Liquid metal battery positive electrode current collector with metal carbide coating with concave-convex surface microstructure

A technology for liquid metal batteries and positive current collectors, applied in battery electrodes, active material electrodes, electrode carriers/collectors, etc., can solve problems such as unfavorable technology popularization and application, loss of graphite lining, wear of graphite lining, etc., to achieve Improve electrical conductivity and liquid metal wear resistance, ensure stability and safety performance, and improve wear and corrosion resistance

Active Publication Date: 2020-03-24
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the use of graphite lining has the following disadvantages: 1) the introduction of graphite lining can easily cause the liquid metal positive electrode to bulge under the action of surface tension, making the battery prone to short circuit; During the long-term use process, the violent fluctuation of the liquid metal at high temperature is easy to wear the graphite lining, resulting in the loss of the graphite lining; 3) The preparation requirements involved in the spectrally pure graphite lining And the preparation cost is high, which is not conducive to the popularization and application of technology, and the weight of the whole battery increases due to the spectrally pure graphite added between the stainless steel shell and the liquid metal, thereby reducing the energy density of the battery

Method used

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  • Liquid metal battery positive electrode current collector with metal carbide coating with concave-convex surface microstructure
  • Liquid metal battery positive electrode current collector with metal carbide coating with concave-convex surface microstructure
  • Liquid metal battery positive electrode current collector with metal carbide coating with concave-convex surface microstructure

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Effect test

Embodiment 1

[0039] A liquid metal battery cathode current collector with a concave-convex surface microstructure carbide coating, the preparation method of which comprises the following steps:

[0040] 1) Using NaF-KF-Na 2 CO 3 -Li 2 MoO 4 Molten electrolyte: weigh a total of 500g of NaF-KF with a molar ratio of 2:3, and add 15g of NaF 2 CO 3 and 25g Li 2 MoO 4 , put it in an alumina crucible, put it in a 300°C drying oven for 48 hours to remove the moisture, take it out and put it in a high-temperature resistance furnace, and heat it up to 780°C at a rate of 3°C / min for 2 hours under the protection of an argon atmosphere. molten electrolyte;

[0041]2) Using SS304 as the cathode and molybdenum sheet as the anode, under the condition of molten electrolyte, electrolyze with a 2.5V cell voltage for 3 hours. After the electrolysis, lift the electrode out until it cools down, and then wash it with water to obtain a microstructure with spherical protrusions. Molybdenum carbide-coated l...

Embodiment 2

[0045] A liquid metal battery cathode current collector with a concave-convex surface microstructure carbide coating, the preparation method of which comprises the following steps:

[0046] 1) Using NaCl-KCl-Li 2 CO 3 -Na 2 WO 4 Molten electrolyte: weigh a total of 500g of NaCl-KCl with a molar ratio of 1:1, and add 15g of Li 2 CO 3 and 25g Na 2 WO 4 , put it in an alumina crucible, put it in a 200°C drying oven for 24 hours to remove the moisture, take it out and put it in a high-temperature resistance furnace, and heat it up to 850°C at a rate of 4°C / min for 2 hours under the protection of an argon atmosphere. molten electrolyte;

[0047] 2) Using SS430 as the cathode and tungsten sheet as the anode, under the condition of molten electrolyte, electrolyze with a 2.0V cell voltage for 2 hours. After the electrolysis, lift the electrode out until it cools down, and then wash it with water to obtain a microstructure with spherical protrusions. Tungsten carbide coated liq...

Embodiment 3

[0051] A liquid metal battery cathode current collector with a concave-convex surface microstructure carbide coating, the preparation method of which comprises the following steps:

[0052] 1) Using NaF-KF-LiF-Li 2 CO 3 -K 2 CrO 4 Molten electrolyte: weigh a total of 500g of NaF-KF-LiF with a mass ratio of 30:60:10, and add 15g of Li 2 CO 3 and 25g K 2 CrO 4 , mixed well, put it in an alumina crucible, put it in a 250°C drying oven for 24 hours to remove the moisture, take it out and put it in a high-temperature resistance furnace, and under the protection of an argon atmosphere, heat it up to 950°C at a rate of 4°C / min and keep it for 2h. molten electrolyte;

[0053] 2) With SS430 as the cathode and Cr sheet as the anode, under the condition of molten electrolyte, 150mA cm -2 The current density of the electrolysis is 3h. After the electrolysis is over, the electrode is taken out until it is cooled, and then washed with water to obtain a liquid metal battery positive ...

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Abstract

The invention discloses a liquid metal battery positive electrode current collector with a metal carbide coating with a concave-convex surface microstructure. The metal carbide coating with special surface morphology is additionally arranged on the conductive substrate, so that the contact stability with liquid metal, the liquid metal corrosion resistance and the wear resistance are effectively improved on the basis of ensuring the good conductivity of the current collector, and the related preparation method is simple and relatively low in cost, and has a wide industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of liquid metal batteries, and in particular relates to a positive current collector of a liquid metal battery with a concave-convex surface microstructure carbide coating. Background technique [0002] In recent years, in order to meet the requirements of large-scale energy storage in the power grid, Sodoway et al. proposed the concept of "liquid metal energy storage battery". The positive electrode material uses molten salt as the electrolyte, and self-assembles into a battery with a three-layer structure including the negative electrode, the electrolyte, and the positive electrode under the action of gravity. The battery has the advantages of high power density, high energy density, low energy storage cost, and long life, and has broad application prospects in the field of small and medium-sized distributed energy storage. [0003] Due to the high working temperature of the liquid metal battery (300-700°...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/78H01M4/04
CPCH01M4/667H01M4/78H01M4/044H01M2004/028Y02E60/10
Inventor 汪的华刘威杜开发李闻淼
Owner WUHAN UNIV
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