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Preparing method of composite electrode material and application thereof

A composite electrode and electrode sheet technology, which is applied in the directions of hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, battery electrodes, etc., can solve the problems of troublesome use, high commercialization cost, poor conductivity, etc. Good, reduce the effect of commercialization cost

Active Publication Date: 2017-01-18
CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of poor electrical conductivity, high commercialization cost, and troublesome use of the composite electrode material prepared by the prior art, and provide a preparation method and application of the composite electrode material; The polypyrrole gel doped with phytic acid formed by body, phytic acid and ammonium persulfate was directly coated on the hydrogenated P25 type TiO 2 On the surface of the granular material, single-walled carbon nanotubes are used as the skeleton to form a composite electrode material with a three-dimensional network structure. The composite electrode material not only has good electrical conductivity, high initial charge and discharge capacity, and good rate performance and cycle performance. , at the same time, when the composite electrode material is applied to supercapacitors, there is no need to add conductive agents and binders, which reduces commercialization costs and is more convenient to use, which is conducive to the commercialization of secondary chemical power sources

Method used

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  • Preparing method of composite electrode material and application thereof
  • Preparing method of composite electrode material and application thereof
  • Preparing method of composite electrode material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Hydrogenation treatment: P25 type TiO 2 The powder sample was heat-treated in a vacuum reactor at 300°C in an argon atmosphere for 30 minutes to remove impurities on the surface and lowered to room temperature; 2 In the atmosphere, the temperature was raised to 300-650°C (interval 50°C) at 5°C / min and then kept for 3 hours to obtain H-TiO with different contents of oxygen vacancy defects 2 ;

[0037] 2. Electrode sheet preparation: H-TiO under different temperature treatments 2 : Acetylene black: PVDF=8:1:1 Grinding fully and uniformly coated on the surface of copper foil and drying at 120°C; then cut into 16*16mm electrode sheets and assembled with lithium sheets in an argon-filled glove box to form a half-cell , to test and compare the electrochemical performance at different treatment temperatures.

[0038] Different treatment temperature ℃ Specific capacity (0.1C after 20 cycles) mAh / g raw material 76 300 82 400 125 450 127 ...

Embodiment 2

[0041] 1. Hydrogenation treatment: P25 type TiO 2 The powder sample was heat-treated in a vacuum reactor at 300 °C in an argon atmosphere for 30 min to remove impurities on the surface, and then cooled to room temperature; then in Ar / H 2 In the atmosphere, the temperature was raised to 550°C at 5°C / min and then kept for 3 hours to obtain H-TiO with oxygen vacancy defects 2 ;

[0042] 2. Coating: add 84μl pyrrole monomer and 92μl phytic acid into 2.50ml isopropanol and ultrasonically disperse to obtain the first solution; mix the aqueous solution containing 0.274g ammonium persulfate with 60mgH-TiO 2 and TiO 2 Add it to the first solution, carry out ultrasonic dispersion and polymerization for 5 minutes, and obtain H-TiO coated with polypyrrole gel. 2 and TiO 2 granular gel;

[0043] 3. Electrode sheet preparation: the obtained H-TiO coated with polypyrrole gel 2 and TiO 2 The gel of the particles is directly and evenly coated on the surface of copper foil. After drying ...

Embodiment 3

[0045] 1. Hydrogenation treatment: P25 type TiO 2 The powder sample was placed in a vacuum reactor at 300 °C in an argon atmosphere for 30 min to remove impurities on the surface, and the treated material was placed in Ar / H 2 In the atmosphere, the temperature was raised to 550°C at 5°C / min and then kept for 3 hours to obtain H-TiO with oxygen vacancy defects 2 ;

[0046] 2. Coating: Add 84 μl of pyrrole monomer and 184 μl of phytic acid solution (50% to water mass ratio) into 2.50 ml of isopropanol and ultrasonically disperse to obtain the first solution; mix 0.274 g of ammonium persulfate with 60 mg of H-TiO 2 Add it into the first solution, conduct ultrasonic dispersion, and polymerize for 20 minutes to obtain H-TiO coated with polypyrrole gel 2 a second solution of particles;

[0047] 3. Cross-linking: add 0.8 mg of single-walled carbon nanotubes to the second solution, carry out ultrasonic dispersion, and cross-linking reaction for 5 minutes to obtain TiO 2 / polypyrro...

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Abstract

The invention discloses a preparing method of a composite electrode material and an application thereof; according to the method, polypyrrole gel is directly covered on the surface of the P25 type TiO2 particle material treated with hydrogenation, wherein the polypyrrole gel adulated with phytic acid is formed through hydrogenation treatment, covering and crosslinking of pyrrole monomeron, phytic acid and ammonium persulfate. Then single-walled carbon nanotube serves as a framework to prepare and obtain the composite electrode material with a 3D reticular structure, the composite electrode material has the advantages of good conductivity, high first discharge capacity and good rate capability and cycle performance. Meanwhile, when the composite electrode material is applied to a super capacitor, conductive agent and binder don't need to be added, which reduces commercial cost, enables more convenient use and is beneficial to commercial popularization of secondary chemical power source.

Description

technical field [0001] The invention relates to the field of electrode materials, in particular to a preparation method and application of a composite electrode material. Background technique [0002] At present, the energy crisis is becoming more and more serious, and the development of new energy has become a major problem in the new century. How to store these energy efficiently and quickly has become a major problem. Among the current commercialized secondary chemical power sources (batteries, supercapacitors, etc.), lithium-ion batteries due to their ultra-high energy density (150W h kg -1 ) and higher working voltage (3-4.5V) have become current research hotspots, however, its lower power density (<1kW / kg) and shorter cycle life (thousands of times) have affected its ability to use high power Applications in terms of output and long cycle life requirements (such as pure electric vehicles). In contrast, supercapacitors possess ultra-high power densities (2-5kW kg ...

Claims

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Application Information

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IPC IPC(8): H01G11/46H01G11/48H01G11/36H01G11/50H01G11/86H01M4/36H01M4/48H01M4/60H01M4/583
CPCH01G11/36H01G11/46H01G11/48H01G11/50H01G11/86H01M4/362H01M4/48H01M4/483H01M4/583H01M4/602Y02E60/10Y02E60/13
Inventor 曹六俊刘昊汤刚梅军
Owner CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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