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A kind of magnesium secondary battery and preparation method thereof

A magnesium secondary battery and magnesium salt technology, applied in secondary batteries, battery electrodes, non-aqueous electrolyte storage batteries, etc., can solve the problems of rate performance to be improved, poor kinetics, etc., and achieve good industrialization prospects and technological processes Ease of control and high theoretical specific capacity

Active Publication Date: 2019-06-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, magnesium secondary batteries face many problems including poor kinetics and rate performance to be improved.

Method used

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  • A kind of magnesium secondary battery and preparation method thereof
  • A kind of magnesium secondary battery and preparation method thereof
  • A kind of magnesium secondary battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Prepare iodine-containing cathode material:

[0036] Mix 5 g of nanoporous carbon with 3 g of iodine, raise the temperature to 145 °C in vacuum at a heating rate of 1 °C / min, keep it for 1 h, and then cool down to room temperature at a cooling rate of 1 °C / min to obtain an iodine-containing positive electrode material, its SEM topography, see figure 1 .

[0037] 2) Prepare positive electrode:

[0038] The prepared iodine-containing positive electrode material was uniformly mixed with the binder polytetrafluoroethylene in a mass ratio of 8:2, and placed at 60° C. for 10 h under vacuum conditions to obtain a positive electrode.

[0039] 3) Preparation of electrolyte:

[0040] Mg(HDMS) 2 Dissolve in tetraethylene glycol dimethyl ether to make Mg(HDMS) 2 The concentration in the solution is 0.1 Mol / L, and the additive LiTFSI is added under stirring 2 , LiTFSI 2 with Mg(HDMS) 2 The molar ratio is 5:1, fully stir and mix evenly, then add MgCl 2 , MgCl 2 with Mg(H...

Embodiment 2

[0044] 1) Prepare iodine-containing cathode material:

[0045] Combine 8g of porous flexible carbon cloth with 4g of I 2 Mix, heat up to 160°C with a heating rate of 2°C / min in an Ar gas atmosphere, keep for 30h, and then cool down to room temperature at a cooling rate of 1°C / min to obtain an iodine-containing positive electrode material, and its SEM morphology Figure, see figure 2 .

[0046] 2) Prepare positive electrode:

[0047] The obtained iodine-containing positive electrode material was placed at 80°C for 20h under vacuum conditions to obtain the positive electrode;

[0048] 3) Preparation of electrolyte:

[0049] 25g magnesium salt Mg(HDMS) 2 Dissolved in 20ml TEGDME solvent, stirred for 12h, named solution 1; 6.8gMgCl 2 Dissolve in 10ml TEGDME solvent, stir for 12h, named as solution 2; slowly add solution 2 into solution 1, stir for 24h, named as solution 3, add 18.6g AlCl 3 The powder was added to solution 3, and fully stirred for 24 hours to obtain an electro...

Embodiment 3

[0055] 1) Prepare iodine-containing cathode material:

[0056] Dissolve 6g of iodine in 5mL of ethanol, add 3.5g of carbon nanotubes after fully stirring, continue to stir for 2h, take it out, and place it at 60°C for 5h under vacuum conditions to obtain an iodine-containing positive electrode material;

[0057] 2) Prepare positive electrode:

[0058] The obtained iodine-containing positive electrode material is uniformly mixed with the binder PTFE in a mass ratio of 6:4, and placed at 60° C. for 10 h under vacuum conditions to obtain the positive electrode;

[0059] 3) Preparation of electrolyte:

[0060] MgTFSI 2 Dissolved in dimethylformamide to make MgTFSI 2 The concentration in the solution is 10 Mol / L, and the additive MgCl is added under stirring 2 , MgCl 2 with MgTFSI 2 The molar ratio of the mixture is 2:1, fully stirred and mixed evenly to obtain the electrolyte;

[0061] 4) In a glove box filled with argon gas, the positive electrode, magnesium strip negative...

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Abstract

The invention discloses a rechargeable magnesium battery and a preparation method thereof. The rechargeable magnesium battery comprises an anode, a magnesium metal cathode, electrolyte, and a diaphragm arranged between the anode and the cathode, wherein active substance of the anode contains iodine; the electrolyte contains magnesium salt. By selecting the active material anode containing iodine and an electrolyte system containing magnesium salt and taking metal magnesium as a cathode, the rechargeable magnesium battery obtains high specific capacity, can realize reverse charging and discharging, and has a higher discharge platform (2.0Vvs.Mg / Mg2+). The rechargeable magnesium battery has the characteristics of high energy density, long service life and better safety. The technical process of the rechargeable magnesium battery is easy to control, and rechargeable magnesium battery has a good industrialization prospect.

Description

technical field [0001] The invention relates to a magnesium secondary battery and a preparation method thereof, belonging to the technical field of battery energy. Background technique [0002] Magnesium secondary batteries are considered to be an ideal energy storage conversion device and have received extensive attention. Metal magnesium has better safety (no dendritic problem) than metal lithium. It can remain stable in the air and has no pollution to the environment. In particular, magnesium is more abundant on Earth than lithium and is less expensive to develop. Since magnesium ions are in the form of Mg 2+ Exists in the form of, compared to the Li-based + For lithium-ion batteries that are transported in the form of lithium-ion batteries, they can have higher capacity storage densities. In addition, the negative electrode potential of metallic magnesium is low (−2.37 V vs. SHE). Therefore, magnesium-ion batteries can theoretically achieve higher energy densities....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/05H01M10/0561H01M4/36
CPCH01M4/364H01M10/05H01M10/0561H01M2300/002Y02E60/10
Inventor 田华军韩伟强
Owner ZHEJIANG UNIV
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