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Positive electrode active material for magnesium batteries

A positive active material, magnesium battery technology, applied in active material electrodes, battery electrodes, electrodes of primary batteries, etc., can solve problems such as capacity decline, and achieve the effect of high capacity retention rate and high working voltage

Pending Publication Date: 2021-01-15
FUJIFILM WAKO PURE CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the magnesium battery described in Non-Patent Document 2 operates at a high voltage, but has the problem that the capacity per cycle drops significantly when the charge-discharge rate is low

Method used

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  • Positive electrode active material for magnesium batteries
  • Positive electrode active material for magnesium batteries
  • Positive electrode active material for magnesium batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0371] [Example 1: Fabrication of a magnesium battery using the positive electrode active material of the present invention]

[0372] Mixed silver(I) sulfate (Ag 2 SO 4 ) (positive electrode active material: manufactured by FUJIFILM Wako Pure Chemical Corporation) 70 parts by mass, acetylene black (conductive additive: manufactured by Denka Company Limited) 15 parts by mass, and polytetrafluoroethylene (binder: manufactured by Sigma-Aldrich Japan) 15 parts by mass , to produce positive electrode mixture film by dry method. This positive electrode mixture film was bonded to a platinum mesh (current collector: 80 mesh, thickness 80 μm), and vacuum-dried at 120° C. for 3 hours to prepare a positive electrode. The positive electrode, the negative electrode, the reference electrode, and the electrolytic solution were placed in a glass cell (manufactured by BAS Inc.) in an argon-filled glove box to fabricate a magnesium battery. In addition, metal magnesium rods (manufactured by ...

experiment example 1

[0379] [Experimental example 1: Charge and discharge test of magnesium battery]

[0380] At room temperature, a charge-discharge test was performed at a rate of 0.1C at a cut-off potential of 0.7 to 2.8V (vs. reference electrode) using the magnesium battery produced in Example 1 in an argon-filled glove box. In addition, an electrochemical measurement system (manufactured by Bio-Logic Science Instruments) was used in this test.

[0381] The obtained charge-discharge curves of the 1st, 3rd, and 5th cycles are shown in figure 1 .

[0382] The horizontal axis (mAh / g) in the graph represents the discharge capacity at each voltage, and the vertical axis (V) in the graph represents the voltage of the positive electrode based on the reference electrode. Also, the solid line in the figure represents the result of the first cycle, the dotted line in the figure represents the result of the third cycle, and the dotted line in the figure represents the result of the fifth cycle.

experiment example 2

[0383] [Experimental example 2: Charge and discharge test of magnesium battery]

[0384] A charge-discharge test was performed in the same manner as in Experimental Example 1 except that the magnesium battery produced in Comparative Example 1 was used instead of the magnesium battery produced in Example 1.

[0385] The obtained charge-discharge curves of the 1st, 3rd, and 5th cycles are shown in figure 2 .

[0386] The horizontal axis (mAh / g) in the graph represents the discharge capacity at each voltage, and the vertical axis (V) in the graph represents the voltage of the positive electrode based on the reference electrode. Also, the solid line in the figure represents the result of the first cycle, the dotted line in the figure represents the result of the third cycle, and the dotted line in the figure represents the result of the fifth cycle.

[0387] Based on the value of the discharge capacity of the positive electrode after each cycle obtained in Experimental Example ...

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Abstract

The present invention addresses the problem of providing: a positive electrode active material for magnesium batteries; and a magnesium battery which uses this positive electrode active material and has a high operating voltage with respect to magnesium, and which is able to be repeatedly charged and discharged with a high capacity retention rate. The present invention relates to: a positive electrode active material for magnesium batteries, which contains a compound represented by general formula (1); a positive electrode material composition for magnesium batteries; a positive electrode formagnesium batteries; and a magnesium battery. (1): AgpSO4 (In formula (1), p represents a number satisfying 0 < p <=2.).

Description

technical field [0001] The invention relates to a positive electrode active material for a magnesium battery, a positive electrode material composition for a magnesium battery containing the positive electrode active material, a positive electrode for a magnesium battery, and a magnesium battery. Background technique [0002] Magnesium has a large capacitance per unit volume because its ions are polyvalent ions. In addition, magnesium has a higher melting point than lithium and is safer, and has the advantages of less uneven distribution of resources on the earth, abundant resources, and low cost. Therefore, a magnesium battery using metallic magnesium as a negative electrode has attracted attention as a next-generation battery replacing a lithium battery. [0003] Many examples of magnesium batteries have been reported so far, but magnesium ions after intercalation of active materials are difficult to diffuse, and therefore there are not many magnesium batteries that perfo...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01G11/30H01G11/62H01M4/136H01M4/1397H01M4/62H01M6/16H01M10/054H01M10/0568H01M12/08
CPCH01M10/054H01M4/58H01M10/0568H01M4/136Y02E60/10H01G11/04H01G11/02H01G11/06H01G11/50H01G11/46H01M4/625H01M4/622H01M10/0567H01M4/466H01M2300/0025C07F5/025C07F9/304C07F9/145C07F9/46C07F9/4875C07F9/094C07F9/3834C07F3/02H01M4/5825H01M4/06H01M12/06H01M6/34H01M6/16H01G11/30H01G11/62H01M2004/028H01M2300/0028C01G5/006C01P2006/40H01M4/623H01M10/0569
Inventor 里和彦水田浩德冈本训明
Owner FUJIFILM WAKO PURE CHEM CORP
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