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Electrolyte for magnesium rechargeable battery and preparation method thereof

A technology for recharging and magnesium batteries, applied in the field of electrolytes and preparations for magnesium rechargeable batteries, can solve the problems of low charge/discharge rate, poor electrochemical stability, low ionic conductivity, etc., and achieve good battery life Effects of chemical stability, high discharge capacity, and high ion conductivity

Active Publication Date: 2016-02-10
KOREA INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] However, these electrolytes have poor electrochemical stability in the high potential region and low ionic conductivity, and the battery and the device have low charge / discharge rates at high voltages, limiting their performance

Method used

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  • Electrolyte for magnesium rechargeable battery and preparation method thereof
  • Electrolyte for magnesium rechargeable battery and preparation method thereof
  • Electrolyte for magnesium rechargeable battery and preparation method thereof

Examples

Experimental program
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Embodiment approach

[0052] According to another embodiment, the method further comprises: (c) adding a lithium salt to the first solution after step (a) or to the second solution after step (b) to prepare a third solution.

[0053] In another aspect, the present invention provides a magnesium battery including the electrolyte according to any one of the exemplary embodiments. The magnesium battery of the present invention may be a magnesium rechargeable battery or a magnesium hybrid battery, but is not limited thereto.

[0054] Other embodiments of the invention will be further described. However, the present invention should not be construed as being limited to the following description.

[0055] According to one embodiment of the present invention, magnesium powder is added in the organic solvent metal chloride salt such as AlCl 3 or CrCl 3 solution, which distinguishes the electrolyte of the present invention from conventional Grignard solutions. Magnesium dissolves slowly until equilibriu...

Embodiment 1

[0073] Embodiment 1: Preparation of AlCl 3 -CrCl 3 - Solution of BMPBr-magnesium ion complex-LiCl mixture

[0074] 6.667gAlCl 3 and 0.1584gCrCl 3 was dissolved in 100 mL of THF as solvent to prepare a solution in which AlCl 3 and CrCl 3 Present at concentrations of 0.5M and 0.01M, respectively. To this solution was added 3 g of magnesium powder. The mixture was kept for 24 hours to allow the AlCl 3 , CrCl 3 , metal magnesium and magnesium ions reach equilibrium, and then 0.2 g of BMPBr is dissolved in it as an ionic liquid to form a complex with magnesium ions. Finally, 2.120 g LiCl was dissolved in 100 mL of the solution containing the magnesium ion complex. The resulting solution was prepared by 0.5MAlCl 3 , 0.01MCrCl 3 , 0.2% BMPBr, magnesium ion complex and 0.5MLiCl. After removing the solid fraction from the solution, the remaining liquid fraction was collected and used as electrolyte.

Embodiment 2

[0075] Embodiment 2: Preparation of AlCl 3 -CrCl 3 -AMPCl-magnesium ion complex-LiCl mixture solution

[0076] An electrolyte was prepared in the same manner as in Example 1 except that AMPCl was used as the ionic liquid instead of BMPBr.

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Abstract

Disclosed is an electrolyte solution for a magnesium rechargeable battery with a high ionic conductivity and a wide electrochemical window compared to the conventional electrolyte solution. The electrolyte solution is prepared by dissolving magnesium metal into the ethereal solution using combinations of metal chloride catalysts. The electrolyte solution can be applied to fabricate magnesium rechargeable batteries and magnesium hybrid batteries with a markedly increased reversible capacity, rate capability, and cycle life compared to those batteries employing the conventional electrolyte solution. Also disclosed is a method for preparing the electrolyte.

Description

[0001] Cross References to Related Applications [0002] This application claims priority under Korean Patent Application No. 10-2014-0094856 filed on July 25, 2014 in the Korean Intellectual Property Office under 35 USC Section 119, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to an electrolytic solution for a magnesium rechargeable battery, which is electrochemically stable in a high voltage region and has improved ion conductivity, and a method for preparing the same. Background technique [0004] It is well known that conventional lithium batteries employing lithium metal suffer from numerous parasitic reactions of the electrolyte system on reactive lithium anodes, which pose several critical issues in terms of their safety. Furthermore, since lithium is relatively rare as a natural resource, it is called a noble element. In particular, with the recent increasing demand for medium-sca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/0567H01M10/054H01M12/00
CPCH01M10/054H01M10/0567H01M10/0568H01M12/00H01M2300/0025H01M10/0569Y02E60/10
Inventor 吴是衡赵炳源郑暻胤李重基张元英赵宰显河正勋
Owner KOREA INST OF SCI & TECH
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