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Low-cost aluminum-based electrolyte and aluminum battery application thereof

A technology of electrolyte and aluminum-sulfur battery, applied in the field of electrolyte, can solve the problems of low coulombic efficiency, high production cost, and poor cycle life, and achieve the effects of high coulombic efficiency, low production cost, and low cost

Active Publication Date: 2019-05-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to overcome the defects of high electrolyte production cost, poor cycle life and low coulombic efficiency of existing aluminum-ion batteries, especially aluminum-sulfur batteries, and provide a new type of low-cost electrolyte and the use of the electrolyte in aluminum-sulfur batteries. , aluminum ion batteries, and the application of aluminum electrodeposition

Method used

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  • Low-cost aluminum-based electrolyte and aluminum battery application thereof
  • Low-cost aluminum-based electrolyte and aluminum battery application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] At room temperature, in an argon glove box, 1.3 times the amount of substance equivalent AlCl 3 Slowly added to acetamide, and magnetically stirred for 12 hours, a clear and transparent brown-yellow liquid was obtained, which was used as an electrolyte after standing still.

[0024] The above solution is used as the electrolyte, and S@mesoporous carbon (CMK-3 type) with a sulfur content of 50% is used as the positive electrode composite material. Mix and grind to make the positive pole piece, press the pole piece onto the molybdenum mesh of the positive current collector as the positive pole, use the washed and dried aluminum piece with a certain thickness and purity as the negative pole, and use the Whatman GF / A glass fiber diaphragm in argon gloves The cells in the Swagelok configuration were assembled in the box and then transferred out of the glove box. The battery was tested by cyclic voltammetry on a Solartron electrochemical workstation. Carry out the constant ...

Embodiment 2

[0026] According to the method of embodiment 1, the difference is that AlCl 3 Slowly add into acetamide according to the molar ratio of 1.2:1 to acetamide, and after it is completely dissolved, let it stand still and use it as an electrolyte.

[0027] The pole piece making and battery assembly process are the same as in Example 1. The cyclic voltammetry test was carried out on the Solartron electrochemical workstation, and the constant current charge and discharge test was carried out on the LAND tester. The cut-off voltage was 0.05-1.8V, and the charge and discharge current was 100mA. The results showed that the specific capacity of the first discharge cycle reached 1250mAh·g –1 , the specific capacity after 20 cycles is 777mAh·g –1 .

Embodiment 3

[0029] According to the method of Example 1, the difference is that the Al(OTF) of mass fraction 2% is added in the obtained clear and transparent orange-yellow solution 3 Continue to stir as an additive, and after it is completely dissolved, let it stand still and use it as an electrolyte.

[0030] The eutectic liquid at room temperature was used as the electrolyte, and the pole piece production and battery assembly process were the same as in Example 1. And carry out the constant current charge and discharge test on the LAND tester, the cut-off voltage is 0.05-1.8V, the charge and discharge current is 100mA, the result shows that adding Al(OTF) 3 Coulombic efficiency increased from 84% to 90% after being used as an additive.

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Abstract

The invention discloses a low-cost aluminum-containing electrolyte and an application of an aluminum battery thereof, and belongs to the technical field of electrochemical energy storage. Electrolyteis ionic-like liquid of aluminum halide-A and amide compound and an amount of an additive, wherein the aluminum halide-A is preferably aluminum chloride, the amide compound is preferably acetamide, and the additive contains one of aluminum halide-B (when the additive is aluminum halide-B, the extracts of the aluminum halide-B and aluminum halide A are different), Bis(trifluoromethane)sulfonimide aluminum (Al(TFSI)3), Bis(trifluoromethane)sulfonimide sodium (Na(TFSI)), Bis(trifluoromethane)sulfonimide magnesium (Mg(TFSI)2), Bis(trifluoromethane)sulfonimide zinc (Zn(TFSI)2), aluminum perchlorate(Al(ClO4)3), chloroaluminate, bromine aluminate, urea, aluminum trifluoromethanesulfonate (Al(OTF)3), benzene, toluene, chlorobenzene, and 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropylether (HFE) or more. The electrolyte can be used in the fields of aluminum ion batteries, aluminum-sulfur batteries and the like. An aluminum-sulfur battery assembled by using the electrolyte provided by the invention is high in capacity, good in cycling stability and excellent in rate capability. Meanwhile, the aluminum-sulfur battery is low in cost, does not contain high-pollution substances such as heavymetals, is easy to assemble and high in safety, and has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of electrolytes, and in particular relates to the preparation of a novel low-cost aluminum-based electrolyte and the application of the electrolyte in aluminum batteries, especially aluminum-sulfur batteries. Background technique [0002] With the increasing demand for efficient energy storage devices in modern society, lithium-ion batteries based on lithium resources are increasingly constrained by resource scarcity and high cost, making it difficult to meet future large-scale applications. With the continuous deepening of research on secondary batteries based on new materials, new structures, and new systems, a variety of new battery systems based on multi-electron reactions have been reported, and it is expected to manufacture low-cost secondary batteries with higher energy density and power density. secondary battery. As the metal element with the highest content in the earth's crust, aluminum is consid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/0569H01M10/054
CPCY02E60/10
Inventor 尉海军楚维钦张旭王洁刘世奇何世满
Owner BEIJING UNIV OF TECH
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