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Array type positive electrode current collector for liquid metal battery

A liquid metal battery and cathode current collector technology, applied in the field of electrochemistry, can solve the problems of reducing the internal stress and instability of the interface alloy layer, and achieve the effect of reducing the internal resistance of the battery, improving the electrical conductivity, and ensuring safe and efficient operation.

Active Publication Date: 2020-03-17
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide an array type positive electrode current collector for the above-mentioned problems such as instability in the positive interface amplification process of the existing liquid metal battery, through A number of columnar arrays pointing to the direction of the negative electrode are set at the bottom of the positive electrode current collector case, which can effectively improve the distribution uniformity of the positive electrode interface of the liquid metal battery, reduce the internal stress of the interface alloy layer and provide more attachment sites for the alloy layer, and effectively eliminate large-size batteries. Short circuit risk during operation, and effectively ensure the mass transfer process of the battery charge and discharge process, and promote the safe and stable operation of the battery

Method used

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  • Array type positive electrode current collector for liquid metal battery

Examples

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Effect test

Embodiment 1

[0032] An array type positive current collector for liquid metal batteries, which includes a graphite conductive shell and a columnar array arranged on the bottom surface of the conductive shell, wherein the columnar array is composed of 8 graphite cylindrical repeating units with the vertical bottom facing upward, the array Arranged in a triangle, each cylindrical repeating unit has a diameter of 1.5mm and a height of 55mm.

[0033] The current collector is used for the positive electrode of Sn 6 Sb 4 In a Li-Sn-Sb liquid metal battery whose alloy, electrolyte is LiF-LiCl-LiBr ternary mixed salt, and the operating temperature is 500°C, the design capacity of the battery is 300Ah, and the interface area of ​​the positive electrode is 300cm 2 , the graphite columnar array is 9mm higher than the liquid level of the positive liquid metal and lower than the lower liquid level of the negative liquid metal, separating the raised positive liquid metal interface into several areas wi...

Embodiment 2

[0039] An array type positive current collector for liquid metal batteries, which includes a 304 steel conductive shell and a columnar array arranged on the bottom of the conductive shell, wherein the columnar array consists of 15 304 steel cylindrical repeating units with the vertical bottom facing upward , the array is arranged in concentric circles, and each cylindrical repeating unit has a diameter of 1.6mm and a height of 55mm.

[0040] The current collector is used for the positive electrode of Sn 6 Sb 4 In a Li-Sn-Sb liquid metal battery whose alloy, electrolyte is LiF-LiCl-LiBr ternary mixed salt, and the operating temperature is 500°C, the design capacity of the battery is 300Ah, and the interface area of ​​the positive electrode is 300cm 2, The 304 steel columnar array is 8mm higher than the liquid level of the positive liquid metal and lower than the lower liquid level of the negative liquid metal, separating the raised positive liquid metal interface into several ...

Embodiment 3

[0046] An array type positive current collector for liquid metal batteries, which includes a 316 steel conductive shell and a columnar array arranged on the bottom of the conductive shell, wherein the columnar array consists of 10 316 steel cylindrical repeating units with the vertical bottom facing upward , the array is arranged in concentric circles, and each cylindrical repeating unit has a diameter of 1.2mm and a height of 53mm.

[0047] The current collector is used for the positive electrode of Sn 6 Sb 4 In a Li-Sn-Sb liquid metal battery whose alloy, electrolyte is LiF-LiCl-LiBr ternary mixed salt, and the operating temperature is 500°C, the design capacity of the battery is 300Ah, and the interface area of ​​the positive electrode is 300cm 2 , The columnar array of 316 steel is 5mm higher than the liquid level of the positive liquid metal and lower than the lower liquid level of the negative liquid metal, separating the raised positive liquid metal interface into seve...

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Abstract

The invention discloses an array type positive electrode current collector for a liquid metal battery. By arranging a columnar array pointing to the direction of a negative electrode at the bottom ofa positive electrode current collector shell, the distribution uniformity of the positive electrode interface of the liquid metal battery is effectively improved, the internal stress of an interface alloy layer is reduced, more attachment sites are provided for the alloy layer, and the short-circuit risk in the operation process of a large-size battery is effectively eliminated, at the same time,the mass transfer process of the battery charging and discharging process can be effectively ensured, and the safe, stable and efficient battery operation is promoted.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to an array positive current collector for a liquid metal battery. Background technique [0002] Liquid metal battery is a high-temperature secondary battery for distributed grid energy storage proposed by Professor Sadoway of MIT in 2009. Due to its advantages such as ultra-long cycle life, excellent rate performance, high Coulombic efficiency and energy efficiency, it has attracted extensive attention from the scientific research community in recent years, and it is expected to become a new generation of high-efficiency distributed grid energy storage technology. [0003] However, the battery cell faces certain technical challenges in the process of engineering scale-up. The main reasons for the difficulty in scaling up the battery cell are as follows: [0004] 1) The uneven distribution and growth of the solid alloy layer at the positive electrode interface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/70H01M10/39
CPCH01M4/70H01M4/663H01M4/661H01M4/669H01M10/39Y02E60/10
Inventor 汪的华李闻淼杜开发刘威
Owner WUHAN UNIV
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