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A lithium polythiocyanate catholyte and its semi-liquid flow lithium-sulfur battery

A lithium polythiocyanate and catholyte technology, which is applied in the direction of lithium batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of difficulty in providing high current and high power output, capacity decline of lithium-sulfur batteries, small reaction area, etc. problems, to achieve the effects of large-scale production, good charge-discharge cycle stability, and high reactivity

Inactive Publication Date: 2017-03-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the biggest problem of lithium-sulfur batteries is that lithium polysulfide dissolved in the electrolyte is formed during charging and discharging, and the dissolved lithium polysulfide reacts with lithium metal in the negative electrode, causing capacity loss, which leads to a rapid decline in the capacity of lithium-sulfur batteries, showing extreme poor cycle life
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 lithium polythiocyanate catholyte and its semi-liquid flow lithium-sulfur battery
  • A lithium polythiocyanate catholyte and its semi-liquid flow lithium-sulfur battery

Examples

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preparation example Construction

[0039] A preparation method for a semi-liquid flow lithium-sulfur battery, specifically comprising the following steps:

[0040] Step A: Positive Electrode Preparation

[0041] (1) Copper sulfate is dissolved in water and is mixed with concentration and is the copper sulfate solution of 0.5~3wt%; Get 20 milliliters of copper sulfate solutions and import petri dish, be the foamed nickel sheet (length, width and thickness: 30×20 ×1mm) after the solid is immersed in the copper sulfate solution, the temperature is raised to 40-80°C, and the displacement reaction is carried out for 1-2 hours; due to the dissolution of Ni, the color of the solution changes from blue before the reaction to green, and then cooled to room temperature;

[0042] (2) Sodium borohydride is dissolved in the sodium hydroxide solution that concentration is 5wt%, is mixed with sodium borohydride concentration and is the alkaline sodium borohydride solution of 5wt%; Get 15 milliliters of alkaline sodium borohyd...

Embodiment 1

[0059] Embodiment one: preparation of anhydrous lithium thiocyanate

[0060] Equimolar elemental sulfur and lithium cyanide were co-melted at 140°C to obtain anhydrous lithium thiocyanate.

Embodiment 2

[0061] Example 2: Negative Electrode Preparation

[0062] Under the protection of argon atmosphere, at 10Kg / cm 2 Press the metal lithium sheet onto the copper film under a certain pressure to form a negative electrode base material with a length, width, and thickness of 30×20×1mm; place the negative electrode base material at 25°C in an atmosphere of high-purity nitrogen (purity 99.999%) for 1 hour A negative electrode protected by a lithium nitride layer is obtained.

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Abstract

The invention relates to the field of batteries, and aiming at providing lithium poly thiocyanate cathode liquor and a semi-liquid-flow lithium-sulfur battery thereof. A negative plate is arranged at the outer side of a negative electrode of the battery; a positive plate is arranged at the outer side of a positive electrode of the battery; a flow path is engraved on the positive plate; the flow path is filled with the lithium poly thiocyanate cathode liquor; the two ends of the flow path are provided with a cathode liquor induction pipe and a cathode liquor eduction pipe respectively; a membrane is an Li<+> type perfluorinated sulfonic acid resin membrane; the metal lithium surface of the negative electrode is provided with a lithium nitride protective layer. Compared with the prior art, the lithium poly thiocyanate cathode liquor and the semi-liquid-flow lithium-sulfur battery thereof have excellent charge and discharge cycling stability and high-rate charge and discharge performances; the energy density and the power density of a lithium-sulfur liquid-flow battery are greatly improved; the lithium poly thiocyanate cathode liquor and the semi-liquid-flow lithium-sulfur battery thereof can be widely used for a large-sized astable electricity-generation power station, play a role in electric power regulation, can be also applied to a stable electricity-generation power station; peak electricity and valley electricity of electricity utilization are balanced; the electricity generation efficiency is improved; the electricity generation cost is reduced. An electrode is low in material cost; the preparation process is simple and is easy to implement; the large-scale production is facilitated; the cost of a liquid-flow battery can be effectively reduced.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a catholyte for a large-capacity semi-liquid flow lithium-sulfur battery and the semi-liquid flow lithium-sulfur battery. 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 consisting of eight atoms: S 8 . S 8 Gaining electrons can form polysulfide ions such as S 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 Oxolane (DOL), tetrahydrofuran (THF), etc. [0003] The charge and discharge reactions of sulfur electrodes in traditional lithium-sulfur batteries are complex, and the discharge process mainly includes two steps, corresponding to two discharge platforms: (1) corresponding to S ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/056H01M10/052
CPCH01M10/052H01M10/056Y02E60/10
Inventor 李洲鹏尚振明刘宾虹
Owner ZHEJIANG UNIV