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Corrosion-resistant liquid metal battery positive electrode current collector

A liquid metal battery, positive current collector technology, applied in battery electrodes, electrode carriers/current collectors, secondary batteries, etc., can solve the problems of low hardness of graphite lining, corrosion, liquid metal entering stainless steel current collectors and shells, etc. , to avoid the consumption of refractory metal on the surface, ensure corrosion resistance and service life, and avoid the problem of battery short circuit

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

AI Technical Summary

Problems solved by technology

[0004] Currently used stainless steel current collectors, the Ni and Fe elements in the composition are easy to react with liquid metal and dissolve preferentially, resulting in serious corrosion problems and affecting battery life
In view of the above technical problems, the corrosion of the positive electrode current collector can be effectively avoided by adding a high-purity graphite lining inside the current collector; however, during the working process, the increased graphite lining can easily cause the liquid metal to easily form bulges, which are in contact with the current collector. The contact of the negative electrode causes a short circuit of the battery; in addition, the graphite lining used is low in hardness and is easily broken, which may easily cause liquid metal and molten salt electrolyte to enter the stainless steel current collector and shell through cracks, thereby further causing corrosion and other problems; and graphite The lining usually needs to be prepared with spectrally pure graphite, which involves complex preparation processes and high costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A corrosion-resistant liquid metal battery cathode current collector, based on low-carbon steel, first prepared a layer of Mo on the surface of 304 stainless steel by thermal spraying 2 C transition layer, and then use the arc spraying process on the prepared Mo 2 Metal Mo layer is prepared on the surface of C to obtain low carbon steel / Mo 2 Corrosion-resistant liquid metal battery cathode current collector with C / Mo structure; among them, Mo 2 The thickness of the C transition layer is 5 μm, and the Mo coating is 30 μm, and the coating bonding force is 81N.

[0027] The obtained low carbon steel / Mo 2 The C / Mo current collector is applied to a liquid metal battery with a capacity of 200Ah using liquid metal Bi as the positive electrode material at 500°C, and the contact resistance between the current collector and the metal is 110mΩcm 2 , at 200mA cm -2 The current density charge-discharge cycle is 300 times, the battery does not appear short circuit phenomenon, the...

Embodiment 2

[0029] A corrosion-resistant liquid metal battery cathode current collector, with 430 stainless steel as the base, firstly prepares a layer of WC transition layer on the surface of 430 stainless steel by physical vapor deposition, and then prepares a metal W layer on the surface of the prepared WC layer by electroplating to obtain SS430 / WC / W structure corrosion-resistant liquid metal battery cathode current collector; among them, the thickness of the WC transition layer is 5 μm, the thickness of the W layer is 45 μm, and the coating adhesion is 63N.

[0030] The obtained SS430 / WC / W current collector is used in a liquid metal battery with a capacity of 200Ah using liquid metal Pb-Sb as the positive electrode material at 500°C, and the contact resistance between the current collector and the metal is 91mΩcm 2 , at 250mA cm -2 The current density charge-discharge cycle is 500 times, the battery does not appear short circuit phenomenon, the thickness loss of the positive electrode...

Embodiment 3

[0032] A corrosion-resistant liquid metal battery cathode current collector, with 304 stainless steel as the base, deposits a CrN transition layer on the surface of 304 stainless steel by physical vapor deposition, and then deposits a layer of Cr by electroplating to obtain a SS410 / CrN / Cr structure Liquid metal battery positive current collector; wherein, the thickness of the CrN transition layer is 5 μm, the total thickness of the Cr coating on the surface of the current collector is about 51 μm, and the coating bonding force is 75N.

[0033] The obtained SS410 / CrN / Cr current collector is used in a liquid metal battery with a capacity of 200Ah using liquid metal Sn-Sb as the positive electrode material at 500°C, and the contact resistance between the current collector and the metal is 73mΩcm 2 , at 350mA cm -2 The current density charge-discharge cycle is 350 times, the battery does not appear short circuit phenomenon, the thickness loss of the positive electrode current coll...

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Abstract

The invention discloses a corrosion-resistant liquid metal battery positive electrode current collector, which comprises a conductive substrate, and a middle transition layer and a metal protection layer which are sequentially arranged on the surface of the conductive substrate. The current collector has the advantages of good conductivity, strong liquid metal corrosion resistance, good contact wettability with liquid metal, good combinability with a conductive substrate and the like, the loss of a positive electrode current collector in a liquid metal battery can be effectively reduced, the safety of the liquid metal battery is remarkably improved, and the service life of the liquid metal battery is remarkably prolonged, and the related preparation method is simple, low in cost and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of energy storage batteries, and in particular relates to a positive current collector of a corrosion-resistant liquid metal battery. Background technique [0002] Liquid metal battery has high energy density, high power density, low energy storage cost and long service life, and it is a potential small and medium-sized distributed energy storage device. However, the currently used stainless steel current collectors are severely corroded in liquid metals, which limits the industrial application of liquid metal batteries. [0003] Generally speaking, the current collector of a liquid metal battery needs to meet at least the following requirements: 1) The current collector must have good thermal and chemical stability to avoid the reaction between the elements in the current collector and the active material of the liquid metal, causing the current collector to 2) The current collector needs to have excellent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/39
CPCH01M4/667H01M4/661H01M10/399Y02E60/10
Inventor 汪的华刘威杜开发李闻淼
Owner WUHAN UNIV
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