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Method for preparing environment-friendly renewable zinc ion supercapacitor based on urban tree fallen leaves

A technology of supercapacitors and zinc ions, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc., can solve the problems of limiting the energy density of zinc ion supercapacitors, and is suitable for industrial production, less time-consuming, and repeatable. high effect

Active Publication Date: 2021-10-08
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the development of Zn-ion supercapacitors is still in its infancy, and there are many bottlenecks to be overcome
In particular, challenges arising from the limited ion adsorption capacity of carbon cathode materials severely limit the energy density of Zn-ion supercapacitors.

Method used

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  • Method for preparing environment-friendly renewable zinc ion supercapacitor based on urban tree fallen leaves
  • Method for preparing environment-friendly renewable zinc ion supercapacitor based on urban tree fallen leaves
  • Method for preparing environment-friendly renewable zinc ion supercapacitor based on urban tree fallen leaves

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Effect test

Embodiment 1

[0031] The method for preparing an environmentally friendly and renewable zinc-ion supercapacitor based on the chemical treatment of fallen leaves of urban sycamore trees in this embodiment, the steps are as follows:

[0032] (1) Pulverize the fallen leaves of the sycamore tree, and then use the concentrated sulfuric acid, concentrated hydrochloric acid and concentrated phosphoric acid with a mass ratio of 1:1:1 to pretreat and grade the fallen leaves of the sycamore tree in powder form to obtain lignin and cellulose. The specific operation process is as follows: Weigh 15 grams of sycamore leaves and put them into a 500mL flask, add a certain amount of concentrated sulfuric acid, concentrated hydrochloric acid, concentrated phosphoric acid and ethylene glycol with a mass ratio of 1:1:1, and put them under normal pressure at 50°C. React for a certain period of time. After the reaction is completed, the product is subjected to suction filtration and washed with distilled water un...

Embodiment 2

[0038] The method for preparing an environmentally friendly and renewable zinc ion supercapacitor based on the chemical treatment of urban ginkgo leaves in this embodiment is as follows:

[0039](1) Pulverize the urban ginkgo fallen leaves, and then carry out pretreatment and graded extraction of the powdered urban ginkgo fallen leaves with 3M sodium hydroxide, 2M lithium hydroxide and 3M potassium hydroxide aqueous solution with a mass ratio of 1:1:1, Obtain lignin and cellulose; at the same time, carbonize the crushed urban ginkgo leaves at 200 and 600°C for 2 hours and 8 hours to obtain biochar;

[0040] (2) The obtained biochar is used to prepare the positive electrode and the negative electrode of the zinc ion supercapacitor; the obtained lignin and cellulose are used to prepare the zinc ion supercapacitor gel electrolyte, and the mass ratio of cellulose to zinc chloride is 50:1; The mass ratio of lignin to zinc chloride is 50:1;

[0041] (3) Assemble the obtained biocha...

Embodiment 3

[0045] The method for preparing an environmentally friendly and renewable zinc-ion supercapacitor based on the chemical treatment of urban eucalyptus leaves in this embodiment is as follows:

[0046] (1) Pulverize the fallen leaves of the urban eucalyptus, and then use concentrated sulfuric acid and concentrated phosphoric acid with a mass ratio of 1:1 to carry out pretreatment and graded extraction of the powdered urban eucalyptus fallen leaves to obtain lignin and cellulose; at the same time, the pulverized Urban eucalyptus leaves were carbonized step by step at 500 and 1200°C for 0.5 hour and 1 hour to obtain biochar;

[0047] (2) The obtained biochar is used to prepare the positive electrode and the negative electrode of the zinc ion supercapacitor; the obtained lignin and cellulose are used to prepare the zinc ion supercapacitor gel electrolyte, and the mass ratio of cellulose to zinc chloride is 25:1; The mass ratio of lignin to zinc chloride is 10:1;

[0048] (3) Assem...

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Abstract

The invention relates to a method for preparing an environment-friendly renewable zinc ion supercapacitor based on urban tree fallen leaves, and the method comprises the steps: treating the urban tree fallen leaves to obtain lignin, cellulose and biochar with different functions; and further preparing a gel electrolyte for the zinc ion supercapacitor based on lignin, cellulose and biochar, a biochar positive electrode and a biochar negative electrode, and finally obtaining the zinc ion supercapacitor with environment-friendly and renewable functions. According to the method, the problems of economic cost and cyclic utilization in conventional preparation of the electrode material and electrolyte of the zinc ion supercapacitor are solved, and the zinc ion supercapacitor which is 100% environmentally friendly and renewable is obtained. The specific capacity of the prepared zinc ion supercapacitor is higher than 160mAhg<-1>, the rate capability is good, and the cycle performance is excellent. The method can start from urban tree fallen leaves which are low in price and easy to obtain, is prepared through a process which is high in repeatability, simple in process and low in time consumption, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to a method for preparing an environmentally friendly and renewable zinc ion supercapacitor based on the chemical treatment of fallen leaves of urban trees. Background technique [0002] Zn-ion supercapacitors, which combine the advantages of high-energy Zn-ion batteries and high-power capacitors, have attracted increasing attention as promising energy storage devices in recent years. However, the development of Zn-ion supercapacitors is still in its infancy, and there are many bottlenecks to be overcome. In particular, challenges arising from the limited ion adsorption capacity of carbon cathode materials severely limit the energy density of Zn-ion supercapacitors. Therefore, it has become a critical issue to design novel carbon cathodes that can achieve high energy density without compromising intrinsic power capability and long-term durability. [0003] At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/44H01G11/84
CPCH01G11/84H01G11/44Y02E60/13
Inventor 王诗文丁军伟张航方少明吴诗德姬东方曹小玉冯朴赖智龙高可政王恒郭东杰
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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