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Preparation method of Ni/NiO/C composite material and supercapacitor

A technology of composite materials and mixtures, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., and can solve problems such as material deformation and weak conductivity of transition metal oxide materials

Active Publication Date: 2020-09-15
HUBEI UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to propose a preparation method of Ni / NiO / C composite material and supercapacitor, aiming to solve the problem of weak conductivity of transition metal oxide material and material deformation during charging and discharging

Method used

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  • Preparation method of Ni/NiO/C composite material and supercapacitor
  • Preparation method of Ni/NiO/C composite material and supercapacitor
  • Preparation method of Ni/NiO/C composite material and supercapacitor

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preparation example Construction

[0038] In view of this, the present invention proposes a method for preparing a Ni / NiO / C composite material, which can prepare a Ni / NiO / C composite material with good electrical conductivity and ease the volume change during charging and discharging. combine figure 1 The schematic flow sheet of an embodiment of the preparation method of proposed Ni / NiO / C composite material, the preparation method of described Ni / NiO / C composite material comprises the following steps:

[0039] Step S10, making the biomass raw material into biomass powder.

[0040] Specifically, the biomass is washed, dried, pulverized, and sieved to obtain biomass powder. Wherein, the drying temperature is 80-100° C., and the drying time is 10-12 hours; the sieving is 200-300 mesh sieves. In this embodiment, the biomass raw material is any one of waste biomass materials such as corncobs, peanut shells, straws, leaves, lotus pod shells, etc. The nutrient channels of these biomass raw materials are beneficial t...

Embodiment 1

[0057] Wash the corn cobs, dry them, crush them, and pass through a 300-mesh sieve to obtain corn cob powders; take 1 g of corn cob powders and immerse them in 8 mL of nickel chloride aqueous solution (molar concentration is 0.1 mol / L), soak for 72 hours, and then soak them at 120 Dry at ℃ for 4 hours; mix the dried corn cob powder with LiCl-KCl mixed salt (the molar fraction of LiCl is 0.58) (the mass ratio of corn cob powder and LiCl-KCl is 1:4) to obtain a mixture; Then put the mixture into N 2 In a tube furnace under the atmosphere, heat to 400°C, hold for 2 hours, heat to 650°C, hold for 5 minutes, cool to room temperature to obtain product A; wash product A with water at 60°C, pickle, wash with water, and dry to obtain The specific surface area is 1182m 2 / g and resistivity 3.1×10 -4 Ω.m Ni / NiO / C composite material.

Embodiment 2

[0059] Wash the rice straw, dry it, crush it, and pass it through a 200-mesh sieve to obtain the rice straw powder; take 1g of the rice straw powder and immerse it in 7mL of nickel chloride aqueous solution (molar concentration is 0.26mol / L), soak it for 24h, and then put it in 100 Dry at ℃ for 5 hours; mix the dried rice straw powder with LiCl-KCl mixed salt (the molar fraction of LiCl is 0.65) (the mass ratio of rice straw powder to LiCl-KCl is 1:3) to obtain a mixture; Then put the mixture into N 2 In a tube furnace under atmosphere, heat to 450°C, keep it warm for 1h, then heat to 510°C, keep it for 25min, cool to room temperature, and get product A; wash product A with water at 80°C, pickle, wash with water, and dry to get The specific surface area is 652m 2 / g and resistivity 2.4×10 -3 Ω.m Ni / NiO / C composite material.

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Abstract

The invention discloses a preparation method of a Ni / NiO / C composite material and a supercapacitor. The preparation method of the Ni / NiO / C composite material comprises the following steps: preparing biomass powder from a biomass raw material; immersing the biomass powder into a nickel ion solution to enable the biomass powder to adsorb nickel ions, and then drying the biomass powder which adsorbsthe nickel ions; uniformly mixing the dried biomass powder with inorganic salt to obtain a mixture; heating the mixture to T1 in an N2 atmosphere to melt inorganic salt in the mixture, keeping the temperature for 1-2 hours, then heating to 500-650 DEG C, keeping the temperature for 5-30 minutes, and cooling to room temperature to obtain a product A; washing the product A with water at 60-100 DEG C, and then pickling, washing and drying to obtain the Ni / NiO / C composite material. The Ni / NiO / C composite material prepared by the method is good in conductivity, the Ni / NiO / C composite material is used as an electrode material of the supercapacitor, the problem of stability caused by volume change in the NiO charging and discharging process is relieved, the electrochemical performance of the supercapacitor is improved, the cycling stability is relatively good, and the cycle life is long.

Description

technical field [0001] The invention relates to the technical field of supercapacitor electrode materials, in particular to a method for preparing a Ni / NiO / C composite material and a supercapacitor. Background technique [0002] Along with a large amount of portable equipments, as portable computer, mobile phone, walkman etc., popularize in daily life. The performance requirements of portable batteries are getting higher and higher. As an energy storage device that can store or release energy, supercapacitors are more and more popular because of their high energy density and power, good reversibility, no pollution to the environment, fast charge and discharge speed, and long cycle life. focus on. For supercapacitors, the quality of electrode materials is a key factor in determining the performance of supercapacitors. [0003] At present, the common supercapacitor electrode material is a transition metal oxide material, and the transition metal oxide is a pseudocapacitive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/42H01G11/44H01G11/46H01G11/86
CPCH01G11/42H01G11/44H01G11/46H01G11/86Y02E60/13
Inventor 肖作安袁晓庆余洪洋高星圆朱雨晴占丹蔡爽戴高鹏刘素芹胡学步
Owner HUBEI UNIV OF ARTS & SCI
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