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Magnesium battery electrolyte, preparation method thereof and magnesium battery

An electrolyte and magnesium battery technology, applied in the energy field, can solve problems such as easy leakage, mismatched electrolyte, short circuit of the battery, etc.

Active Publication Date: 2020-07-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the development of magnesium batteries is still very slow, one of the main reasons is the lack of suitable electrolyte
[0003]Currently, the developed HMDS system, MACC system, B-based system and Mg(TFSI)2 system and other magnesium-sulfur battery electrolysis Liquid, there are common problems such as internal short circuit and easy leakage of the battery
The newly developed electrolyte based on magnesium borohydride-polytetrahydrofuran is in a gel state. Although it can reduce the possibility of short circuit inside the battery and avoid problems such as electrolyte leakage, it is a pity. Unfortunately, the electrolyte does not match the sulfur cathode

Method used

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  • Magnesium battery electrolyte, preparation method thereof and magnesium battery
  • Magnesium battery electrolyte, preparation method thereof and magnesium battery
  • Magnesium battery electrolyte, preparation method thereof 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 magnesium battery electrolyte, comprising:

[0049] S100, mixing anhydrous magnesium salt, anhydrous polyol 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 MgXBH 4 , the anhydrous polyhydric alcohol is OH-R-OH, and the R is selected from the general formula of -(C n1 h n2 Y n3 o n4 )-, wherein the Y is selected from one or more of the halogen ions and the halide-like ions of -1 valence, and the n 1 Any integer selected from 2 to 10, the n 2 , n 3 , n 4 Both are integers greater than or equal to 0, n 2 +n 3 ≤2n 1 .

[0052] Described anhydrous magnesium salt is MgXBH 4 It can be prepared by known synthetic methods. In one embodiment, the anhydrous magnesium salt is MgXBH 4 The preparation method is: Mg(BH 4 ) 2 and MgX 2 Add the non-aqueous solvent (orga...

Embodiment

[0063] Preparation of magnesium battery electrolyte:

[0064] In an argon-filled glove box containing less than 1 ppm of oxygen and water, 108 mg of anhydrous Mg(BH 4 ) 2 and 190.42 mg anhydrous MgCl 2 Dissolve in 4mL tetrahydrofuran (THF), stir at room temperature for 24h to obtain MgCl(THF) 3 solution.

[0065] 3280mg of anhydrous tetraethanol fluoride (C 8 h 6 f 12 o 5 , abbreviated as PFTEG) was dissolved in 4 mL of tetrahydrofuran (THF), and stirred at room temperature for 6 h to obtain a PFTEG solution. MgClBH 4 Solution and PFTEG solution (volume ratio 1:1) were mixed and reacted at 25°C for 24h to obtain a gel state magnesium battery electrolyte, such as figure 2 shown. The electrolyte was subjected to infrared spectroscopic analysis and Raman spectroscopic analysis.

[0066] see image 3 and Figure 4 As shown, the results of infrared spectrum analysis show that after adding MgClBH 4 After that, the infrared absorption peaks of the two-OH in PFTEG or te...

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Abstract

The invention relates to a magnesium battery electrolyte. The electrolyte comprises gel-state electrolyte salt, the chemical formula of the electrolyte salt is [MgXMp] [B (ORO) 4] n, wherein X is selected from one or more of -monovalent halogen ions and halogen-like ions; m is a coordination agent; p is selected from any integer from 1 to 5; n is selected from any positive integer; R is selected from a group with a general formula of -(Cn1Hn2Yn3O4)-, Y is selected from one or more of -monovalent halogen ions and halogen-like ions, n1 is selected from any integer between 2 and 10, n2, n3 and n4are all integers greater than or equal to 0, and n2 + n3 is less than or equal to 2n1. The invention also relates to a preparation method of the magnesium battery electrolyte. The preparation methodcomprises the following steps: mixing anhydrous magnesium salt, anhydrous polyol and a non-aqueous solvent to obtain a mixture; and reacting the mixture at a temperature of 25 DEG C to 200 DEG C, wherein the anhydrous magnesium salt is MgXBH4, and the anhydrous polyol is OH-R-OH. The invention further relates to a magnesium battery comprising 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] Magnesium batteries have attracted widespread attention because their volumetric energy density is higher than that of lithium batteries, especially magnesium-sulfur batteries. The theoretical energy density of magnesium-sulfur batteries is greater than 4000WH / L. But the development of magnesium batteries is still very slow, one of the main reasons is the lack of suitable electrolyte. [0003] At present, the developed HMDS system, MACC system, B-based system and Mg(TFSI) 2 Magnesium-sulfur battery electrolytes such as systems, etc., generally have problems such as internal short circuit of the battery and easy leakage. The newly developed electrolyte based on magnesium borohydride-polytetrahydrofuran is in a gel state. Although it can reduce the possibility of s...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/054
CPCH01M10/0565H01M10/058H01M10/054Y02E60/10Y02P70/50
Inventor 张跃钢范海燕
Owner TSINGHUA UNIV
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