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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  • Abstract
  • Description
  • Claims
  • Application Information

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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 dissolutio

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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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Example Embodiment

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

[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 salt is generally regarded as an ordinary salt, which does not have acidity or alkalinity. After a large number of experiments, the present invention pioneered the preparation of the magnesium battery electrolyte using organic magnesium salt as Lewis base and inorganic lithium salt as Lewis acid. The Lewis acid can absorb electrons, the Lewis base provides electrons, and the Lewis acid Under the action of the complexing agent, the coordination anion and the coordination cation are respectively obtained with the Lewis base, thereby forming a...

Example Embodiment

[0060] Example

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

[0062] In a glove box with oxygen and water content of less than 1 ppm and filled with argon, 1035.12 mg of anhydrous Mg (HMDS) 2 And 254.34mg anhydrous lithium chloride (LiCl) (anhydrous Mg (HMDS) 2 And anhydrous lithium chloride molar ratio of 1:2) mixed in 10 mL of tetrahydrofuran (THF), and reacted at 25° C. for 24 hours to obtain an electrolyte for a magnesium battery. The electrolyte is subjected to nuclear magnetic analysis and Raman spectroscopy.

[0063] See figure 2 with image 3 As shown, the nuclear magnetic analysis results show that after adding Mg(HMDS) 2 Later, the coordination environment of LiCl changed significantly, that is, anhydrous MgCl 2 It reacted with anhydrous LiCl in THF, and the chemical shift shifted 0.3ppm, which proved [HMDSLiCl] - The generation. The results of Raman spectroscopy showed that at 242cm -1 Exist at...

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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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