Silver nanowire positive electrode for zinc-silver battery and preparation method thereof

A silver nanowire, zinc-silver battery technology, applied in battery electrodes, silver storage batteries, alkaline storage battery electrodes, etc., can solve the problem of high resistance of micron-sized silver powder positive electrode, small contact surface between granular silver powder and current collector, poor structural integrity, etc. To achieve the effect of improving specific energy and rapid discharge performance, improving specific energy and rapid discharge performance, and reducing polarization current density

Active Publication Date: 2020-07-10
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (2) The positive electrode of micron-sized silver powder is thick and the specific surface area is small, so it is difficult to improve the specific energy and rapid discharge performance of the battery
[0006] (3) The volume resistance of the positive electrode of micron-sized silver powder is large, and the battery is prone to overheating during charging and discharging, especially during rapid discharging
Micron-sized silver powder is molded and sintered at a temperature lower than the melting point. The physical contact between silver powders is still dominant, the contact resistance is large, and the contact surface between the granular silver powder and the current collector is small, and a good conductive network cannot be formed. The surface layer of the silver powder after charging is Silver oxide with poorer conductivity further increases the volume resistance of the electrode, and the battery is prone to overheating during rapid discharge, which affects its performance
[0007] (4) Micron-sized silver powder electrodes have very low strength and poor structural integrity
Silver powder is mainly in physical contact, and there is a phenomenon of powder falling, which not only increases the difficulty of battery assembly, but also makes it difficult to guarantee the stability of battery performance.

Method used

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  • Silver nanowire positive electrode for zinc-silver battery and preparation method thereof
  • Silver nanowire positive electrode for zinc-silver battery and preparation method thereof
  • Silver nanowire positive electrode for zinc-silver battery and preparation method thereof

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preparation example Construction

[0038] A method for preparing a positive electrode of silver nanowires for a zinc-silver battery of the present invention comprises the following steps: laying pretreated silver nanowires on the upper and lower sides of the current collector, and obtaining silver nanowires after compression molding and vacuum sintering positive electrode.

[0039] The invention adopts the silver nanowire to prepare the silver nanowire positive electrode, and the extremely small diameter of the silver nanowire is beneficial to improving the specific energy of the battery. When charging, the silver nanowires with extremely small diameters are converted into silver oxide, and their thickness is much smaller than that generated by micron-sized silver powder, so the O -2 The hindrance of ion and electron migration is limited, the oxidation reaction of the silver nanowire core is sufficient, and the conversion rate of silver oxide is improved. Vacuum sintering realizes the welding between silver nan...

Embodiment 1

[0041] A method for preparing a silver nanowire positive electrode for a zinc-silver battery in this embodiment comprises the following steps:

[0042] 1. Pretreatment of silver nanowires: Prepare silver nanowires by conventional alcohol-thermal method, separate and purify the obtained silver nanowires, dilute the reaction solution containing silver nanowires by 2 times with ethanol, press filter under 1Mpa pressure, After the solid-liquid separation is complete, take out the precipitate, disperse the precipitate in ethanol, press filter under 1Mpa pressure, after solid-liquid separation, take out the precipitate, then repeat the dispersion-press filter for 3 times until the ethylene glycol (EG) and The total content of impurities such as polyvinylpyrrolidone (PVP) is ≤0.5%, and the separated and purified silver nanowires are obtained. The prepared silver nanowires are as follows: figure 1 As shown, the diameter is 100 nm and the length is 25 μm.

[0043] 2. Compression molding...

Embodiment 2

[0049] A method for preparing a silver nanowire positive electrode for a zinc-silver battery in this embodiment comprises the following steps:

[0050] 1. Pretreatment of silver nanowires: Prepare silver nanowires by conventional alcohol-thermal method, separate and purify the obtained silver nanowires, dilute the reaction solution containing silver nanowires by 4 times with alcohol, and centrifuge at 1500rad / min 5min, pour out the supernatant, take out the precipitate, disperse the sediment in alcohol, centrifuge at a speed of 1500rad / min for 5min, take out the precipitate after solid-liquid separation, and then repeat the dispersion-centrifugation of the precipitate 4 times until ethylene glycol ( EG) and polyvinylpyrrolidone (PVP) and other impurities with a total content of ≤0.5%) to obtain separated and purified silver nanowires, the prepared silver nanowires have a diameter of 100nm and a length of 25μm.

[0051] 2. Compression molding: Then weigh 0.5g of pretreated silv...

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Abstract

Disclosed are a silver nanowire positive electrode for a silver zinc battery and a method for preparing the same. The method comprises the following steps: laying pre-processed silver nanowires above and below a current collector; and performing compression molding and vacuum sintering and obtaining a silver nanowire positive electrode. The silver nanowire positive electrode obtained in the present invention has advantages of a large specific surface area, reduced thickness, low volume resistance, and a stable structure.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a silver nanowire positive electrode for a zinc-silver battery and a preparation method thereof. Background technique [0002] Zinc-silver batteries use silver oxide as the positive electrode, zinc as the negative electrode, and potassium hydroxide aqueous solution as the chemical power source of the electrolyte. They have the characteristics of high specific energy, high specific power, high safety, and high voltage stability. They are widely used in water Under Equipment and Aerospace. With the demand for equipment performance improvement, such as improving equipment endurance, increasing equipment payload weight and space, reducing self-weight to improve equipment mobility, improving equipment navigation speed and rapid response capabilities, etc., zinc-silver batteries are required to further increase specific energy and capacity. Fast discharge performance. The key to im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/28H01M4/30H01M4/24H01M10/32
CPCH01M4/244H01M4/28H01M4/30H01M10/32Y02E60/10
Inventor 王震堵永国郑春满余翠娟
Owner NAT UNIV OF DEFENSE TECH
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