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Antimony-doped tin dioxide coated porous manganese dioxide composite electrode material and preparation

A tin dioxide and manganese dioxide technology, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of high temperature calcination, unstable structure, complicated process, etc., to improve cycle stability and active material utilization rate, improve utilization rate , the effect of increasing the specific capacity

Inactive Publication Date: 2014-05-21
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently about MnO 2 Electrode material modification research mainly focuses on improving MnO 2 conductivity and specific surface area, aiming at improving MnO 2 There are not many studies on the cycle stability of electrodes, and only reports have been made on the uniform coating of conductive polymers on MnO 2 surface, using a conductive polymer film as the MnO 2 A barrier in direct contact with the electrolyte thus preventing the MnO 2 Dissolution, but the conductive polymer film coating process is complicated, the structure is unstable, and high-temperature calcination cannot be performed

Method used

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  • Antimony-doped tin dioxide coated porous manganese dioxide composite electrode material and preparation
  • Antimony-doped tin dioxide coated porous manganese dioxide composite electrode material and preparation
  • Antimony-doped tin dioxide coated porous manganese dioxide composite electrode material and preparation

Examples

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Embodiment 1

[0019] Prepare water-ethylene glycol (H 2 O:C 2 h 6 o 2 =9:1) Mix 100mL of the solution, heat up to 30°C, add 1g of PVP, stir well to dissolve. Add 1.69g of MnSO 4 .H2 O solid, stirred to dissolve. Continue magnetic stirring, add 12.5mL of 1mol / L Na 2 CO 3 The aqueous solution was slowly added dropwise to the MnSO 4 In the solution, the stirring reaction was continued at 30° C. for 2 h, and a milky white precipitate a was formed, which was allowed to stand at room temperature for 3 h. The white precipitate a was centrifuged (3500r / min, 5min), washed with ethanol and deionized water respectively until the supernatant was neutral. Dry a in air at 60°C for 2.5h to obtain MnCO 3 particle. SEM image ( figure 1 ) shows that the prepared MnCO 3 The particle size is 400-550nm, and the distribution is uniform.

[0020] Prepare a water-ethanol solution (C 2 h 6 O:H 2 O=7:1) 40mL, weigh 0.35g (1mmol) of SnCl 4 .5H 2 O and 0.009 g (0.04 mmol) of SbCl 3 Dissolve in the m...

Embodiment 2

[0023] MnCO 3 Particle preparation is the same as Step 1 of Example 1. Prepare a water-ethanol solution (C 2 h 6 O:H 2 O=6:2) 20mL, weigh 0.175g (0.5mmol) of SnCl 4 .5H 2 O and 0.0069 g (0.03 mmol) of SbCl 3 Dissolve in the mixed solution and stir for 40 minutes at 27°C to make it into a sol. Weigh 0.575g (5mmol) MnCO 3 Add it into the sol, sonicate for 1 hour, and react with magnetic stirring at 35°C for 2.5 hours to make it gel. Cool to room temperature, stand at room temperature for 24h, centrifuge (3500r / min, 5min), dry in 55°C air atmosphere for 3h, put into tube resistance furnace, in air atmosphere, at a heating rate of 2.5°C / min The temperature was raised to 400° C., and then calcined at a constant temperature of 400° C. for 2.5 hours to obtain an antimony-doped tin dioxide-coated porous manganese dioxide composite electrode material. Characterize the prepared material, the SEM image shows that the particle size of the prepared material is 400nm-600nm, and the...

Embodiment 3

[0025] MnCO 3 Particle preparation is the same as Step 1 of Example 1. Prepare a water-ethanol solution (C 2 h 6 O:H 2 O=6.5:1.5) 40mL, weigh 0.525g (1.5mmol) of SnCl 4 .5H 2 O and 0.021 g (0.09 mmol) of SbCl 3 Dissolve in the mixed solution, stir at 35°C for 0.5h to make it into a sol. Weigh 1.15g (10mmol) MnCO 3 Add it into the sol, sonicate for 2 hours, and react with magnetic stirring at 40°C for 3.5 hours to make it gel. Cool to room temperature, stand at room temperature for 15h, centrifuge (3500r / min, 5min), dry in 65°C air atmosphere for 2h, put into tube resistance furnace, in air atmosphere, at a heating rate of 2.67°C / min The temperature was raised to 450° C., and then calcined at a constant temperature of 450° C. for 3 hours to obtain the antimony-doped tin dioxide-coated porous manganese dioxide composite electrode material. Characterize the prepared material, the SEM image shows that the particle size of the prepared material is 400nm-600nm, and the surf...

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Abstract

The invention discloses an antimony-doped tin dioxide coated porous manganese dioxide composite electrode material and a preparation method. The composite material is of a core-shell structure, the average particle size of the composite material is 400-600nm, an antimony-doped tin dioxide coated layer is arranged on an outer layer, a core is a porous manganese dioxide spherical particle, the molar ratio of manganese to tin in the composite material is 100: (5-20), and the molar ratio of the tin to antimony is 100: (2-6). The preparation method includes the steps: reacting sodium carbonate and manganese sulfate to obtain manganese carbonate; dissolving tin tetrachloride and antimony trichloride in ethanol water solution to prepare sol; adding the manganese carbonate into the sol; preparing an antimony-doped tin dioxide coated manganese carbonate composite material; calcining the obtained composite material to prepare the antimony-doped tin dioxide coated porous manganese dioxide composite electrode material. The preparation method is simple, and the obtained electrode material is high in specific capacity and fine in cycling stability and can serve as a novel super-capacitor electrode material.

Description

technical field [0001] The invention relates to an antimony-doped tin dioxide-coated porous manganese dioxide composite electrode material and a preparation method, belonging to the technical field of capacitor electrode materials. Background technique [0002] With economic development, the world is facing severe challenges of energy crisis and environmental pollution. Therefore, it is urgent for us to develop non-polluting, sustainable and efficient new energy sources and new energy storage devices to meet the needs of future global economic development. In the past ten years, due to the advantages of high power density, long cycle life, short charging time, environmental protection and safety, supercapacitors have received extensive attention, and have been widely used in electric vehicles, hybrid electric vehicles, fuel cell carriers, uninterruptible power supply systems, And mobile phones and many other fields. Especially in recent years, many countries, including Chi...

Claims

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Application Information

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IPC IPC(8): H01G11/46
CPCY02E60/13
Inventor 张裕卿莫妍
Owner TIANJIN UNIV
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