A class of layered perovskite nano-oxide electrode materials for supercapacitors

A technology of supercapacitors and nano-oxides, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of low specific capacitance and low specific energy density of supercapacitors

Active Publication Date: 2020-10-30
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

While Sr-doped LaMnO 3-δ Although the voltage window is as high as about 2.0V, the specific capacitance can only reach 230F / g, (X.W.Wang et al.Journal of Alloys and Compounds2016,675,195-200)
[0005] We note that these reported ABOs 3 The electrochemical properties of oxide supercapacitor electrode materials with perovskite structure often show high specific capacitance and small window voltage, or when the window voltage is large, the specific capacitance is not very high, resulting in supercapacitor The final specific energy density of the capacitor is not very large

Method used

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Embodiment 1

[0027] Embodiment 1 (La 0.85 Sr 1.15 )MnO 4 supercapacitor material

[0028] Prepared by sol-gel method (La 0.85 Sr 1.15 )MnO 4 . The process steps are as follows: use nitrates of various metal ions as raw materials to prepare La(NO 3 ) 3 , Sr(NO 3 ) 2 and Mn(NO 3 ) 2 aqueous solution, first pipette the La(NO 3 ) 3 Solution 17mL, Sr(NO 3 ) 2 Solution 23mL, Mn(NO 3 ) 2 Put 20mL of the solution into a 250mL beaker, and add 0.12mol of citric acid to the beaker. Then add methanol to the beaker to dilute the solution by 100mL, stir until completely dissolved and then add 6mL of ethylene glycol. Then, the solution was moved into a water bath at 88°C, heated with stirring, and a uniform and transparent sol was formed for 55 minutes, and the sol was transferred into an oven at 180°C for heat treatment for 20 hours to form a xerogel precursor. Grind the dry gel precursor and transfer it to a tube furnace. In an oxygen atmosphere, first keep it at 200°C for 30 minutes...

Embodiment 2

[0031] Embodiment 2 (La 1.67 Sr 0.33 )NiO 4 supercapacitor material

[0032] Prepared by sol-gel method (La 1.67 Sr 0.33 )NiO 4 . The process steps are as follows: use nitrates of various metal ions as raw materials to prepare La(NO 3 ) 3 , Sr(NO 3 ) 2 and Ni(NO 3 ) 2 aqueous solution, first pipette the La(NO 3 ) 3 Solution 33.4mL, Sr(NO 3 ) 2 Solution 6.6mL, Ni(NO 3 ) 2Put 20mL of the solution into a 250mL beaker, and add 0.12mol of citric acid to the beaker. Then add methanol to the beaker to dilute the solution by 100mL, stir until completely dissolved and then add 6mL of ethylene glycol. Then, the solution was moved into a water bath at 88°C, heated with stirring, and a uniform and transparent sol was formed for 55 minutes, and the sol was transferred into an oven at 180°C for heat treatment for 20 hours to form a xerogel precursor. Grind the dry gel precursor and transfer it to a tube furnace. In an oxygen atmosphere, first keep it at 200°C for 30 minut...

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Abstract

The invention relates to a supercapacitor electrode material of a laminated perovskite type nanometer oxide. The material has an iron / manganese / cobalt / nickelate doped oxide nanometer material of a 214type laminated perovskite structure with a chemical formula of L2-xXxMO4-delta, the iron / manganese / cobalt / nickelate doped oxide nanometer material of the laminated perovskite structure carrying Ag, and the iron / manganese / cobalt / nickelate doped oxide nanometer material of the laminated perovskite structure in which graphene is combined. In the chemical formula, L is one or mixture of trivalent rare earth metal ions including La, Pr, Nd and Sm, X is the one or mixture of divalent metal ions of Mg, Ca, Sr, Ba and Pb, M is one or mixture of Fe, Mn, Co and Ni, and x is not less than 0 and not morethan 2, and delta is not more than 1 and not less than -1. The iron / manganese / cobalt / nickelate doped perovskite structure oxide of the laminated perovskite structure comprises nanometer powder with grain size of 10-100nm, film with thickness of 50-1000nm, and nanometer fibers with diameters of 100-500nm and lengths of 500-5000nm.

Description

Technical field: [0001] The invention relates to a class of layered perovskite-type nano-oxide supercapacitor electrode materials, in particular layered perovskite-structure doped iron / manganese / cobalt / nickelate oxide nanomaterials with good electrochemical properties The invention relates to an application in a supercapacitor and belongs to the field of supercapacitors. Background technique: [0002] A supercapacitor is a new type of power supply device, also known as an electrochemical capacitor. It is a capacitor that stores energy through an electrochemical process at the electrode / solution interface. Due to the supercapacitor's high power density, long cycle life, and fast charge and discharge speed, With the advantages of wide operating temperature range, safety and environmental protection, it has become an important part of the new energy application field. Supercapacitors can be regarded as an energy device between physical capacitors and secondary batteries, howev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/26H01G11/46
CPCH01G11/26H01G11/46Y02E60/13
Inventor 熊飞胡万彪郭长金王立凡毕晓伊
Owner YUNNAN UNIV
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