Cell with at least one inlaid lithium electrode

A battery and electrode technology, applied in organic electrolyte batteries, non-aqueous electrolyte batteries, electrode carriers/collectors, etc., can solve the problems of expensive metal mesh, increased rolling pressure and annealing process, etc.

Inactive Publication Date: 2002-10-02
VARTA MICROBATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fabricating metal mesh from foil is expensive, often adding rolling and annealing steps in addition to unavoidable waste

Method used

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  • Cell with at least one inlaid lithium electrode
  • Cell with at least one inlaid lithium electrode
  • Cell with at least one inlaid lithium electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] To make the negative electrode, 250ml of acetone and 27.8g of PVDF-HFP (Powerflex, ElfAtochem Company) were put into a 500ml Erlenmeyer flask and heated to 42°C in a water bath. Stir with an IKA mixer until the polymer is completely dissolved. Then add 6.2g of conductive carbon black (SuperP, Sedema Company) and 275.3g of spherical graphite (MCMB 25-28, Osaka Gas Company) and stir for 2 hours, and adjust the number of revolutions (Drehstufe) to such an intensity that it does not stir in Air.

[0026] For the positive electrode, the same process method will be followed, here 24.8g PVDF-HFP (Powerflex, Elf Atochem Company), 2.6g conductive carbon black (Super P.Sedema Company), 2.6g graphite (KS 6 Timcal Company) are used as conductive The property modifier and 276.2g of lithium cobalt oxide (FMC) were added to 250ml of acetone.

[0027] Negative electrode and positive electrode are manufactured by cast-assisted belt method, and their surface weight is 19-21g / cm 2 . M...

Embodiment 2

[0031] The material for the negative electrode was prepared according to Example 1 and was applied directly to a Cu-conductor electrode surface-treated according to the invention (surface treatment by electrochemical deposition of copper crystallites) instead of on a polyester foil . The solvent was allowed to evaporate, and the electrode adhered well to the conductor electrode in the dry state. In this way, the preparation scheme is composed of one bicell instead of six bicells. Example 3:

Embodiment 3

[0032]To make the negative electrode, 1 liter of acetone was placed in a 2 liter Erlenmeyer flask together with 123.7 g of PVDF-HFP (Powerflex, Elf Atochem) and heated to 42° C. in a water bath. Stir with an IKA mixer until the polymer is completely dissolved. Then add 261.2g dibutyl phthalate, 27.5g conductive carbon black (Super P.Sedema company) and 962g spherical graphite (MCMB 25-28, Osaka Gas company) and stir 2 hours, the number of revolutions is adjusted to such intensity, Just enough not to stir in the air.

[0033] For the positive electrode, the same process method will be followed, where 99.0 g of PVDF-HFP (Powerflex, Elf Atochem Company), 165.1 g of dibutyl phthalate, 66.0 g of conductive carbon black (Super P , Sedema Company) as a conductivity modifier and 939.7g lithium cobalt oxide (FMC).

[0034] Negative electrode and positive electrode are manufactured by cast-assisted belt method, and their surface weight is 19-21g / cm 2 . Mylar (polyester foil) was use...

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Abstract

The invention relates to a battery having at least one lithium-intercalated electrode, the electrochemically active material of which is coated on a metallic conductor in the form of a foil, provided that a second metal or the same metal is electrochemically deposited on its surface. If there are crystallites of the metal, the crystallites increase the contact area and reduce the transition resistance to the active material. The carrier material is selected from Al, Cu, V, Ti, Cr, Fe, Ni, Co or alloys of these metals or is selected from corrosion-resistant stainless steel, and the deposited metal is selected from Cu, V, Ti, Cr, Fe, Ni , Co, Zn, Sn, In, Sb, Bi, Ag or alloys of these metals. The microcrystalline size of the electrochemical deposition material is 1-25 μm, preferably 1-10 μm, and at most 10 microcrystalline layers, preferably 1-3 microcrystalline layers are deposited on the carrier foil.

Description

technical field [0001] The invention relates to a battery with at least one lithium-intercalated electrode, the electrochemically active substance of which is applied to a foil-shaped metal conductor. Background technique [0002] In a battery, the connection of the conductive electrode and the electrochemically active material plays a decisive role in the function of the battery. Purely mechanical disconnection or disconnection caused by the electrochemical structure of the inert layer is the most common cause of battery failure. [0003] Various conductor materials are known for electrodes intercalating lithium. US-Patent 6 143 444 A1 reports the direct bonding of active materials to porous foils or webs made of aluminum or copper. [0004] From WO 98 / 20566 conductor grids of copper or aluminum are known which are cleaned, chemically etched and then coated with an adhesive. [0005] Document US 5 631 104 A1 discloses a conductor foil consisting of aluminum and copper, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/13H01M4/66H01M6/16
CPCH01M4/13H01M4/661H01M4/662H01M4/667Y02E60/10H01M4/38
Inventor P·豪格P·比尔克K·霍尔D·伊利克
Owner VARTA MICROBATTERY
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