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Non-aqueous electrolytic solution, magnesium secondary battery of non-aqueous electrolytic solution

A non-aqueous electrolyte and magnesium secondary battery technology, applied in secondary batteries, circuits, electrical components, etc., to achieve the effect of easy preparation and high coulombic efficiency

Active Publication Date: 2019-08-02
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many types of electrolytes reported in the literature, so far no electrolyte system can meet all the performance requirements of the electrolyte in the battery system, namely: 1) simple and easy to prepare; 2) wide voltage window (>3.5V vs .Mg); 3) does not corrode the button battery case; 4) has non-nucleophilicity, and does not have a nucleophilic reaction with high-capacity sulfur cathode or selenium cathode; 5) high-efficiency magnesium deposition / dissolution efficiency (>99%); 6 ) High ionic conductivity

Method used

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  • Non-aqueous electrolytic solution, magnesium secondary battery of non-aqueous electrolytic solution
  • Non-aqueous electrolytic solution, magnesium secondary battery of non-aqueous electrolytic solution
  • Non-aqueous electrolytic solution, magnesium secondary battery of non-aqueous electrolytic solution

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Weigh 0.120g of tris(hexafluoroisopropoxy) borate into a vial with an electronic balance, take 2mL of ethylene glycol dimethyl ether into the above vial with a pipette gun, and then weigh 0.010g of anhydrous fluorine Magnesium chloride is placed in the above-mentioned vial containing the organic solvent and organoborane, and a magnet is added to carry out magnetic stirring for 10 hours. After being completely dissolved, it is prepared into a non-aqueous electrolyte.

[0045] In a glove box full of argon, the electrolyte is used as the electrolyte of the assembled battery, the stainless steel sheet is the positive electrode, and the magnesium sheet is the negative electrode assembled into a standard button cell, and the battery is subjected to cyclic voltammetry (see figure 1 ), the scanning voltage range is -1-4.0V vs. Mg. The figure shows that the electrolyte has an excellent ability to reversibly deposit-dissolve magnesium, and that the stable voltage of the electroly...

Embodiment 2

[0047] Weigh 0.120g of tris(hexafluoroisopropoxy) borate into a vial with an electronic balance, take 2mL of ethylene glycol dimethyl ether into the above vial with a pipette gun, and then weigh 0.005g of anhydrous fluorine Magnesium chloride is placed in the above-mentioned vial containing the organic solvent and organoborane, and a magnet is added to carry out magnetic stirring for 10 hours. After being completely dissolved, it is prepared into a non-aqueous electrolyte.

[0048] In a glove box filled with argon, the electrolyte is used as the electrolyte of the assembled battery, the stainless steel sheet is used as the positive electrode, and the magnesium sheet is used as the negative electrode to assemble a standard button battery, and the battery is subjected to cyclic voltammetry test, and the scanning voltage range is - 1-4.0V vs. Mg. The electrolyte has an excellent ability of reversibly depositing and dissolving magnesium, and the stable voltage of the electrolyte i...

Embodiment 3

[0049] Weigh 0.120g of tris(hexafluoroisopropoxy) borate into a vial with an electronic balance, take 2mL of ethylene glycol dimethyl ether into the above vial with a pipette gun, and then weigh 0.020g of anhydrous fluorine Magnesium chloride is placed in the above-mentioned vial containing the organic solvent and organoborane, and a magnet is added to carry out magnetic stirring for 10 hours. After being completely dissolved, it is prepared into a non-aqueous electrolyte.

[0050] In a glove box filled with argon, the electrolyte is used as the electrolyte of the assembled battery, the stainless steel sheet is used as the positive electrode, and the magnesium sheet is used as the negative electrode to assemble a standard button battery, and the battery is subjected to cyclic voltammetry test, and the scanning voltage range is - 1-4.0V vs. Mg. The electrolyte has an excellent ability of reversibly depositing and dissolving magnesium, and the stable voltage of the electrolyte i...

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Abstract

The invention belongs to the technical field of secondary energy-storing batteries, and in particular relates to nonaqueous electrolyte and a magnesium secondary battery of the nonaqueous electrolyte. The nonaqueous electrolyte is a nonaqueous organic solvent, inorganic magnesium salt and organic borane, wherein the molar ratio of the organic borane to the inorganic magnesium salt is (0.2-20):1; and the nonaqueous organic solvent is an ether organic solvent. The magnesium secondary battery is formed by assembling the nonaqueous electrolyte, a positive electrode and a negative electrode. Compared with the existing electrolyte for the magnesium secondary battery, the nonaqueous electrolyte has the advantages that the nonaqueous electrolyte has wider electrochemical stable window (-4.0V vs.Mg) and higher magnesium deposition / solvent coulombic efficiency (99.8%), does not corrode base metal current collectors of stainless steel, aluminum foil and the like, is non-nucleophilic and is easy to prepare. Compared with the traditional magnesium secondary battery, the magnesium secondary battery provided by the invention has higher charging / discharging capacity, rate capability and long circulation property.

Description

technical field [0001] The invention belongs to the technical field of secondary energy storage batteries, and in particular relates to a non-aqueous electrolytic solution and a magnesium secondary battery of the non-aqueous electrolytic solution. Background technique [0002] Secondary energy storage batteries, especially lithium-ion battery technology, have been widely used in various fields of our lives. However, lithium-ion battery technology now faces three major challenges: safety, price, and energy density. Traditional lithium-ion batteries use graphite as the negative electrode, organic electrolyte as the electrolyte, and lithium cobaltate as the positive electrode. When the lithium-ion battery is used improperly, dendrites will be generated on the negative electrode, which will pierce the separator and cause an internal short circuit of the battery, causing a safety hazard. Moreover, with the vigorous development of pure electric vehicles and the continuous mining...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0566H01M10/0569H01M10/0568H01M10/054
CPCH01M10/054H01M10/0566H01M10/0568H01M10/0569Y02E60/10
Inventor 崔光磊张忠华崔子立许慧敏乔立鑫王晓刚董杉木刘志宏
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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