion battery and preparation method of water-based conductive binder
  • Water-based conductive binder for lithium ion battery and preparation method of water-based conductive binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A water-based conductive binder for lithium-ion batteries, comprising the following components in parts by weight:

[0028] Basic binder: 20 parts of sodium carboxymethylcellulose, 100 parts of functional binder, intrinsic conductive polymer: 5 parts of polyaniline, 2 parts of hydroxyl modified single-wall carbon tubes, 1000 parts of deionized water, Neutralizer: 0.2 parts of ammonia water, curing agent: 0.5 parts of Covestro curing agent 401-70.

[0029] Preparation method: comprising the following steps:

[0030] (1) Preparation of intrinsic conductive mother liquor: Mix 5 parts of intrinsic conductive polymer polyaniline and 20 parts of basic binder sodium carboxymethyl cellulose in parts by mass, and pass through a planetary disperser at room temperature at 12000r / Min speed range for pre-dispersion, add deionized water to adjust the viscosity, and make intrinsic conductive mother liquid;

[0031] (2) Preparation of functional binder: At room temperature, mix mono...

Embodiment 2

[0035] A water-based conductive binder for lithium ion batteries, comprising the following components in parts by weight: basic binder: 30 parts of styrene-butadiene copolymer, functional binder: 100 parts, intrinsically conductive Polymer: 10 parts of polyaniline, 10 parts of amino-modified single-wall carbon tube, 1000 parts of deionized water, neutralizer: 0.1 part of sodium hydroxide, 2 parts of Covestro curing agent 401-70.

[0036] The preparation method comprises the following steps:

[0037] (1) Preparation of intrinsic conductive mother liquor: mix 10 parts of intrinsic conductive polymer polyaniline and 30 parts of basic binder styrene butadiene copolymer in parts by mass, pre-disperse at room temperature, add deionized Water adjusts the viscosity to obtain the intrinsic conductive mother liquid;

[0038](2) Preparation of functional binder: at room temperature, mix monomers containing hydroxyl groups with ionized water according to the set solid content, add emulsi...

Embodiment 3

[0042] A water-based conductive binder for lithium-ion batteries, comprising the following components in parts by weight: basic binder: 20 parts of styrene-butadiene copolymer, 120 parts of functional binder, intrinsically conductive polymer Materials: 10 parts of polythiophene, 20 parts of amino-modified multi-walled carbon tubes, 1000 parts of deionized water, neutralizer: 0.1 part of sodium hydroxide, 2 parts of Covestro curing agent 304.

[0043] (1) Preparation of intrinsic conductive mother liquor: mix 10 parts of intrinsic conductive polymer polythiophene and 20 parts of basic binder styrene butadiene copolymer in parts by mass, pre-disperse at room temperature, add deionized Water adjusts the viscosity to obtain the intrinsic conductive mother liquid;

[0044] (2) Preparation of functional binder: at room temperature, mix monomers containing hydroxyl groups with ionized water according to the set solid content, add emulsifier, stir and emulsify to obtain monomer mixtur...

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Abstract

The invention relates to a water-based conductive binder for a lithium ion battery and a preparation method of the water-based conductive binder, and the water-based conductive binder comprises the following components in parts by weight: 10-30 parts of a basic binder, 90-120 parts of a functional binder, 2-10 parts of an intrinsic conductive polymer, 2-20 parts of modified carbon nanotubes, 1000 parts of deionized water and 0.7-4.1 parts of an auxiliary agent. The preparation method is simple, the steps are easy to operate, the prepared water-based conductive adhesive has relatively high conductivity, a pole piece of the water-based conductive adhesive is high in peel strength, good in adhesive force and low in dosage, lithium ions can be easily embedded / embedded out, the performance of an active material is fully played, the internal resistance value of a battery is smaller, the gram capacity of a positive electrode is better played, and in a cycle, the capacity loss is less, and the cycle retention rate is higher.

Description

technical field [0001] The invention relates to a water-based conductive binder for lithium ion batteries and a preparation method thereof, belonging to the technical field of lithium ion batteries. Background technique [0002] The wide range of applications of lithium-ion batteries has become an indispensable part of our daily life. In order to meet the higher development requirements faced by lithium-ion batteries, improving the energy density of lithium-ion batteries has become the research of major battery factories and material factories. direction. In lithium-ion batteries, it is mainly divided into positive electrode, negative electrode, electrolyte, and separator. If energy density is to be increased, it is necessary to improve the performance of active materials. Conductive agent and binder are two important components in positive and negative electrode materials. Active materials, conductive materials, and binders are added to the positive and negative electrode...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M4/623H01M10/0525Y02E60/10
Inventor 董仕晋岳敏吕竞飞蔡亚琪
Owner 无锡零一未来新材料技术研究院有限公司
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