Lithium-ion battery electrode prepared by water-based binder

A lithium ion battery, water-based binder technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of accelerating lithium ion conduction rate, polyvinylidene fluoride can not be used as high specific capacity electrode binder, etc. problems, to achieve excellent rate performance and cycle performance, low price, and maintain stability.

Active Publication Date: 2018-08-31
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problem that polyvinylidene fluoride cannot be used as a high specific capacity electrode binder in the prior art, the present invention proposes a lithium-ion battery electrode prepared by a water-based binder. The lithium-ion battery electrode uses a new type of water The base binder can improve the bonding force and elasticity at the same time, and at the same time, it can increase the liquid absorption rate of the electrolyte, accelerate the lithium ion conduction rate, and maintain the excellent performance of the lithium ion battery electrode.

Method used

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Examples

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Effect test

Embodiment 1

[0023] Coating the positive electrode slurry of the lithium ion battery on an aluminum foil to prepare the positive electrode of the lithium ion battery has a thickness of 50 microns. The weight ratio formula of each raw material in the slurry is: 60 parts by weight of lithium iron phosphate, 15 parts by weight of SP-Li, 7.5 parts by weight of binder, 7.5 parts by weight of sodium carboxymethyl cellulose, and 30 parts by weight of dispersion medium. Among them, the theoretical specific capacity of lithium iron phosphate is 170mAh / g; the binder is styrene / methyl acrylate / styrene block copolymer, and the structure of the block copolymer is R-AA 10 -b-St 15 -b-MA 8000 -b-St 15 ; The dispersion medium is deionized water.

[0024] The lithium-ion battery positive electrode slurry is prepared by the following processing technology: ①Add water to sodium carboxymethyl cellulose and magnetically stir for 60 minutes, put SP-Li and lithium iron phosphate particles into a planetary hig...

Embodiment 2

[0027] Coating the negative electrode slurry of the lithium ion battery on the copper foil to prepare the negative electrode of the lithium ion battery has a thickness of 50 microns. The weight ratio formula of each raw material in the slurry is: 60 parts by weight of graphite, 15 parts by weight of Ketjen black, 7.5 parts by weight of binder, 7.5 parts by weight of sodium carboxymethyl cellulose, and 30 parts by weight of dispersion medium. Among them, the theoretical specific capacity of graphite is 372mAh / g; the binder is styrene / methyl acrylate / styrene block copolymer, and the structure of the block copolymer is R-AA 10 -b-St 15 -b-MA 8000 -b-St 15 ; The dispersion medium is distilled water.

[0028]The lithium-ion battery negative electrode slurry is prepared by the following processing technology: ① Add water to sodium carboxymethyl cellulose and magnetically stir for 60 minutes, put Ketjen black and graphite particles into a planetary high-energy ball mill for dry gr...

Embodiment 3

[0031] Coating the positive electrode slurry of the lithium ion battery on an aluminum foil to prepare the positive electrode of the lithium ion battery has a thickness of 300 microns. The weight ratio formula of each raw material in the slurry is: 96 parts by weight of lithium iron phosphate, 1 part by weight of conductive graphite, 7.5 parts by weight of binder, 1 part by weight of polyacrylic acid, and 400 parts by weight of dispersion medium. Among them, the theoretical specific capacity of lithium iron phosphate is 170mAh / g; the binder is styrene / methyl acrylate / styrene block copolymer, and the structure of the block copolymer is R-AA 40 -b-St 8000 -b-MA 50 -b-St 8000 ; The dispersion medium is pure water.

[0032] The lithium ion battery positive electrode slurry is prepared by the following processing technology: ① Add water to polyacrylic acid and magnetically stir for 120 minutes, put conductive graphite and lithium iron phosphate into a planetary high-energy ball ...

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Abstract

The invention discloses a lithium-ion battery electrode prepared by a water-based binder. The lithium-ion battery electrode is prepared by coating an aluminum foil or copper foil with an electrode slurry, and the thickness is 50-300 [mu]m; a formula of the electrode slurry comprises 60.0-96.0 parts by weight of an active material, 1.0-20.0 parts by weight of a conductive agent, 1.0-7.5 parts by weight of a binder, 1.0-7.5 parts by weight of a thickener, and 30.0-400.0 parts by weight of a dispersion medium. The active material is selected from lithium iron phosphate, lithium manganate, lithiumcobaltate, graphite and lithium titanate; the binder is an acrylic acid / styrene / methyl acrylate / styrene block copolymer. The binder has extremely high adhesion with active material particles, and hasextremely high elasticity. At the same time, the liquid absorption rate of an electrolyte solution can be improved, the conduction velocity of lithium ions is accelerated, and the performance of thelithium-ion battery electrode is greatly improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery electrode prepared by a water-based binder. Background technique [0002] Lithium batteries are widely used in electric vehicles, portable electronic products and other fields due to their advantages such as high specific capacity, long cycle life, and small self-discharge. However, there are still problems such as short mileage and long charging time of electric vehicles on a single charge; insufficient endurance of portable electronic products and too fast capacity decay. It is urgent to further improve the specific capacity, energy density, and cycle life of lithium batteries. [0003] The electrodes of lithium-ion batteries are mainly composed of active materials, conductive agents and binders. At present, the binders used in actual production are mostly homopolymers or random copolymers, such as polyvinylidene fluoride (PVDF), sodium carboxymethyl ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/136H01M4/62H01M10/0525
CPCH01M4/133H01M4/136H01M4/622H01M10/0525Y02E60/10
Inventor 高翔郑哲楠罗英武
Owner ZHEJIANG UNIV
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