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High-energy flexible electrode material, preparation method thereof and application in secondary battery

A flexible electrode and high-energy technology, applied in the field of electrochemical batteries, can solve the problems of poor cycle performance and difficult capacity of lithium-sulfur battery electrode materials, and achieve excellent flexibility, superior flexibility and conductivity, and superior rate performance Effect

Active Publication Date: 2011-11-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a high-energy flexible electrode material and its preparation method, and apply the high-energy flexible electrode material in a high-energy flexible lithium-sulfur secondary battery to solve the problem of elemental sulfur in the application of lithium-sulfur secondary batteries Lithium-sulfur battery electrode material capacity is difficult to play, poor cycle performance and other issues

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  • High-energy flexible electrode material, preparation method thereof and application in secondary battery
  • High-energy flexible electrode material, preparation method thereof and application in secondary battery
  • High-energy flexible electrode material, preparation method thereof and application in secondary battery

Examples

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Embodiment 1

[0042] (1) Preparation of alumina template for adsorption of sulfate ions: pure aluminum foil (99.99wt%, 60-200 microns in thickness) is anodized in 15wt% concentration sulfuric acid aqueous electrolyte for 2h, and the reaction temperature is 10°C; through 1mol / L Phosphoric acid and perchromate H 2 CrO 4 The aqueous solution (the volume ratio of phosphoric acid aqueous solution and perchromic acid aqueous solution is 1:1) was treated at 60°C for 0.5h to remove the anodized aluminum film formed for the first time, so that the pore structure of the second anodic oxidation could be more regular, and then Carry out secondary anodic oxidation in 15wt% concentrated sulfuric acid aqueous solution electrolyte for 4h, reaction temperature is 10 ℃, obtains the aluminum oxide porous template that one end opens and adsorbs sulfate ion; The thickness of porous template is 40-50 microns, and the pore size distribution is 20-30 Nano.

[0043] (2) Preparation of carbon nanotube / sulfur compo...

Embodiment 2

[0052] The difference from Example 1 is that

[0053] (1) Preparation process On the basis of Example 1, the concentration of sulfate ions in the electrolyte was changed in this embodiment, and anodic oxidation was carried out in the electrolyte of 30wt% concentration sulfuric acid aqueous solution for 2h, and the reaction temperature was 10°C; by 1mol / L phosphoric acid and perchromic acid aqueous solution (the volume ratio of phosphoric acid aqueous solution and perchromic acid aqueous solution is 1: 1) after 60 ℃ treatment 0.5h, then carry out secondary anodic oxidation 4h in 30wt% concentration sulfuric acid aqueous electrolyte, reaction temperature The temperature is 10°C, and an aluminum oxide porous template with one end open and adsorbing a large amount of sulfate ions is obtained; the thickness of the porous template is 40 microns, and the pore size distribution is 20-30 nanometers.

[0054] (2) Preparation of carbon nanotube / sulfur composite material: place the sulfa...

Embodiment 3

[0057] The difference from Example 2 is that

[0058](1) Preparation process On the basis of Example 2, the time for chemical vapor deposition of carbon was increased. The specific implementation process is as follows: adopt 30wt% concentration sulfuric acid aqueous solution electrolyte to carry out anodic oxidation 2h, reaction temperature is 10 ℃; Pass 1mol / L phosphoric acid and perchromic acid solution (phosphoric acid aqueous solution and perchromic acid aqueous solution volume ratio are 1: 1) After treating at 60°C for 0.5h, carry out secondary anodic oxidation in 30wt% sulfuric acid aqueous electrolyte solution for 4h, the reaction temperature is 10°C, to obtain an alumina porous template with an open end and adsorption of sulfate ions; the thickness of the porous template is 40 microns with a pore size distribution of 15-20 nm.

[0059] (2) Preparation of carbon nanotube / sulfur composite material: Place the sulfate ion-containing alumina template obtained in step (1) i...

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Abstract

The invention belongs to the field of an electrochemistry battery, in particular to a high energy flexible electrode material and a preparation method thereof and application thereof in a high-energy flexible lithium sulfur storage battery. The preparation method for the flexible electrode material comprises the following steps: elementary sulfur is uniformly absorbed and embedded in micropores of a carbon nanometer tube wall to form micropore domain limiting carbon nanometer tube / sulfur composite material with an interconnected porous channel and a three-dimensional electric conduction network, wherein the content of the active substance. i.e. elementary sulfur is in the range of 10-71wt%; an acidic electrolyte anodic oxidation metal substrate containing sulfate ions is used for preparing a porous template, and a large number of sulfate ions are absorbed in the template; a carbon nanometer tube is prepared in a chemical vapor deposition process; meanwhile, the high temperature in-situ carbon heating is used for restoring the sulfate ions to form the elementary sulfur embedded in the tube wall of the carbon nanometer tube; after the porous template is removed, the carbon nanometer tube / sulfur flexible composite material is obtained in a solvent ultrasonic dispersion and liquid phase evaporation self-assembly process. The flexible electrode material can be applied to the positive electrode materials of a lithium sulfur battery and a flexible power storage device.

Description

technical field [0001] The invention belongs to the field of electrochemical batteries, and specifically relates to a high-energy flexible composite electrode material, a preparation method thereof, and an application in a high-energy flexible lithium-sulfur secondary battery. Background technique [0002] Due to the increasing popularity in mobile communication equipment, notebook computers, mobile phones, instrumentation and other fields and the potential application in electric vehicles / hybrid electric vehicles, high-efficiency energy storage devices have been highly valued by various countries in recent years and have become the focus of research and development. one of the fields. Especially as people's demand for various thin, flexible and good mechanical strength electronic devices (such as foldable and rollable display devices, implantable electronic devices, electronic tags and portable devices) continues to increase, the development of high flexibility, high Secon...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/139
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 李峰周光敏王大伟侯鹏翔成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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