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Universal electrochemical modification preparation method for effectively enhancing electricity storage performance of various transition metal oxides

A transition metal and oxide technology, applied in the field of universal electrochemical modification preparation, can solve the problems of inability to realize electrochemical activation, increase material production cost, low power density, etc., and achieve enhanced rate performance and cycle stability, The effect of improving and enhancing energy storage performance

Inactive Publication Date: 2021-03-09
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the currently widely used lithium-ion batteries still have disadvantages, such as low power density, safety hazards, high cost, and insufficient lifespan.
However, the long-term CV cycle and the use of high-concentration electrolyte will increase the production cost of the material, and this method still cannot achieve the electrochemical activation of other transition metal oxide materials.

Method used

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  • Universal electrochemical modification preparation method for effectively enhancing electricity storage performance of various transition metal oxides
  • Universal electrochemical modification preparation method for effectively enhancing electricity storage performance of various transition metal oxides
  • Universal electrochemical modification preparation method for effectively enhancing electricity storage performance of various transition metal oxides

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Embodiment 1

[0031] Embodiment 1: A method for preparing electrochemically activated nickel cobalt oxide (NiCoO) nanowire arrays, comprising the following steps: preparing nickel cobalt oxide nanowire arrays (NiCoO NWAs) through a simple hydrothermal reaction and air annealing process. First, 10 mM nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O,AR), 20mM cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O,AR) and 20mM urea (CO(NH 2 ) 2 , AR) dissolved in 15mL ultrapure water (18.2MΩ.cm) to form a homogeneous solution. The solution was then transferred to a 20 mL Teflon-lined steel autoclave, and then immersed in a piece of nickel foam (1 × 4 cm 2 ), nickel foam was pre-cleaned with 0.1M hydrochloric acid, acetone, ethanol and deionized water. After being maintained in an oven at 120° C. for 10 hours, the autoclave was taken out to cool naturally. Remove the final product, sonicate for 2 minutes in deionized water, and rinse with copious amounts of deionized water to remove loose part...

Embodiment 2

[0032] Embodiment 2: a kind of method that is used to prepare electrochemically activated NiCoO nanosheet array comprises the following steps: 1) first prepare nickel-cobalt double metal hydroxide, under magnetic stirring, the 2-methylimidazole (MIM of 40mM ) methanol solution was added to another solution containing 10mM Ni(NO 3 ) 2 ·6H 2 O and 10mM Co(NO 3 ) 2 ·6H 2 O in methanol solution. On this basis, the reaction solution was put into a tetrafluoroethylene-lined stainless steel reaction kettle, and a piece of pre-cleaned carbon fiber cloth growth substrate (CFC, 1 × 4 cm 2 ), the solvothermal reaction was carried out at 140°C for 14h, and the sample was rinsed with methanol after the reaction, and dried in an air oven at 70°C. 2) Then prepare nickel-cobalt oxide, put the dried sample into a tube furnace, and anneal at 350°C for 30min in air, with a programmed temperature rise rate of 5°Cmin -1 , to obtain NiCoO nanosheet arrays. 3) Finally, the electrochemical ac...

Embodiment 3

[0033] Embodiment 3: a kind of method for preparing electrochemically activated zinc cobaltate (ZnCoO) nanowire array comprises the following steps: 1) using 25mM zinc nitrate hexahydrate (Zn(NO 3 ) 2 ·6H 2 O,AR) and 25mM cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O, AR) as the metal cation precursor, using 15 mM NH 4 F and 25mM CO(NH 2 ) 2 As the alkali source, pour the solution containing the alkali source into the solution containing metal ions, and stir evenly for 10 minutes. The reaction solution was then transferred to a 20 mL Teflon-lined steel autoclave while immersed in a nickel foam substrate (1 × 4 cm 2 ), nickel foam was pre-cleaned with 0.1M hydrochloric acid, acetone, ethanol and deionized water. After being maintained in an oven at 120° C. for 10 hours, the autoclave was taken out to cool naturally. 2) Take out the nickel foam, rinse it three times with ultrapure water, put it into a vacuum drying oven, and dry it at 70°C for 8 hours. Finally, the p...

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Abstract

The invention relates to a universal electrochemical modification preparation method for effectively enhancing the electricity storage performance of various transition metal oxides, and belongs to the technical field of production of super capacitors and alkaline secondary battery electrodes. The method is characterized in that cyclic voltammetry curve scanning under a wide voltage window is carried out on transition metal oxide electrode materials (including cobalt oxide, nickel cobaltate, manganese cobaltate, zinc cobaltate, cobalt-nickel-zinc oxide and the like) in the alkaline electrolyteby utilizing an electrochemical workstation, so that the electrochemical activity of the electrode materials is greatly improved, and then a high-performance super capacitor and an alkaline water system secondary battery are prepared. According to the invention, a simple electrochemical activation method is adopted, the equipment is simple, the operation is simple, the reaction is rapid, the costis low, the method can be simultaneously used for modifying various materials, the energy storage performance can be improved by more than 5 times, and the universality is strong.

Description

technical field [0001] The invention belongs to the technical field of production of supercapacitors and alkaline secondary battery electrodes, and relates to a universal electrochemical modification preparation method for effectively enhancing the electricity storage performance of various transition metal oxides. Background technique [0002] Energy is the material basis for human survival and sustainable social and economic development. Since the 21st century, with the continuous growth of population, the consumption of non-renewable fossil energy such as coal, oil, and natural gas has further increased, which will eventually cause a global energy crisis. At the same time, the combustion of these fossil fuels will produce a large amount of toxic, harmful and greenhouse gases, etc., causing serious environmental pollution problems. Therefore, the active development of renewable clean energy and its efficient conversion, storage, and utilization become the key to solving t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/50H01M4/52H01M10/24H01G11/46H01G11/86
CPCH01M4/131H01M4/1391H01M4/50H01M4/52H01M10/24H01G11/46H01G11/86Y02E60/10Y02E60/13
Inventor 王腾陈凯杰王友
Owner NORTHWESTERN POLYTECHNICAL UNIV
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