Method for preparing capacitor electrode material non-stoichiometric lanthanum manganate

A technology for stoichiometric lanthanum manganate and electrode materials, applied in hybrid capacitor electrodes, nanotechnology for materials and surface science, manganate/permanganate, etc. Time and other issues, to achieve the effect of low cost, good material performance, high cycle stability

Inactive Publication Date: 2017-09-05
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However the above increases the LaMnO 3 The method of conductivity is not only complicated to prepare, but also expensive and time-consuming

Method used

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  • Method for preparing capacitor electrode material non-stoichiometric lanthanum manganate
  • Method for preparing capacitor electrode material non-stoichiometric lanthanum manganate
  • Method for preparing capacitor electrode material non-stoichiometric lanthanum manganate

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Weigh 26.846g of lanthanum nitrate hexahydrate and add it to 20mL of water under the action of magnetic stirring. Then, 12.2044 g of manganese nitrate (Mn / La molar ratio=1.1) was weighed and added to the above solution, and stirred for 2 h to ensure that a homogeneously mixed nitrate mixture was obtained. Then 10.4 mL of citric acid (15.5 mol / L) was added dropwise.

[0027] (2) The above mixed solution was placed in a water bath at 80°C, vigorously stirred for 4 hours, and the excess water was evaporated until a brown gel was obtained. The obtained sol-gel was transferred to a vacuum drying oven and dried at 140 °C for 8 h.

[0028] (3) The xerogel obtained in the above steps was put into an agate mortar and ground, then transferred to a tube furnace, and preheated to 350° C. for 10 minutes. The burnt powder was ground and calcined at 750°C for 4h in a tube furnace in an air atmosphere. Get LaMn 1.1 O 3 .

Embodiment 2

[0030] (1) Weigh 26.846g of lanthanum nitrate hexahydrate and add it to 20mL of water under the action of magnetic stirring. Then, 11.6496 g of manganese nitrate (Mn / La molar ratio=1.05) was weighed and added to the above solution, and stirred for 2 h to ensure that a uniformly mixed nitrate mixture was obtained. Then 10.2 mL of citric acid (15.5 mol / L) was added dropwise.

[0031] (2) The above mixed solution was placed in a water bath at 80°C, vigorously stirred for 4 hours, and the excess water was evaporated until a brown gel was obtained. The obtained sol-gel was transferred to a vacuum drying oven and dried at 140 °C for 8 h.

[0032] (3) The xerogel obtained in the above steps was put into an agate mortar and ground, then transferred to a tube furnace, and preheated to 350° C. for 10 minutes. The burnt powder was ground and calcined at 750°C for 4h in a tube furnace in an air atmosphere. Get LaMn 1.05 O 3 .

Embodiment 3

[0034] (1) Weigh 26.846g of lanthanum nitrate hexahydrate and add it to 20mL of water under the action of magnetic stirring. Then, 11.0949 g of manganese nitrate (Mn / La molar ratio=1.00) was weighed and added to the above solution, and stirred for 2 h to ensure that a homogeneously mixed nitrate mixture was obtained. Then 10.0 mL of citric acid (15.5 mol / L) was added dropwise.

[0035] (2) The above mixed solution was placed in a water bath at 80°C, vigorously stirred for 4 hours, and the excess water was evaporated until a brown gel was obtained. The obtained sol-gel was transferred to a vacuum drying oven and dried at 140 °C for 8 h.

[0036] (3) The xerogel obtained in the above steps was put into an agate mortar and ground, then transferred to a tube furnace, and preheated to 350° C. for 10 minutes. The burnt powder was ground and calcined at 750°C for 4h in a tube furnace in an air atmosphere. Get LaMnO 3 .

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Abstract

The invention discloses a method for preparing a capacitor electrode material non-stoichiometric lanthanum manganate (LaMnx+ / -1O3). The method comprises the following steps: mixing nitrate of manganese and lanthanum according to a certain ratio, and stirring to obtain sol; drying to obtain dried gel; and finally, performing calcination treatment, thereby obtaining the non-stoichiometric LaMnx+ / -1O3. The product disclosed by the invention is of a porous structure and has a large specific surface area, and energy density is improved; and the LaMnx+ / -1O3 has relatively high oxygen vacancy concentration, and the transport speed of ions and electrons is improved, so that the power density is enhanced. Compared with stoichiometric lanthanum manganate (LaMnO3), the LaMnx+ / -1O3 has high capacity and cycling stability when serving as a super-capacitor electrode material. When the scanning rate is 0.5A / g, the specific capacitance of LaMn1.1O3 is 508F / g. When the current density is 3A / g, the capacity is kept at 75% due to 1000-time cycle, and the specific capacitance is finally stabilized at about 250F / g.

Description

technical field [0001] The invention relates to non-stoichiometric LaMn as a high-performance capacitor electrode material x±1 O 3 The preparation method belongs to the field of supercapacitor electrode material preparation. Background technique [0002] Due to their remarkable power density, cycle life, and charge / discharge rate, supercapacitors are widely used in devices that require instantaneous high currents, such as digital cameras, solar warning lights, and electric vehicles. However, supercapacitors suffer from low energy density compared to lithium-ion batteries. Therefore, the current problem to be solved is to improve the energy density and power density of supercapacitors. [0003] At present, research on supercapacitor electrode materials mainly focuses on carbon materials, metal oxide nanoparticles and conductive polymers. Metal oxides have attracted increasing attention in recent years due to the pseudocapacitance effect. Among the metal oxides, the oxide...

Claims

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Application Information

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IPC IPC(8): C01G45/12H01G11/46B82Y30/00
CPCY02E60/13C01G45/12B82Y30/00C01P2004/04C01P2004/64H01G11/46
Inventor 陈坚王丹伊乐可徐晖
Owner SOUTHEAST UNIV
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