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Rechargeable magnesium battery and preparation method thereof

A magnesium battery and magnesium salt technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of harsh preparation conditions, low working platform voltage, and high cost, and achieve simple preparation methods, high energy density, and high working voltage Effect

Active Publication Date: 2016-07-20
CONTEMPORARY AMPEREX TECH CO
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, one of the biggest bottlenecks encountered in the development of rechargeable magnesium batteries is due to the 2+ The solvation of Mg is more serious, making Mg 2+ It is difficult to perform reversible intercalation and extraction in general inorganic materials, so it is difficult to develop positive electrode active materials suitable for rechargeable magnesium batteries
Mo of the Cheverel phase structure 6 S 8 The positive electrode active material can better reversibly intercalate and release Mg 2+ , its theoretical specific capacity is 128mAh / g, but its working platform voltage is low, only 1.1V ~ 1.3V, the kinetic performance is poor, it can only be charged and discharged at a small current, and the preparation conditions are harsh and the cost is high , so it is not practical

Method used

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  • Rechargeable magnesium battery and preparation method thereof
  • Rechargeable magnesium battery and preparation method thereof
  • Rechargeable magnesium battery and preparation method thereof

Examples

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preparation example Construction

[0027]The method for preparing a rechargeable magnesium battery according to the second aspect of the present invention is used to prepare the rechargeable magnesium battery according to the first aspect of the present invention, comprising the steps of: (1) dissolving the transition metal salt in deionized water to form a first solution, Dissolving cyanide salt in deionized water to form a second solution, slowly adding the first solution dropwise to the second solution under magnetic stirring conditions, stirring, centrifuging, and drying, to obtain a Prussian blue compound with an open framework structure; ( 2) Add the positive electrode active material, positive electrode conductive agent, and positive electrode binder into the solvent according to a certain mass ratio, mix and stir evenly to make a positive electrode slurry, and then evenly coat the positive electrode slurry on the positive electrode current collector, and then dry, Cold pressing and cutting into pieces to...

Embodiment 1

[0030] (1) 2.3g of transition metal salt Mn(NO 3 ) 2 Dissolved in 50ml deionized water to form the first solution, 1.42g of cyanide salt Na 4 Fe(CN) 6 10H 2 O and 14gNaCl were dissolved in 100ml deionized water to form the second solution. Slowly add the first solution dropwise to the second solution under magnetic stirring at 70°C and continue to stir for 2h, then centrifuge and wash with deionized water three times. A white precipitate is obtained, and then the white precipitate is dried at 120°C for 8 hours to obtain the Prussian blue compound Na 2 MnFe(CN) 6 ;

[0031] (2) The positive electrode active material Na 2 MnFe(CN) 6 , positive electrode conductive agent Super-P, positive electrode binder PVDF (PVDF is pre-dissolved in NMP to make a concentration of 0.02gmL -1 solution) was placed in a small beaker at a mass ratio of 8:1:1, and then magnetically stirred for 4 hours to obtain a uniformly mixed positive electrode slurry, and then the positive electrode slur...

Embodiment 2

[0036] Prepare a rechargeable magnesium battery according to the method of Example 1, except for the following differences:

[0037] (4) The magnesium salt is BR 3 -(PhMgCl) 2 , R represents 3,5-xylyl.

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Abstract

The invention provides a rechargeable magnesium battery and a preparation method thereof. The rechargeable magnesium battery comprises a positive electrode tab, a negative electrode tab, an isolating membrane and an electrolyte, wherein the positive electrode tab comprises a positive current collector and a positive film; the positive film is arranged on the positive current collector and comprises a positive active material, a positive conductive agent and a positive binder; the negative electrode tab is magnesium metal foil or magnesium alloy foil; the isolating membrane is spaced between the positive electrode tab and the negative electrode tab; the positive active material is a Prussian blue compound with an open frame structure; and the electrolyte comprises a magnesium salt or a non-aqueous ether solvent. The rechargeable magnesium battery provided by the invention is high in working voltage, high in energy density, good in cycle performance, simple in production and preparation, low in cost, friendly to environment, safe and reliable.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a rechargeable magnesium battery and a preparation method thereof. Background technique [0002] At present, the practical rechargeable power battery systems mainly include: lead-acid batteries, nickel-metal hydride batteries and lithium-ion batteries, all of which play a huge role in people's daily life and social and economic development. Due to its low energy density and serious environmental pollution, lead-acid batteries will gradually withdraw from the stage of history. Ni-MH batteries have mature technology and good safety. In recent years, they have occupied the mainstream position of hybrid batteries, but their energy density is low, The cost is high, and its technological development is close to the limit at present. Lithium-ion batteries have the advantages of high energy density, high cycle life, and environmental protection, and have become a hot spot in current r...

Claims

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Application Information

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IPC IPC(8): H01M10/054
CPCY02E60/10
Inventor 郭永胜吴冰斌钟开富吴凯
Owner CONTEMPORARY AMPEREX TECH CO
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