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Full inorganic salt type rechargeable magnesium battery electrolyte and preparation method thereof

A technology of electrolyte solution and inorganic salt, which is applied in the field of electrochemistry, can solve problems such as hindering large-scale commercial application process, poor cycle stability, complicated preparation process, etc., and achieve large-scale commercial application, good compatibility, and preparation The effect of simple process

Active Publication Date: 2021-08-13
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, although electrolytes for rechargeable magnesium batteries have been widely concerned and researched, there are still few researches and developments on electrolytes for all-inorganic salt rechargeable magnesium batteries, and all kinds of electrolytes for rechargeable magnesium batteries that have been developed are still common. There are problems such as high production cost, complicated preparation process, high overpotential and poor cycle stability, which seriously hinder its large-scale commercial application process.

Method used

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  • Full inorganic salt type rechargeable magnesium battery electrolyte and preparation method thereof
  • Full inorganic salt type rechargeable magnesium battery electrolyte and preparation method thereof
  • Full inorganic salt type rechargeable magnesium battery electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment provides an all-inorganic salt type rechargeable magnesium battery electrolyte and a preparation method thereof, specifically as follows:

[0035] Step 1: Pretreatment of Solvents

[0036] Measure 150mL of solvent tetrahydrofuran and add it to a distillation device equipped with a double-pipe system (anhydrous and oxygen-free system), add 4.5g of metallic sodium, redistill, add high-temperature activated molecular sieves to the evaporated solvent, and place in gloves Store in box.

[0037] Step 2: Preparation of Electrolyte

[0038] Step 2-1: Accurately weigh 0.57g of magnesium chloride, 0.25g of lithium chloride and 0.16g of chromium chloride in a glove box and add them to a 100mL single-necked round bottom flask, add 20mL of the pretreated solvent tetrahydrofuran, and heat at 60°C The bath was heated to reflux for 12h.

[0039] Step 2-2: stop heating after the reflux reaction is completed, add 0.035 g of heptamethyldisilazane dropwise to the reactio...

Embodiment 2

[0041] This embodiment provides an all-inorganic salt type rechargeable magnesium battery electrolyte and a preparation method thereof, specifically as follows:

[0042] Step 1: Pretreatment of Solvents

[0043] Measure 150mL of the solvent ethylene glycol dimethyl ether and add it to a distillation device equipped with a double-pipe system (anhydrous and oxygen-free system), add 4.5g of metallic sodium, redistill, and add the evaporated solvent to the high-temperature activated Molecular sieves were stored in a glove box.

[0044] Step 2: Preparation of Electrolyte

[0045] Step 2-1: Accurately weigh 0.50g of magnesium fluoride, 0.46g of sodium chloride and 0.18g of zinc chloride in a glove box and add them to a 100mL single-necked round bottom flask, add 20mL of the pretreated solvent ethylene glycol di Methyl ether was heated to reflux in an oil bath at 80°C for 16h.

[0046] Step 2-2: stop heating after the reflux reaction is completed, add 0.055 g of tert-butyldimethyl...

Embodiment 3

[0048] This embodiment provides an all-inorganic salt type rechargeable magnesium battery electrolyte and a preparation method thereof, specifically as follows:

[0049] Step 1: Pretreatment of Solvents

[0050] Measure 150mL of the solvent diethylene glycol dimethyl ether and add it to the distillation device equipped with a double-pipe system (anhydrous and oxygen-free system), add 4.5g of metallic sodium, redistill, and add the distilled solvent to the high-temperature activated Molecular sieves were stored in a glove box.

[0051] Step 2: Preparation of Electrolyte

[0052] Step 2-1: Accurately weigh 1.14g of magnesium chloride, 0.90g of potassium chloride and 0.32g of ferric chloride in a glove box and add them to a 100mL single-necked round bottom flask, add 20mL of the pretreated solvent diethylene glycol dimethyl Ether was heated to reflux in an oil bath at 100°C for 16h.

[0053] Step 2-2: stop heating after the reflux reaction is completed, add 0.047 g of tris(tri...

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Abstract

The invention belongs to the technical field of rechargeable magnesium battery materials, and particularly provides a full inorganic salt type rechargeable magnesium battery electrolyte and a preparation method thereof. The electrolyte comprises an electrolyte magnesium salt, a cosolvent, an activating agent, an additive and an anhydrous oxygen-free organic solvent. The cosolvent can improve the solubility of the electrolyte magnesium salt in the organic solvent; the activator can effectively inhibit the electrolyte magnesium salt from generating a passive film on the magnesium surface; and the addition of the additive can improve the water resistance of the electrolyte and promote the deposition-dissolution circulation of magnesium. The preparation method of the electrolyte comprises the following steps of: taking a certain amount of the electrolyte magnesium salt, the cosolvent, the activating agent and the organic solvent to prepare a mixed solution, adding the additive into the mixed solution, and well stirring and mixing at room temperature. The electrolyte provided by the invention has the advantages of easily available raw materials, simple preparation process, low cost, low overpotential and good cycling stability, and is beneficial to large-scale commercial application.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to an electrolyte solution for an all-inorganic salt type rechargeable magnesium battery and a preparation method thereof. Background technique [0002] With the growth of the world's population and the acceleration of industrialization, the 21st century is facing two major problems, the shortage of fossil energy and environmental pollution. Therefore, the main energy will inevitably shift from fossil fuels to green energy, and this transition urgently requires the development of new green secondary batteries with high specific energy, high safety, and low cost. Among the existing chemical power supply technologies, lithium-ion batteries are widely used in various fields due to their high energy density and mature technology, but their large-scale application is limited due to low safety and high cost. [0003] Magnesium and lithium are located on the diagonal in the perio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/058H01M10/42
CPCH01M10/0567H01M10/0568H01M10/058H01M10/4235Y02P70/50Y02E60/10
Inventor 文家新李凌杰雷惊雷潘复生
Owner CHONGQING UNIV