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Plating metal negative electrodes under protective coatings

A protective layer and electrode technology, applied in battery electrodes, primary battery electrodes, electrode manufacturing, etc., can solve problems such as lack of effective mechanisms for negative electrodes

Inactive Publication Date: 2001-05-30
POLYPLUS BATTERY CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Therefore, lithium battery technology currently lacks an effective mechanism to protect the negative electrode of lithium.

Method used

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  • Plating metal negative electrodes under protective coatings
  • Plating metal negative electrodes under protective coatings
  • Plating metal negative electrodes under protective coatings

Examples

Experimental program
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Effect test

Embodiment

[0108] The following results have been observed:

[0109] 1. In an aprotic solvent in the presence of lithium polysulfides, as in the catholyte, luminescent lithium can be electroplated through the LIPON layer onto the copper surface (Example 1). Under similar conditions, electroplating onto bare copper foil would not produce any lithium coating.

[0110] 2. The lithium-plated LIPON / copper structure is available as an anode. Example 2 shows its recyclability in the presence of catholyte.

[0111] 3. The electroplated lithium is still basically fully anode active. Example 3 shows that the lithium availability after 20 cycles is at least 98% of the initial anode active lithium.

[0112] The experimental system was prepared as follows. LIPON / copper composites were made by sputtering LIPON on the copper film, similar to the method described by Bate et al. References are made for this purpose. LIPON targets were prepared by simple melting. By heating 11.5 grams of lithium ph...

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Abstract

A method for forming lithium electrodes having protective layers involves plating lithium (16) between a lithium ion conductive protective layer (18) and a current collector (14) of an 'electrode precursor'. The electrode precursor is formed by depositing the protective layer on a very smooth surface of a current collector. The protective layer is a glass such as lithium phosphorus oxynitride and the current collector is a conductive sheet such as a copper sheet. During plating, lithium ions move through the protective layer and a lithium metal layer plates onto the surface of the current collector. The resulting structure is a protected lithium electrode. To facilitate uniform lithium plating, the electrode precursor may include a 'wetting layer' which coats the current collector.

Description

background of the invention [0001] The present invention relates to negative electrodes for use in batteries (such as lithium electrodes for use in lithium-sulfur batteries). In particular, the present invention relates to methods of forming alkali metal electrodes with thin glass or amorphous protective layers. [0002] In theory, certain alkali metal electrodes may provide extremely high energy density batteries. The low equivalent weight of lithium makes lithium an attractive electrode component for batteries. Lithium provides more energy per unit volume than conventional nickel-cadmium battery standards. Unfortunately, rechargeable lithium metal batteries have not been successful in the market. [0003] The failure of rechargeable lithium metal batteries is largely due to battery cycling issues. During repeated charge and discharge cycles, lithium "dendrites" gradually grow from the lithium metal cell through the electrolyte and eventually come into contact with the po...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M2/16H01M4/04H01M4/12H01M4/134H01M4/1395H01M4/62H01M6/14H01M6/18H01M10/052H01M10/054H01M10/36H01M10/44
CPCH01M4/12H01M10/052H01M4/0459H01M4/661H01M10/446H01M4/0461H01M4/045H01M4/134H01M10/0562Y02E60/122H01M10/054H01M2/1673H01M4/1395H01M4/0438H01M4/0452Y10T29/49108Y10T29/49115H01M50/46H01M4/02H01M4/04
Inventor M·Y·楚S·J·维斯科L·C·德荣赫
Owner POLYPLUS BATTERY CO INC
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