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Manganese tungstate electrode material and preparation method thereof

An electrode material, the technology of manganese tungstate, applied in the direction of circuits, capacitors, electrical components, etc., can solve the problems of difficult to meet industrial applications, cumbersome preparation process, narrow particle size distribution, etc., to achieve easy control of preparation parameters, simple process, The effect of uniform particle distribution

Inactive Publication Date: 2012-09-12
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a member of manganese-based composite oxide materials, manganese tungstate has multiferroic properties and has important applications in many fields such as data storage and information transmission. However, there are very few international reports on its application as an electrode material in ES, and there is no domestic report. See the report, and the specific capacitance is particularly low (-1 ), the particle size distribution is narrow, the preparation process is extremely cumbersome, and it is difficult to meet the requirements of industrial applications

Method used

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  • Manganese tungstate electrode material and preparation method thereof
  • Manganese tungstate electrode material and preparation method thereof
  • Manganese tungstate electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035] Using manganese sulfate and sodium tungstate as starting materials and citric acid as additive, dissolve them in deionized water to prepare a solution with manganese salt concentration and tungstate concentration of 0.21M, and the additive concentration is 0.75M; Stoichiometric ratio Measure a certain amount of manganese salt and tungstate solution and mix and stir for 1 hour to obtain an emulsion; under magnetic stirring, add the additive dropwise to the above emulsion to adjust its pH to 2; Put the emulsion into a hydrothermal kettle for heat treatment, control the temperature at 100°C, and react continuously for 16 hours, and then separate the reacted solution to obtain a precipitate; wash the obtained precipitate with deionized water several times, and heat it at 50°C After drying for 4 hours, the target product can be obtained, which can be used as a supercapacitor electrode material. The plasma emission spectrum of the synthesized material shows that the actual co...

Embodiment 2

[0037] Using manganese chloride and sodium tungstate as starting materials and sodium hydroxide as additive, dissolve them in deionized water to make a solution with manganese salt concentration and tungstate concentration of 1M, and the additive concentration is 2.5M; massage According to the stoichiometric ratio, measure a certain amount of manganese salt and tungstate solution and mix and stir for 3 hours to obtain an emulsion; under magnetic stirring, add the additive dropwise to the above emulsion to adjust its pH to 12; The emulsion is put into a hydrothermal kettle for heat treatment, the temperature is controlled at 160°C, and the reaction is continued for 48 hours, and then the reacted solution is separated to obtain a precipitate; the obtained precipitate is washed several times with deionized water, and the After drying at ℃ for 4 hours, the target product can be obtained, which can be used as a supercapacitor electrode material. Image 6 For the X-ray diffraction s...

Embodiment 3

[0039] Using manganese nitrate and ammonium tungstate as starting materials and ammonia water as additive, dissolve them in deionized water to prepare a solution with manganese salt concentration and tungstate concentration of 0.46M, and the additive concentration is 0.5M; Metering ratio Measure a certain amount of manganese salt and tungstate solution and mix and stir for 12 hours to obtain an emulsion; under magnetic stirring, add the additive dropwise to the above emulsion to adjust its pH to 8; Put the turbid liquid into a hydrothermal kettle for heat treatment, control the temperature at 140°C, and react continuously for 24 hours, then separate the reacted solution to obtain a precipitate; wash the obtained precipitate with deionized water several times, and dry at 100°C After 2 hours, the target product can be obtained, which can be used as a supercapacitor electrode material. The X-ray diffraction analysis results show that its phase is manganese tungstate (P2 / c) with m...

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Abstract

The invention relates to a manganese tungstate electrode material and a preparation method thereof. A primary particle of the electrode material has a nanometer particle structure and a controllable particle size of 5 to 500 nm. A manganese tungstate super-capacitor electrode material which is prepared by the method has specific capacitance of more than 153 F.g<-1>. Compared with the conventional preparation method, the preparation method has the advantages of operability, practical process, high reproducibility, low cost, high material purity, high electrochemical performance and the like.

Description

technical field [0001] The invention relates to a manganese tungstate electrode material with controllable particle size and a preparation method thereof in the field of supercapacitors. Background technique [0002] In recent years, electrochemical supercapacitors (ES) have attracted extensive attention. Compared with secondary battery devices, this type of capacitor has the characteristics of high power density and long cycle life (up to unlimited times), and has higher energy density than traditional capacitors, covering almost all fields of battery applications, from portable electronics to Devices, energy storage for backup systems, hybrid electric vehicles, and industrial-scale power and energy facilities. The US Department of Energy has placed ES research on energy storage devices at the same level as secondary batteries. Immediately afterwards, governments and companies of various countries have invested a lot of manpower, material resources, and financial resource...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042
Inventor 李莉萍赵明磊李广社
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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