Method for manufacturing a zinc electrode by wet process

A zinc electrode and manufacturing method technology, applied in the field of electrochemical cells, can solve the problems of complex electrode manufacturing method, inability to effectively limit the formation of dendrites, etc.

Pending Publication Date: 2020-06-30
ELECTRICITE DE FRANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the solution proposed in this application requires specific tools, which complicates the fabrication method of the electrodes
In addition, calcium zincate is not always uniformly distributed within the electrode, which cannot effectively limit the formation of dendrites

Method used

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  • Method for manufacturing a zinc electrode by wet process

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Embodiment Construction

[0119] Zinc electrodes were prepared by the method according to the invention.

[0120] In the case of this example, the reagent amounts shown in Table 1 were used.

[0121] [Table 1]

[0122] Reagent quantity ZnO 150g Ca(OH) 2

30g Deionized water 30mL PTFE 20mL ethanol 30mL

[0123] Zinc oxide powder (Merck Emsure) was mechanically mixed with calcium hydroxide (Merck) in a mixer at 23°C for 5 minutes. While keeping the mixer running, add deionized water to the mixture at a constant rate over about 30 seconds while providing good mixture homogeneity. Adding water will form calcium zincate crystals.

[0124] The mixture was kept under stirring for 3 minutes. Then, a 60% strength aqueous suspension of PTFE (Aldrich) was added within 1 minute.

[0125] The mixture was kept stirring again for 5 minutes, during which time calcium zincate crystals continued to form and grow.

[0126] The maturation reaction was interrupted b...

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Abstract

Disclosed is a production method for a zinc electrode with in situ formation of calcium zincate crystals. The method includes notably the steps of preparation of a mixture, growth of crystals, slowingof the growth and production of the electrode.

Description

technical field [0001] The present invention relates to the field of electrochemical cells, and more particularly to methods of production of specific zinc electrodes. Background technique [0002] Metallic zinc negative electrodes are particularly attractive for batteries because they have high gravimetric capacity (820 Ah / kg Zn), can be cycled charge and discharge in aqueous electrolytes, and are made from abundant, nontoxic, and low-cost raw materials. . [0003] Zinc electrodes are used in several types of batteries that use alkaline electrodes. For example, zinc electrodes can be used in zinc-manganese dioxide batteries (commonly called "alkaline batteries") or zinc-air batteries (for example in hearing aids). These two example batteries are not designed to be rechargeable, and their zinc-based anodes work by electrochemically converting metallic zinc to zinc oxide (reaction according to Equation 1) or to zincate [Zn(OH) 4 ] 2- while working (reaction according to E...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/08H01M4/1395H01M10/30H01M6/06
CPCH01M4/08H01M4/1395H01M10/30H01M6/06H01M2004/027H01M4/0435H01M4/244H01M4/623H01M4/0497Y02E60/10H01M4/043H01M10/36
Inventor 菲利普·史蒂文斯格韦纳埃勒·陶萨因特
Owner ELECTRICITE DE FRANCE
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