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Positive electrode material for metal-air battery and preparation method for positive electrode

A metal-air battery and cathode material technology, applied in the field of electrochemical energy, can solve the problems of long-term battery storage difficulties, complex manufacturing process, low current density, etc., achieve wide applicability, prolong battery life, and reduce battery overpotential effects

Active Publication Date: 2016-08-10
徐嘉陵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The catalyst in the positive electrode in the metal-air battery plays the role of catalytic reduction of oxygen. The catalyst types used are noble metal catalysts, mainly platinum, gold, silver or their alloys, metal chelates, etc., and its disadvantage is that it is expensive; The disadvantage of metal chelates is that the manufacturing process is complicated, and it is difficult to store the batteries produced for a long time; there is also manganese oxide catalyst, whose disadvantage is that the current density is low, which is not only suitable for mass production, but also has Catalyst with high current density, which is one of the important factors restricting the mass production of metal-air batteries

Method used

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  • Positive electrode material for metal-air battery and preparation method for positive electrode
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  • Positive electrode material for metal-air battery and preparation method for positive electrode

Examples

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Effect test

Embodiment 1

[0034] Embodiment 1: (coating method)

[0035] Positive electrode material formula:

[0036]

[0037] Prepare the positive electrode of embodiment 1 by coating method:

[0038] Add other components other than PTFE floating liquid into 95% ethanol, after the solids are fully wetted, stir evenly, ultrasonically disperse for 45-60min to disperse evenly; then slowly add PTFE emulsion dropwise under stirring state, stir evenly at 1000rpm to form Viscous colloid, press filtration to remove excess liquid, and obtain a mixture with a viscosity suitable for coating; spread the mixture on a nickel mesh with a thickness of 2.5mm, and then place it on a waterproof and breathable membrane with a waterproof grade of IP 68, at 120°C Dry for 9 hours, cool to room temperature, add hydrophilic non-woven fabric and microfiltration membrane, at room temperature at 50Kg / cm 2 Use a flat plate to press for 3-5 minutes under a certain pressure, so that the thickness of the positive electrode is ...

Embodiment 2

[0039] Embodiment 2: (dipping method)

[0040] Positive electrode material formula:

[0041]

[0042] The positive electrode of embodiment 2 is prepared by dip-coating method:

[0043] Add 95% ethanol to other components other than PTFE floating liquid, and stir evenly after the solids are fully wet; then slowly add PTFE emulsion dropwise under stirring, and stir evenly at a speed of 1000rpm to form a viscous slurry to adjust the viscosity to a viscosity suitable for dip coating; dip a nickel mesh with a thickness of 2.5mm into the above slurry, take it out after 10s, and then place it on a waterproof and breathable membrane with a waterproof grade of IP 68, dry it in vacuum at 140°C for 7 hours, add pro- Water non-woven fabric and microfiltration membrane, at room temperature at 80Kg / cm 2 Under a certain pressure, use a flat plate to press for 3-5 minutes until the thickness of the positive electrode sheet is 1.0-1.5mm, and the positive electrode of the battery is obtain...

Embodiment 3

[0044] Embodiment 3: (rolling method)

[0045] Positive electrode material formula:

[0046]

[0047]

[0048] The positive pole of embodiment 3 is prepared by rolling method:

[0049]Add 95% ethanol to other components other than the PTFE floating liquid. After the solids are fully wetted, stir evenly and then add the PTFE emulsion. After stirring at 400rpm to form a ball, roll it into a sheet with a thickness of 0.5-2mm to obtain A battery catalyst layer sheet with a uniform thickness; spread the sheet on a nickel mesh with a thickness of 2.5mm, roll it into 0.8-1.0mm, add a waterproof breathable membrane with a waterproof grade of IP 68, a hydrophilic non-woven fabric and a microfiltration membrane, Roll it to a thickness of 1-1.5 mm, dry at 150°C for 4 hours, and cool to room temperature to obtain the positive electrode of the battery.

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Abstract

The invention discloses a positive electrode material for a metal-air battery and a preparation method for a positive electrode. The positive electrode material comprises the following constituents by weight: 2-6% of M<x>Fe<3-x>O<4>, 0.5-3% of carbon dioxide absorbent, 5-10% of active carbon, 0.5-4% of super-conductive acetylene black, 0.5-2% of expanded graphite, 10-70% of 95% ethyl alcohol and 7-80% of PTFE emulsion, wherein the x in the M<x>Fe<3-x>O<4> is less than 3, and M is one or Fe, Cu, Co and MN. By the positive electrode material, overpotential of the battery can be reduced, the service lifetime of the battery is prolonged, and electrolyte carbonation can be reduced. The positive electrode material disclosed by the invention is wide in applicability and is suitably used for coating, dip-coating and rolling methods. The battery prepared from the positive electrode material has high-power (more than 1W, a single battery) discharge performance and high battery capacity under 1A current discharge (more than 6,000mAh, a single battery).

Description

【Technical field】 [0001] The invention relates to a positive electrode material for a metal-air battery and a preparation method thereof, belonging to the technical field of electrochemical energy. 【Background technique】 [0002] Metal-air batteries use metals (zinc, lithium, aluminum, magnesium, etc.) and oxygen as fuel to convert chemical energy into electrical energy, and have the advantages of non-toxic, non-polluting, stable discharge voltage, high specific energy, long storage life, and low price. , Compared with existing lead-acid, nickel-metal hydride and other batteries, metal-air batteries have higher energy density and specific energy. For this type of battery, the catalyst material and formula used in the positive electrode determine the performance of the entire battery and are also key elements in its mass production application. [0003] The catalyst in the positive electrode in the metal-air battery plays the role of catalytic reduction of oxygen. The cataly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M12/06H01M4/88H01M4/90
CPCH01M4/88H01M4/9016H01M12/06
Inventor 杨展长陈永信王思义袁伟标
Owner 徐嘉陵
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