Aqueous slurries for battery electrodes

A slurry and battery technology, applied in the field of electrodes, can solve problems such as unsuccessful implementation

Active Publication Date: 2017-03-01
LECLANCHE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of PVDF is that PVDF can only be dissolved in some specific organic solvents such as acetone, the use of which requires specific handling operations, production standards, and the need to recycle organic solvents in an environmentally friendly manner
[0010] These and other attempts have been made to combine PVDF with water-based slurries in order to take advantage of the known advantages of PVDF as a binder for electrode slurries without the use of organic slurries that require special handling during production. solvents, but so far have not been successful in achieving this goal

Method used

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  • Aqueous slurries for battery electrodes
  • Aqueous slurries for battery electrodes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1-Anode electrode slurry

[0036] The graphite electrode slurry may contain 2% CMC or PAA, 5% SBR, 3% PVDF, 2% carbon black, and 88% graphite. The above components can be mixed into a slurry in an aqueous solution. The aqueous solution may be deionized water. Latex can be added to the solution to keep PVDF in a stable dispersed state. The materials used are commercially available. No other materials are used. The water content depends on the active materials, binders and other conductive materials used in the slurry, and their concentration.

Embodiment 2

[0037] Example 2-Cathode electrode slurry

[0038] The cathode slurry can be formed by mixing 4% by weight of CMC or PAA, 6% by weight of SBR, 3% by weight of PVDF, 6% by weight of carbon black, and 88% by weight of LFP or another metal oxide. . Latex can be added to the solution to keep PVDF in a stable dispersed state. PVDF is used as a binder and acetone is used as a solvent to prepare Li-NCO in this scheme. However, the following materials can also be used to prepare Li-NCO electrodes: NMP, water, acetone, DMAC or other organic solvents.

[0039] The above-mentioned slurry was applied to the anode current collector and the cathode current collector, respectively. The current collector may be made of any known material, such as aluminum or copper, and may be in the form of metal foil. The cathode and anode thus prepared are inserted into an electrochemical cell, and the two are separated by a separator.

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Abstract

The present invention relates to aqueous slurries for battery electrodes, in particular slurries or pastes for the preparation of electrodes for secondary batteries, such as electrochemical cells containing lithium ions. The slurry contained a water-based binder containing CMC, SBR and PVDF as binder materials.

Description

Technical field [0001] The present invention relates to electrodes for secondary batteries. Specifically, the present invention relates to a slurry or paste for electrochemical cells containing lithium ions. Background technique [0002] Generally, electrodes for electrochemical cells are prepared by attaching electrochemically active electrode materials to current collectors. Known current collectors are rigid supports or flexible metal foils made of conductive materials. Examples of widely used current collector materials include copper or aluminum, but other materials can also be used. The method of attaching the electrochemically active electrode material to the current collector includes lamination, pasting with an adhesive, or coating. These methods of preparing electrodes are widely used in the prior art. [0003] A wide variety of electrochemically activatable electrode materials or electrochemically active electrode materials are known for preparing anodes and cathodes...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01M4/62
CPCH01M4/622H01M4/8828H01M4/623Y02E60/50Y02E60/10H01M4/621H01M4/0404H01M4/131H01M4/133H01M4/139H01M4/1391H01M4/1393H01M4/62H01M10/052Y02P70/50
Inventor希勒米·布卡沃尔那·沙伊费勒皮埃尔·博朗
OwnerLECLANCHE SA