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A large-capacity lithium-sulfur flow battery and preparation method of its electrode

A lithium-sulfur flow battery, large-capacity technology, applied in battery electrodes, fuel cell additives, regenerative fuel cells, etc. The size of the flow battery should not be too large to achieve the effects of reducing power generation costs, low flow resistance, and improving power generation efficiency

Inactive Publication Date: 2016-03-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Sodium in traditional sodium-sulfur batteries is in the liquid state of metal, so there are major problems: 1. High working temperature; 2. It is not suitable for intermittent work. too big
The all-vanadium redox flow battery has low working voltage and low energy density.
Traditional lithium-ion flow batteries use graphite as the active material, but the lithium intercalation capacity of graphite can only reach 372mAhg -1 , the energy density is also relatively low
The semi-liquid flow lithium-sulfur battery proposed by CN102324550 does not use a collector, but forms a cathode and an anode in a metal box or metal tube, so the reaction area is small, and it is difficult to provide high current and high power output

Method used

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  • A large-capacity lithium-sulfur flow battery and preparation method of its electrode
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Effect test

preparation example Construction

[0029] A preparation method of a high-power lithium-sulfur liquid flow electrode, specifically comprising the following steps:

[0030] Step A: Take the carbon source material and heat it to 100-150°C to a liquid state, then immerse the foamed nickel into the liquid carbon source material, then connect a rheostat box and a power supply in series at both ends of the foamed nickel, and self-heat when the power is turned on. The principle and effect are equivalent to the heating of the electric heating wire, and the rheostat box is used to control the temperature of the nickel foam by controlling the magnitude of the current. When the temperature of the nickel foam reaches the carbonization temperature of the carbon source material, the carbon source material is carbonized on the inner surface of the nickel foam to form a 0.1-1 micron thick carbon coating layer. The carbon source material is a polymer with a molecular weight of less than or equal to 10,000 (polyethylene glycol, p...

Embodiment 1

[0039] Embodiment 1: electric heating carbonization

[0040] Heat polyethylene glycol with a molecular weight of 10,000 to 100°C to melt it, and immerse foam nickel with a porosity of 95% in it. Connect the two ends of the foam nickel to a 220V power supply for heating, and control the current density at 0.1-1Acm -2 , control the temperature of nickel foam at 250-350°C for carbonization to form a carbon coating. In the early stage of carbonization, a higher current density can be used. When the temperature of nickel foam exceeds 350°C, the current density can be reduced to adjust the carbonization temperature to within the range of 250-350°C.

[0041] When the carbon source material is replaced by polyethylene glycol with a molecular weight of 400, since it is liquid at room temperature, it can be carbonized by electricity without heating. Similarly, for C 6 Fatty alcohols such as 2-hexanol C 6 h 13 OH, and fatty acids such as n-hexanoic acid C 5 h 11 COOH is liquid at r...

Embodiment 2

[0042] Example 2: Negative Electrode Preparation

[0043] Heat polyacrylic acid with a molecular weight of 5,000 to 120°C to melt it, and immerse foamed nickel with a porosity of 95% in it. Both ends of the foamed nickel are connected to a 220V power supply for heating, and the current density is controlled at 0.1 to 1Acm -2 , control the temperature of nickel foam at 250-350°C for carbonization to form a carbon coating. In the early stage of carbonization, a higher current density can be used. When the temperature of nickel foam exceeds 350°C, the current density can be reduced to adjust the carbonization temperature to within the range of 250-350°C. When the carbon layer reaches a thickness of 0.1 micron, take it out and place it in a muffle In the furnace under the protection of nitrogen, calcined at 800 ° C for 10 hours to form Ni at the interface between the carbon layer and nickel 3 C, increasing the binding force between the carbon layer and the foamed nickel to obtain...

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Abstract

The invention relates to the field of cells, and aims at providing a high-capacity lithium sulfur flow cell, and a preparation method of an electrode thereof. The preparation method of the electrode of the high-capacity lithium sulfur flow cell comprises the following steps: preparing nickel foam with a carbon coating layer; preparing nickel foam as a cathode of the lithium sulfur flow cell; preparing nickel foam as an anode of the lithium sulfur flow cell. The high-capacity lithium sulfur flow cell comprises an anode plate, an anode, a diaphragm, a cathode, a cathode plate, a positive liquid and a negative liquid which are orderly connected; a flow path is engraved on the anode; the flow path is engraved on the cathode plate. By adopting the high-capacity lithium sulfur flow cell, Al with high specific capacity is taken as a negative activated substance, S is taken as a positive activated substance, carbon-coated nickel foam is taken as the cathode, and nickel sulfide-coated nickel foam is taken as the anode, so that the electrode with high activity, high strength and low flow resistance is supplied to the lithium sulfur flow cell; the energy density and power density of the lithium sulfur flow cell are greatly improved. The activated substances and the electrode material are low in cost, simple and feasible in preparation technology, and wide in application prospect.

Description

Technical field [0001] The present invention relates to the field of batteries, and in particular to a large-capacity lithium-sulfur flow battery and a preparation method of its electrode. Background technique [0002] Sulfur is insoluble in water but soluble in non-polar solvents such as carbon disulfide, carbon tetrachloride, cyclohexane, etc. Crystalline sulfur can form a ring composed of eight atoms: S 8 . S 8 After obtaining electrons, polysulfide ions such as S can be formed 8 2- ,S 6 2- ,S 4 2- , these polysulfide ions can be dissolved in organic solvents such as ethylene carbonate (EC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), dimethoxyethane (DME), 1,3-di Oxopentane (DOL), etc. [0003] Flow battery is a type of energy storage battery, the most representative of which is the all-vanadium flow battery. It is composed of electrolyte solution, carbon material electrodes, bipolar plates and ion exchange membranes. The electrolyte is circulated ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/96H01M4/88
CPCH01M4/86H01M4/88H01M8/04H01M8/18Y02E60/50
Inventor 李洲鹏蔡文龙刘宾虹
Owner ZHEJIANG UNIV