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Magnesium battery electrolyte, preparation method of magnesium battery electrolyte, and magnesium battery

A magnesium battery and electrolyte technology, applied in the energy field, can solve the problems of poor stability, magnesium-aluminum co-deposition, expensive boron salt, etc., and achieve the effect of strong performance and improved battery performance.

Active Publication Date: 2019-09-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, when using an aluminum-based magnesium-sulfur battery electrolyte, due to the close electrochemical reduction potentials of metal magnesium and metal aluminum, magnesium-aluminum co-deposition occurs, which affects the coulombic efficiency in the process of magnesium deposition and dissolution.
However, in the boron-based magnesium-sulfur battery electrolyte, the boron salt used is expensive, has poor stability, and the synthesis process is complicated. For now, aluminum-based and boron-based magnesium-sulfur battery electrolytes are difficult to meet the requirements of future commercialization.

Method used

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  • Magnesium battery electrolyte, preparation method of magnesium battery electrolyte, and magnesium battery
  • Magnesium battery electrolyte, preparation method of magnesium battery electrolyte, and magnesium battery
  • Magnesium battery electrolyte, preparation method of magnesium battery electrolyte, and magnesium battery

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preparation example Construction

[0048] see figure 1 , the embodiment of the present invention also provides a preparation method of the magnesium battery electrolyte, comprising:

[0049] S100, mixing anhydrous magnesium salt, anhydrous lithium salt and the non-aqueous solvent to obtain a mixture; and

[0050] S200, reacting the mixture at 25°C to 200°C;

[0051] Wherein, the anhydrous magnesium salt is Mg(HDMS) 2 , the anhydrous lithium salt is LiY and / or LiX.

[0052] Lithium salts are generally considered as ordinary salts, which do not have acidity or alkalinity. After a lot of experiments, the present invention creatively uses organic magnesium salts as Lewis bases and inorganic lithium salts as Lewis acids to prepare the magnesium battery electrolyte, the Lewis acids can absorb electrons, the Lewis bases donate electrons, and the Lewis acids and the Lewis base under the action of a complexing agent to obtain a coordinated anion and a coordinated cation respectively, thereby forming a stable electro...

Embodiment

[0061] Preparation of magnesium battery electrolyte: (the red part below is modified according to the actual experiment)

[0062] 1035.12 mg of anhydrous Mg(HMDS) 2 and 254.34mg of anhydrous lithium chloride (LiCl) (anhydrous Mg (HMDS) 2 and anhydrous lithium chloride at a molar ratio of 1:2) were mixed in 10 mL of tetrahydrofuran (THF), and reacted at 25° C. for 24 h to obtain a magnesium battery electrolyte. The electrolyte was subjected to nuclear magnetic analysis and Raman spectral analysis.

[0063] see figure 2 and image 3 As shown, the NMR analysis results show that after adding Mg(HMDS) 2 After that, the coordination environment of LiCl changed significantly, that is, the anhydrous MgCl 2 A chemical reaction with anhydrous LiCl occurred in THF, and the chemical shift shifted by 0.3ppm, proving that [HMDSLiCl] － generation. The results of Raman spectroscopy analysis show that at 242cm -1 [Mg 2 Cl 3 ] + characteristic peaks. Combined with NMR and Raman dat...

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Abstract

The invention discloses a magnesium battery electrolyte. The magnesium battery electrolyte comprises a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent. A chemical formula of the electrolyte salt is [Mg2X3Mp][HDMSLiYNq], wherein X is selected from one or more of a minus monovalent halogen ion and a halogen-like ion; Y is selected from one or more of the minus monovalent halogen ion and the halogen-like ion; M and N are the same or different coordination agents; p is selected from any integer from 1 to 6; and q is selected from any integer from 1 to 6. The invention further discloses a preparation method of the magnesium battery electrolyte. The preparation method comprises the following steps: mixing an anhydrous magnesium salt, an anhydrous lithium salt and the non-aqueous solvent to obtain a mixture; and reacting the mixture at 25-200 DEG C, wherein the anhydrous magnesium salt is Mg(HDMS)2, and the anhydrous lithium salt is LiY and / or LiX; and / or, the anhydrous magnesium salt is HDMSMgX, and the anhydrous lithium salt is LiY; and / or, the anhydrous magnesium salt is HDMSMgY, and the anhydrous lithium salt is LiX. The invention also discloses a magnesium battery. The magnesium battery comprises the magnesium battery electrolyte.

Description

technical field [0001] The invention relates to the field of energy technology, in particular to a magnesium battery electrolyte, a preparation method thereof and a magnesium battery. Background technique [0002] In recent years, magnesium batteries have attracted widespread attention in the industry due to their higher volumetric energy density than lithium batteries. However, the development of magnesium batteries is still very slow, one of the main reasons is the lack of suitable electrolyte and cathode materials. [0003] At present, the synthesis of electrolytes for magnesium batteries is mainly based on Lewis acid-base reactions in ether solvents. Lewis bases are usually magnesium salts with non-nucleophilic properties, and Lewis acids are aluminum-containing or boron-containing compounds. Unfortunately, when using an aluminum-based magnesium-sulfur battery electrolyte, due to the close electrochemical reduction potentials of metal magnesium and metal aluminum, magn...

Claims

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Application Information

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IPC IPC(8): H01M10/0563H01M10/0568H01M10/054
CPCH01M10/054H01M10/0563H01M10/0568H01M2300/002H01M2300/0025H01M2300/0091Y02E60/10
Inventor 张跃钢范海燕郑召召吴扬
Owner TSINGHUA UNIV
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