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A kind of aluminum chloride mixed ion battery

A technology of mixed ions and batteries, applied in the field of electrochemical energy storage, can solve the problems of difficult insertion/extraction, lack of long cycle life cathode materials for aluminum ion batteries, and hindering the promotion and application of aluminum ion batteries.

Active Publication Date: 2021-09-03
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • 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+ ) It is difficult to reversibly intercalate / extract inside the electrode material, resulting in the lack of positive electrode materials with high specific energy and long cycle life for aluminum-ion batteries; currently, Al 3+ Only in aluminum trichloride (AlCl 3 ) and organic chlorides (such as 1-ethyl-3-methylimidazolium chloride [EMIm]Cl) reversibly deposited / dissolved 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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  • A kind of aluminum chloride mixed ion battery
  • A kind of aluminum chloride mixed ion battery
  • A kind of aluminum chloride mixed ion battery

Examples

Experimental program
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Effect test

specific Embodiment 1

[0031] With metal aluminum as the negative electrode, AlCl 3 - [EMIm]Cl as 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 7.31 g [EMIm]Cl in the glove box, then weigh 8.64 g 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 -Preparation method of GIC cathode material: weigh 0.12 g of natural flake graphite and 1.11 g of CuCl in a glove box 2 , wherein the molar ratio of graphite to chloride is 2: 3, it is put into a quartz tube and vacuumized for 5 min and then melt-sealed. Put the sealed quartz test tube into the muffle furnace, raise the temperature to 380 °C at 5 °C / min, keep the temperature for 2 h, and then 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 ...

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 0.164 g of natural flake graphite and 0.406 g 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. The fused-sealed quartz test tube was heated in a muffle furnace at 450 °C for 1 h, the product was washed with deionized water until it had no color, and dried 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 aluminu...

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 of graphite to graphite is 1: 4n (n is the order), the reaction temperature is 660 ° C, and the reaction time is 12 hours. The experimental process is: first put the reactants into a heat-resistant quartz glass tube, mix well and then vacuumize for 5 minutes , and then carry out fusion sealing, after the reaction is completed, cool the reaction tube with liquid nitrogen to liquefy the gas in it, take it out, wash it and dry it to obtain the product. The elect...

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Abstract

The invention provides an aluminum-chloride mixed ion battery, comprising: a positive pole, a negative pole, an electrolyte and a diaphragm between the positive and negative poles, the material of the positive pole is a chloride-graphite intercalation compound MCl X ‑GIC, the electrolyte is an ionic liquid composed of metal chlorides and organic chlorides. The innovation lies in the successful application of graphite interlayer compounds in ion batteries, using the theory of hybrid chemistry to integrate aluminum-ion batteries and chloride-ion battery systems to form aluminum-chloride mixed-ion batteries, and the aluminum-chloride mixed-ion batteries formed The charge carrier of the system is not single, and what is actually embedded in the positive electrode of the hybrid battery is Cl ‑ (and possibly AlCl 4 ‑ ), but it is Al 2 Cl 7 ‑ . During the charging and discharging process, only the intercalation and extraction of ions occurs, no other chemical reactions occur, and the electrode structure does not change, so it has good electrochemical stability.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, and mainly relates to an 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 8.04 Ah / cm 3 , is the volume specific capacity of lithium metal (2.06 Ah / 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 reason i...

Claims

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Application Information

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Patent Type & Authority Patents(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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