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Preparation method of MnO2-coated Ni (OH) 2/NF capacitor electrode

A capacitor electrode and electrode technology, which is applied in the field of preparation of MnO2@Ni2/NF capacitor electrodes, can solve the problems of decreased energy storage performance, electrode structure damage, damaged structure, etc., and achieves excellent electrochemical energy storage, no attenuation of specific capacitance, The effect of increasing the specific surface area

Pending Publication Date: 2022-05-03
CHONGQING UNIV OF ARTS & SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A variety of transition metal oxides have been deeply studied as electrode materials for supercapacitors. In order to further improve performance, transition metal oxide materials with nanostructures have become a research hotspot in the field of supercapacitors. Nanostructures can not only serve as a catalyst for electrochemical reactions It provides more active sites and shortens the ion transmission path, but the nanostructured transition metal oxide material is not ideal as a supercapacitor electrode material. The specific capacitance value is far from the theoretical value and the experimental value. On the other hand , the charging and discharging process of the nanostructured transition metal oxide electrode will destroy its own structure due to the change of the electrode volume, which will eventually lead to the decline of the energy storage performance of the supercapacitor after multiple charging and discharging, and the cycle stability is not ideal. In addition, due to the transition of the nanostructure The metal oxide electrode is in the electrolyte for a long time, and the electrolyte is corrosive to a certain extent, which will also cause the structure of the electrode to be damaged, which will eventually lead to a decrease in charge and discharge performance and a greatly shortened service life

Method used

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  • Preparation method of MnO2-coated Ni (OH) 2/NF capacitor electrode
  • Preparation method of MnO2-coated Ni (OH) 2/NF capacitor electrode
  • Preparation method of MnO2-coated Ni (OH) 2/NF capacitor electrode

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Embodiment 1

[0035] A kind of MnO 2 @Ni(OH) 2 / NF capacitor electrode, made according to the following steps:

[0036] 1. MnO 2 @Ni(OH) 2 Preparation of / NF electrode:

[0037] (1) Raw material pretreatment:

[0038] Cut foam nickel (NF) into 3.5 × 1.5 cm rectangular pieces, then immerse in 25ml of hydrochloric acid solution with a volume fraction of 18%~25% for ultrasonic treatment for 25min, take it out, then place it in 50~80ml deionized water, and ultrasonicate for 45 minutes , and then place the treated NF in a blast drying oven, set the temperature at 55°C, dry for 22 hours, take it out, and set it aside;

[0039] (2) Ni(OH) 2 Preparation of / NF:

[0040] Put the NF treated in step (1) in a high-temperature hydrothermal kettle, add 45ml of deionized water, seal it and place it in an electric blast drying oven at 145°C, and react for 20 hours. After the reaction is completed, cool it down to room temperature naturally. Take out the reactant, put it in a constant temperature dr...

Embodiment 2

[0099] A kind of MnO 2 @Ni(OH) 2 / NF capacitor electrode, made according to the following steps:

[0100] 1. MnO 2 @Ni(OH) 2 Preparation of / NF electrode:

[0101] (1) Raw material pretreatment:

[0102] Cut the nickel foam (NF) into 3.5 × 1.5 cm rectangular pieces, then immerse in 20ml of hydrochloric acid solution with a volume fraction of 18% for ultrasonic treatment for 30 minutes, take it out, put it in 50ml of deionized water, ultrasonic for 30 minutes, and then process it The NF is placed in a blast drying oven, set at a temperature of 50°C, dried for 20 hours, taken out, and set aside;

[0103] (2) Ni(OH) 2 Preparation of / NF:

[0104] Put the NF treated in step (1) in a high-temperature hydrothermal kettle, add 40ml of deionized water, seal it and place it in an electric blast drying oven at 140°C, react for 18 hours, and when the reaction is complete, cool it down to room temperature naturally. Take out the reactant, place it in a constant temperature drying ...

Embodiment 3

[0115] A kind of MnO 2 @Ni(OH) 2 / NF capacitor electrode, made according to the following steps:

[0116] 1. MnO 2 @Ni(OH) 2 Preparation of / NF electrode:

[0117] (1) Raw material pretreatment:

[0118] Cut foam nickel (NF) into 3.5 × 1.5 cm rectangular pieces, then immerse in 30ml of hydrochloric acid solution with a volume fraction of 25% for ultrasonic treatment for 20 minutes, take it out, put it in 80ml deionized water, ultrasonic for 30 minutes, and then process it The NF is placed in a blast drying oven, set the temperature at 60°C, dried for 25 hours, taken out, and set aside;

[0119] (2) Ni(OH) 2 Preparation of / NF:

[0120] Put the NF treated in step (1) in a high-temperature hydrothermal kettle, add 42ml of deionized water, seal it and place it in an electric blast drying oven at 150°C, and react for 24 hours. After the reaction is completed, cool naturally to room temperature. Take out the reactant, put it in a constant temperature drying oven at 55°C, dr...

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Abstract

The preparation method of the MnO2 (at) Ni (OH) 2 / NF capacitor electrode comprises the steps of preparation of MnO2 (at) Ni (OH) 2 / NF, loading of MnO2 (at) Ni (OH) 2 / NF carbon quantum dots, wrapping of MnO2 (at) Ni (OH) 2 / NF tough materials loaded with the carbon quantum dots and the like. Wherein the tough material is prepared from sodium carboxymethyl cellulose, carboxy nitrile rubber, aluminum powder, 4-methylimidazole and deionized water. The MnO2 (at) Ni (OH) 2 / NF has a higher specific capacitance value, the specific capacitance can reach up to 1569F / g when 1A / g, the MnO2 (at) Ni (OH) 2 / NF electrode loaded with the carbon quantum dots is treated by a ductile material, the MnO2 (at) Ni (OH) 2 / NF electrode can adapt to the volume change in the charging and discharging process, meanwhile, the corrosion effect of an electrolyte can be prevented, and finally, the product is good in cycling stability and high in stability. Even if 10000 cycles of charging and discharging are carried out under the high current density of 10A / g, the specific capacitance is not attenuated, the retention rate is 99.1% of the initial value, the electrochemical energy storage is excellent, and the material is worthy of market popularization.

Description

technical field [0001] The invention belongs to the technical field of energy storage, in particular to a MnO 2 @Ni(OH) 2 The preparation method of / NF capacitance electrode. Background technique [0002] A supercapacitor is a power supply with special properties between traditional capacitors and batteries. It mainly relies on electric double layers and redox pseudocapacitive charges to store electrical energy. However, no chemical reaction occurs in the process of its energy storage. This energy storage process is reversible, and it is precisely because this supercapacitor can be repeatedly charged and discharged tens of thousands of times. The characteristics of high specific power, high current charge and discharge capacity, ultra-low temperature performance, high reliability, and green environmental protection make supercapacitors have great potential as power sources or energy storage sources in many fields such as transportation, renewable energy, industrial electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/46H01G11/24
CPCH01G11/86H01G11/46H01G11/24
Inventor 陈文波田亮亮伍沈平王毅杨文耀陈道定
Owner CHONGQING UNIV OF ARTS & SCI
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