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Lithium oxygen battery electrolyte using molybdenum pentachloride as redox medium and preparation and application thereof

A lithium-oxygen battery and molybdenum pentachloride technology, applied in the field of electrochemical catalysis, can solve the problems of unstable and easy decomposition of organic compounds, unsatisfactory catalytic performance of catalysts, and battery performance decline, so as to stabilize the battery system and reduce charging Voltage, the effect of improving the cycle life

Active Publication Date: 2019-01-11
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalytic performance of these catalysts is not satisfactory
Later, it was proposed to apply organic redox mediators (Nat Chem 2013, 5, 489-494.) to lithium-oxygen battery systems. However, organic compounds are unstable and easy to decompose, which will lead to battery performance degradation

Method used

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  • Lithium oxygen battery electrolyte using molybdenum pentachloride as redox medium and preparation and application thereof
  • Lithium oxygen battery electrolyte using molybdenum pentachloride as redox medium and preparation and application thereof
  • Lithium oxygen battery electrolyte using molybdenum pentachloride as redox medium and preparation and application thereof

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Embodiment 1

[0025] Dry molybdenum pentachloride in a vacuum desiccator at 120°C for 24 hours, then dissolve molybdenum pentachloride in tetraethylene glycol with a lithium bistrifluoromethylsulfonimide concentration of 1 mol / L in a glove box In the electrolytic solution of dimethyl ether, the electrolytic solution using molybdenum pentachloride as redox medium can be obtained in the present invention, wherein the concentration of molybdenum pentachloride is 0.05 mol / L.

Embodiment 2

[0027] Molybdenum pentachloride was dried in a vacuum desiccator at 120 °C for 24 hours, and then the electrolysis of molybdenum pentachloride dissolved in lithium trifluoromethanesulfonate with a concentration of 1 mol / L ethylene glycol dimethyl ether in a glove box In the liquid, the electrolytic solution using molybdenum pentachloride as redox medium can be obtained in the present invention, wherein the concentration of molybdenum pentachloride is 0.05 mol / L.

Embodiment 3

[0029] Molybdenum pentachloride was dried in a vacuum desiccator at 120°C for 24 hours, and then molybdenum pentachloride was dissolved in an electrolyte solution of tetraethylene glycol dimethyl ether with a lithium trifluoroacetate concentration of 0.5 mol / L in a glove box In the present invention, the electrolytic solution using molybdenum pentachloride as a redox medium can be obtained, wherein the concentration of molybdenum pentachloride is 0.05 mol / L.

[0030] figure 1 The charge-discharge curves of lithium-oxygen batteries added molybdenum pentachloride at a current density of 400 mA / g. It can be seen from the figure that the lithium-oxygen battery containing the redox medium of molybdenum pentachloride can discharge up to 27951 mA h / g in the first week, the charging voltage can be reduced to 4.0 V, and the capacity can still reach 15731 mA h in the second cycle / g, and the Faradaic efficiency reaches over 80%, showing good reversibility.

[0031] figure 2 It is th...

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Abstract

The invention relates to a lithium-oxygen battery electrolyte using molybdenum pentachloride as redox medium and preparation and application thereof. The electrolyte includes soluble lithium salt as solute, proton-free solvent and additive molybdenum pentachloride. The concentration of solute in the electrolyte is 0.1- 1 mol / L. The concentration of molybdenum pentachloride in electrolyte is 0.01-0.1 mol / L. As that molybdenum pentachloride is use as an electrolyte additive in the lithium oxygen battery, the invention facilitates the formation of the cyclic lithium peroxide dure the discharge process, and also plays the role of stabilizing the carbon electrode. Lithium peroxide discharge products can be effectively decomposed in the charging process, and the cycle life and reversibility ofthe battery can be improved by decreasing the charging voltage. At the same time molybdenum pentachloride is stable in the battery system and no side reaction occurs. The invention has the advantagesof low cost, easy access, high efficiency and convenience.

Description

technical field [0001] The invention relates to a lithium-oxygen battery electrolyte with molybdenum pentachloride as an oxidation-reduction medium and its preparation and application, belonging to the technical field of electrochemical catalysis. Background technique [0002] Lithium-oxygen batteries have super high specific energy due to the direct use of oxygen as the active material. Not only that, but also have the advantages of stable discharge and high discharge platform, and are considered to be the most promising secondary energy system. [0003] However, there are still many problems in the lithium-oxygen battery system that need to be solved urgently. For example, during the discharge process, the superoxide intermediate produced is extremely unstable. Superoxide ions will attack carbon-based materials or organic electrolytes to generate by-products. , the discharge product lithium peroxide is an insulator, which will lead to an increase in the charging overpotent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M12/08
CPCH01M10/0567H01M10/0568H01M10/0569H01M12/08Y02E60/10
Inventor 周震王新改谢召军魏进平
Owner NANKAI UNIV
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