Gas-shield-electrode and composite bifunctional air-electrode using the same for use in metal-air batteries

一种空气电极、金属电极的技术，应用在燃料电池型的半电池和二次电池型的半电池、电池电极、电路等方向，能够解决没有双功能空气电极和二次金属-空气电池等问题，达到减少总电阻的效果

Active Publication Date: 2015-05-27
AZA HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prior art does not have bifunctional air electrodes and secondary metal-air batteries that can address the issues mentioned above

Method used

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  • Gas-shield-electrode and composite bifunctional air-electrode using the same for use in metal-air batteries
  • Gas-shield-electrode and composite bifunctional air-electrode using the same for use in metal-air batteries
  • Gas-shield-electrode and composite bifunctional air-electrode using the same for use in metal-air batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0214] in passing figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 with Image 6 In the illustrated first exemplary embodiment, we utilize:

[0215] -PTFE suspension (DuPont TM PTFE TE-3893, particle size 0.05μm to 0.5μm, solid content 60%, density 1.5g / cc);

[0216] - Carbon black: Vulcan XC 72R from CABOT (BET 250m 2 / g, 30nm particle size);

[0217] - Activated carbon: SX Plus from Norit (BET 1100m 2 / g)

[0218] -MnO from Merck 2 oxygen reduction catalyst

[0219] The gas diffusion layer is made of 65% carbon black + 35% PTFE, and has a thickness of 0.3mm; the hydrophilic active layer is made of 22% activated carbon + 22% MnO 2 + 46% carbon black + 10% PTFE and has a thickness of 0.6mm; the conductive layer is made of 50μm-100μm thick nickel deposits; and then the hollow space has been milled with a small end with a diameter of 0.75mm using a CNC machine This is done by machine tool drilling 0.4mm-0.5mm deep so that 3 adjacent holes form an equilater...

Embodiment 2

[0237] in passing Figure 8 with Figure 9 In the illustrated second exemplary embodiment, we utilize:

[0238] - an air electrode prepared as described for Example 1, comprising a 0.3 mm thick diffusion layer and a 0.5 mm thick active layer, but without nickel plating;

[0239] - shielding electrode comprising passages forming a 2.5mm diameter honeycomb Figure 8 The illustrated honeycomb matrix 71 is 0.8 mm thick. This honeycomb base is made of nickel with 0.2 mm thick walls and is topped by a mesh 72 made of 0.2 mm thick nickel sheet with 2 mm diameter openings. The honeycomb base and its top mesh are prepared by laser cutting.

[0240] The shield electrode is fixed to the active layer of the air electrode by some 0.2 mm thick layer of alkali resistant glue 84 such as RTV silicone rubber which also acts as an electrical insulating layer.

Embodiment 3

[0242] in passing Figure 11 , Figure 12 , Figure 13 , Figure 14 with Figure 15 In the illustrated third exemplary embodiment, we utilize:

[0243] - an air electrode prepared as described for Example 2;

[0244] - electroplating a 3 mm square pattern grid of 0.2 mm thick nickel acting as current collector 81 on the air electrode on the gas diffusion side;

[0245] - Honeycomb The honeycomb matrix is ​​prepared by laser cutting and fixed to the active layer of the air electrode by some 0.2mm thick layer of alkali resistant glue 84 such as RTV silicone rubber which also acts as an electrical insulating layer.

[0246] After these layers are assembled, the tabs of the current collectors of the air electrode 81b are permanently connected by welding to the tabs of the electrodes of the gas shield 85b, thus resulting in a composite bifunctional air electrode that can be used with only two wires and is suitable for both cathode and anode usage in metal-air batteries.

[02...

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Abstract

Method of operating a secondary Metal-Air electrochemical cell with a metal anode and an air cathode comprising the steps of (a) at start of a charging session, creating in less than 2 seconds an oxygen gas-shield on the electrolyte side of the air-electrode obstructing ion passage between the bulk of the electrolyte and the air-electrode; (b) charging the cell without anodic polarization of the air-electrode with the help of (i) electric conductive material placed between the electrolyte side of air-electrode and the bulk of electrolyte, and, (ii) the said oxygen gas-shield obstructing passage of ions of the electrolyte between the electrolyte side of air-electrode and the bulk of electrolyte; (c) removing the oxygen gas-shield at start of a discharging session.

Description

field of invention [0001] This patent application relates generally to the field of electrically rechargeable batteries and components thereof. More particularly, it relates to bifunctional air electrodes for secondary metal-air electrochemical cells. Background of the invention [0002] 1. Existing needs [0003] Electrically rechargeable batteries are a strategic component of electric vehicles. The goal is to have high energy density, high power density, be environmentally friendly, cheap and safe battery. At the moment, lead-acid batteries, NiMH and different types of Li-ion batteries are desirable for EV use, but all suffer from at least one disadvantage, primarily cost or safety at high energy densities. [0004] It is well known that metal-air batteries are relatively light-weight power sources. It utilizes oxygen from ambient air or dissolved in water as a reactant in an electrochemical reaction. [0005] A metal-air battery includes a negative metal electrode (e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/8615H01M4/8657H01M4/8875Y02E60/10H01M12/08H01M2004/8689
Inventor 苏伦·马蒂罗斯延迪迪尔·吉尔奈特
Owner AZA HLDG
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