Positive active material for rechargeable magnesium battery and rechargeable magnesium battery

A positive electrode active material, magnesium secondary battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as failure to meet the characteristics of secondary batteries, slow development of magnesium secondary batteries, etc.

Inactive Publication Date: 2012-10-10
SHOEI CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In Non-Patent Document 1, it is proposed to use Mg 1.03 mn 0.97 SiO 4 Magnesium secondary batteries are used as positive electrode active materials, but the batteries cannot meet the practical requirements for secondary batteries. Therefore, compared with lithium-ion secondary batteries, the development of magnesium secondary batteries is slow
[0007] On the other hand, non-patent literature 2 published research results on magnesium cobalt silicate (magnesium cobalt silicate) with a layered structure, but the cobalt magnesium silicate was not used as the positive electrode material of the secondary battery.

Method used

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  • Positive active material for rechargeable magnesium battery and rechargeable magnesium battery
  • Positive active material for rechargeable magnesium battery and rechargeable magnesium battery
  • Positive active material for rechargeable magnesium battery and rechargeable magnesium battery

Examples

Experimental program
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Embodiment 1

[0078] [Manufacture of cathode material by template method]

[0079]

[0080] In order to obtain the composition as described in Table 1 below, each raw material described in Table 1 was dissolved in pure water to prepare a mixed solution having a concentration of 1 mol / liter. It should be noted that the SiO described in Table 1 2 The raw material used is silicon dioxide with a particle size of 15-20nm.

[0081]

[0082] 4.2 g of polyvinylpyrrolidone (Mw=30000) was stirred and dissolved in 300 ml of ion-exchanged water, and potassium persulfate (0.14 g) and 31.5 mL of styrene were further added. Argon gas was blown into the obtained mixed solution at room temperature for 1 hour to deoxidize, and then, it was heated to 70° C. and polymerized in an argon atmosphere for 24 hours. Then, it was centrifuged for 30 minutes to arrange the synthesized monodisperse polystyrene (PS) spherical powder into colloid crystals, and dried at 50°C for 24 hours. Further, the PS spheres wer...

Embodiment 2

[0098] [Manufacture of positive electrode active material by spray pyrolysis method]

[0099] In order to obtain the composition as described in Table 2 below, the raw materials described in Table 2 were dissolved in pure water to prepare a raw material solution having a concentration of 0.6 mol / liter.

[0100] The prepared mixed solution was formed into fine droplets using an ultrasonic nebulizer, and air was used as a carrier gas to carry out thermal decomposition by spraying in an electric furnace heated to 600°C, and the product was recovered.

[0101] Then, use methanol as a dispersion medium, utilize planetary ball mill to carry out wet pulverization to the product obtained, and according to the atmosphere and temperature described in the following table 2, carry out heat treatment for 4 hours, thereby obtain the sample 2-1~ 2-7. In the same manner as in Example 1, carbon coating treatment was performed on each of the obtained samples.

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Abstract

The invention aims to provide a positive active material for a rechargeable magnesium battery and the rechargeable magnesium battery. Charge and discharge can be realized when the positive active material is used in the rechargeable magnesium battery. In addition, the positive active material can improve characteristics of the rechargeable magnesium battery. The positive active material for the rechargeable magnesium battery is represented by the molecular formula MgMSiO4, wherein M contains at least one element selected from Co, Ni and Fe.

Description

technical field [0001] The present invention relates to a positive electrode active material for a magnesium secondary battery and a magnesium secondary battery. Background technique [0002] In recent years, as various environmental problems such as the global greenhouse effect and the urban greenhouse effect have become increasingly prominent, the demand for secondary batteries, especially lithium-ion secondary batteries, as a substitute for fossil fuels has increased dramatically. Compared with conventional lead secondary batteries, nickel-cadmium secondary batteries, etc., lithium ion secondary batteries are widely used as power sources for electronic devices such as mobile phones and notebook personal computers due to their light weight and large capacity. Recently, lithium ion secondary batteries are also used as batteries for electric vehicles, plug-in hybrid vehicles, electric bicycles, and the like. [0003] However, lithium, which is a raw material for lithium-ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M10/054
CPCY02E60/12H01M4/5825H01M10/054C01B33/32Y02E60/10
Inventor 杨军努丽燕娜
Owner SHOEI CHEM IND CO LTD
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