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Magnesium ion battery negative electrode material prepared by manganese acetate tetrahydrate glycerol solvent method

A manganese acetate negative electrode, magnesium ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of small specific capacity, limited magnesium deposition-dissolution efficiency, short circuit of positive and negative electrodes, etc., and achieve charge-discharge cycle performance. Excellent, good research and development prospects, good effect of electrochemical reaction reversibility

Inactive Publication Date: 2019-04-19
GUILIN UNIVERSITY OF TECHNOLOGY
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AI Technical Summary

Problems solved by technology

The surface of Mg and Mg alloy negative electrode materials is easy to form a dense passivation film that is difficult for magnesium ions to pass through, which limits the efficiency of magnesium deposition-dissolution, and may form columnar crystals that may cause a short circuit between the positive and negative electrodes. Therefore, in order to avoid potential safety hazards, research and development reactions The equilibrium potential is less than 1.0V (vs.Mg / Mg 2+ ) negative electrode material is an important direction for the development of magnesium ion batteries
The theoretical specific capacity of manganese oxide is 755mAh / g, and the redox potential is about 0.87V (vs.Mg / Mg 2+ ), but its actual specific capacity is small

Method used

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  • Magnesium ion battery negative electrode material prepared by manganese acetate tetrahydrate glycerol solvent method
  • Magnesium ion battery negative electrode material prepared by manganese acetate tetrahydrate glycerol solvent method
  • Magnesium ion battery negative electrode material prepared by manganese acetate tetrahydrate glycerol solvent method

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Embodiment

[0014] (1) Disperse 12.25 g of commercially available analytically pure manganese acetate tetrahydrate in 100 mL of glycerol, stir, heat to 120 ° C, keep warm and stir for 4 hours, then transfer the beaker to an oven that has been heated to 50 ° C in advance to keep warm and static After the powder product is completely settled at the bottom of the beaker, carefully pour out the upper layer of glycerin while it is hot, repeatedly wash the residual glycerin with absolute ethanol, and dry it in an oven at 60°C for 10 hours to obtain anhydrous manganese acetate. The XRD spectrum and the SEM photo of anhydrous manganese acetate are shown in figure 1 , figure 2 , the results show that anhydrous manganese acetate is a layered structure.

[0015] (2) Fully grind and mix the anhydrous manganese acetate prepared in step (1), acetylene black, and polyvinylidene fluoride (PVDF) binder in an agate mortar in a mass ratio of 7:2:1, and add dropwise to mix Analytical pure N-methylpyrrolid...

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Abstract

The invention discloses a magnesium ion battery negative electrode material prepared by a manganese acetate tetrahydrate glycerol solvent method. The method comprises the steps: removing crystalline water in manganese acetate tetrahydrate through a glycerol solvothermal method to obtain anhydrous manganese acetate of a layered structure; manufacturing an electrode plate, and assembling a magnesiumion semi-battery. Electrochemical test results show that anhydrous manganese acetate has electrochemical reversible magnesium storage performances, wherein the reaction equilibrium potential is about0.87V (vs.Mg / Mg2+), the first discharge capacity can reach 63.5 mAh / g, the circulation capacity and the electrochemical reversibility are superior to those of manganous oxide. The method can avoid the generation of magnesium metal column crystals which may cause potential safety hazards, and the method has good research and development prospects.

Description

technical field [0001] The invention relates to a magnesium ion battery negative electrode material, in particular to a magnesium ion battery negative electrode material prepared by manganese acetate tetrahydrate glycerol solvent method. Background technique [0002] Magnesium-ion batteries have high specific energy (the theoretical specific energy of metal magnesium reaches 2205Ah / kg, 3832mAh / cm 3 ), stable chemical properties, low price, abundant resources, and environmental friendliness, it is a strong competitor that is expected to replace lithium-ion batteries in the future. However, magnesium-ion battery research is still in its infancy. The research on anode materials for magnesium-ion batteries is relatively lagging behind, and the reports are limited to Mg, Sn, Sb, Bi metals and their alloys and nano-Li 4 Ti 5 o 12 . The surface of Mg and Mg alloy negative electrode materials is easy to form a dense passivation film that is difficult for magnesium ions to pass ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M10/054
CPCH01M4/505H01M10/054Y02E60/10
Inventor 杨建文仝蒙恩王陆阳熊伟雄黄斌李延伟
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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