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Novel aluminum-chlorine mixed ion battery

A technology of mixed ions and aluminum chloride, which is applied in the field of electrochemical energy storage, can solve the problems that hinder the popularization and application of aluminum ion batteries, the lack of specific energy and long cycle life of positive electrode materials in aluminum ion batteries, difficult insertion/extraction, etc., to achieve extended activity Potential, enhanced rate performance, and good electrochemical stability

Active Publication Date: 2019-03-01
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the past few decades, researchers have been working on the commercialization of rechargeable aluminum-ion batteries, but the reason is that the positive electrode is the key to the problem: due to the high charge density, aluminum ions (Al 3+ ) is difficult to intercalate / extract reversibly inside the electrode material, resulting in the lack of positive electrode materials with high specific energy and long cycle life for Al-ion batteries; currently, Al 3+ Only in aluminum trichloride (AlCl 3 ) and organic chlorides (such as 1-ethyl-3-methylimidazolium chloride [EMIm]Cl) composed of reversible deposition / dissolution in ionic liquids, and such ionic liquids have negative effects on electrode materials, current collectors and packaging shells, etc. are highly corrosive
The above unfavorable factors have hindered the popularization and application of aluminum ion batteries

Method used

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  • Novel aluminum-chlorine mixed ion battery
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Examples

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Effect test

specific Embodiment 1

[0031] With metal aluminum as the negative electrode, AlCl 3 -[EMIm]Cl is the electrolyte, with CuCl 2 -GIC is the positive electrode material, assembled into an aluminum-chloride mixed ion battery.

[0032] The preparation method of the electrolyte is: weigh 7.31g [EMIm]Cl in the glove box, then weigh 8.64g AlCl 3 , the AlCl 3 Slowly add it to [EMIm]Cl until the ionic liquid turns transparent, which is the prepared electrolyte.

[0033] CuCl 2 -The preparation method of GIC cathode material: weigh 0.12g of natural flake graphite and 1.11g of CuCl in the glove box 2 , wherein the molar ratio of graphite to chloride is 2:3, put it into a quartz tube and vacuumize it for 5 minutes and then seal it. Put the sealed quartz test tube into the muffle furnace, raise the temperature to 380°C at 5°C / min, keep the temperature for 2h, and cool down to room temperature naturally. After the sample was taken out, it was washed with deionized water until it had no color, and dried in a ...

specific Embodiment 2

[0036] With metal aluminum as the negative electrode, AlCl 3 and [EMIm]Cl as the electrolyte, with FeCl 3 -GIC is the positive electrode material, assembled into an aluminum-chloride mixed ion battery. The molar ratio of the electrolyte [EMIm]Cl:AlCl 3 =1:1.5. The preparation method is as in Example 1.

[0037] FeCl 3 -The preparation method of the GIC cathode material is: weigh 0.164g of natural flake graphite and 0.406g of FeCl in the glove box 3 , in which natural flake graphite and FeCl 3 The molar ratio is 5.44:1, and then put into a quartz test tube for fusion sealing. Put the sealed quartz test tube into a muffle furnace and heat it at 450°C for 1 hour, wash the product with deionized water until it has no color, and dry it in a drying oven at 70°C to obtain the product. Characteristic XRD diffraction peaks figure 2 Prove that FeCl 3 -GIC cathode material was successfully prepared. The electrochemical performance test was carried out after the aluminum-chlori...

specific Embodiment 3

[0039] With metal aluminum as the negative electrode, aluminum trichloride AlCl 3 and [EMIm]Cl as the electrolyte, with CoCl 2 -GIC is the positive electrode material, assembled into an aluminum-chloride mixed ion battery. The molar ratio of the electrolyte [EMIm]Cl:AlCl 3 =1:1. The preparation method is as in Example 1.

[0040] CoCl 2 -The preparation method of GIC cathode material is: CoCl 2 -GIC is made of natural flake graphite and anhydrous CoCl 2 Synthesized by molten salt method, CoCl 2 The molar ratio with graphite is 1:4n (n is the order), the reaction temperature is 660°C, and the reaction time is 12h. The experimental process is: first put the reactants into a heat-resistant quartz glass tube, mix them thoroughly and then vacuumize them for 5min. After the reaction is completed, the reaction tube is cooled with liquid nitrogen to liquefy the gas in it, and after taking it out, it is washed and dried to obtain the product. The electrochemical performance tes...

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Abstract

The invention provides a novel aluminum-chlorine mixed ion battery which includes a cathode, an anode, an electrolyte, and a diaphragm between the cathode and the anode, wherein the cathode is made from a chloride-graphite intercalation compound (MClX-GIC), the electrolyte is an ionic liquid composed of a metal chloride and an organic chloride. The innovation point of the invention is that the graphite intercalation compound is successfully applied to an ion battery; by means of the theory of mixing chemistry, an aluminum ion battery system and a chlorine ion battery system are combined to form the aluminum-chlorine mixed ion battery, of which the electric charge carrier is not simple, wherein the ion who is actually embedded in the cathode of the mixed ion battery is Cl<-> (may also include AlCl4<->); however, the ion who contributes a decisive effect to deposition and dissolution processes of the aluminum anode is Al2Cl7<->. The aluminum-chlorine mixed ion battery is a design on thebasis of a new idea for an aluminum battery.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, and mainly relates to a novel aluminum-chloride mixed ion battery. Background technique [0002] Aluminum-ion battery is a potential new generation energy storage system with many outstanding advantages. First of all, aluminum is the most abundant metal element in the earth's crust, second only to oxygen and silicon, accounting for 8.23% of the total mass of the earth's crust. It has a wide range of sources and is cheap and easy to get. Secondly, metal aluminum has a very strong charge storage capacity, and its volume specific capacity can reach 8.04Ah / cm 3 , is the volume specific capacity of lithium metal (2.06Ah / cm 3 ) four times. In addition, aluminum metal also has excellent electrical conductivity, thermal conductivity and ductility. [0003] In the past few decades, researchers have been working on the commercialization of rechargeable aluminum-ion batteries, but the reaso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/054H01M10/058
CPCH01M4/362H01M4/582H01M4/587H01M10/054H01M10/058Y02E60/10Y02P70/50
Inventor 李春亮刘凯高继超张联齐
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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