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Polypyrrole, mesoporous carbon and sulfur composite electrode material and secondary cell

A composite electrode and composite material technology, applied in non-aqueous electrolyte batteries, battery electrodes, circuits, etc., can solve the problems of high conductivity, specific surface area, large mechanical strength, poor cycle performance of polypyrrole, and low energy density, etc. The effect of draining, improving cycle stability, and high specific capacity

Inactive Publication Date: 2015-02-18
NANJING ZHONGCHU NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon materials are commonly used conductive agents. Among them, ordered mesoporous carbon has ordered mesoporous apertures, high electrical conductivity, large specific surface area, and high mechanical strength. It is an ideal electrode material, but its specific capacity is low and its energy density is low. smaller
Conductive polymers are also often combined with sulfur to prepare electrode materials. Among them, polypyrrole is a research hotspot for electrode materials due to its easy-to-obtain raw materials, high conductivity, high energy density, and fast charge and discharge. However, polypyrrole has poor cycle performance. Volume expansion and contraction occur during discharge, which makes it easy to fall off from the electrode

Method used

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  • Polypyrrole, mesoporous carbon and sulfur composite electrode material and secondary cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) The metal oxide V 2 o 5 Mix it with elemental sulfur (passed through a 400-mesh sieve) at a mass ratio of 10:1, ball mill at a speed of 200r / min for 5h under nitrogen protection, and then dry in a desiccator to form a composite material.

[0053] (2) Preparation of secondary aluminum battery: The above-mentioned composite material and binder PVDF (ratio: 9:1) are made into active material slurry, coated on a 0.6mm thick carbon-coated aluminum current collector, dried and rolled to About 0.33mm, cut into 40mm wide × 15mm long pole piece as the positive pole piece, and 0.16mm thick glass fiber non-woven diaphragm and negative pole are wound into a battery core and put into a nickel-plated steel case, and then injected with aluminum chloride-triethyl Amine hydrochloride ionic liquid, sealed to make AA-type cylindrical secondary aluminum battery.

Embodiment 2

[0055] (1) Prepare a mixed solution of 10ml tetrabutyl titanate and 5ml ethanol, add elemental sulfur to 100ml water first, then add the prepared mixed solution, place the mixed solution in a constant temperature water bath at about 60°C, stir while ultrasonically oscillating, and react 2 After ~10h, centrifuge to separate the precipitate, wash it with deionized water and ethanol, and dry it in vacuum at about 40°C to obtain a composite material;

[0056] (2) Preparation of secondary aluminum battery: The above composite material and binder PVDF (ratio: 9:1) are made into active material slurry, coated on a 0.6mm thick nickel foam substrate, dried and rolled to about 0.33mm, Cut into a 40mm wide × 15mm long pole piece as the positive pole piece, wind it into a battery core with a 0.16mm thick glass fiber non-woven separator and a negative pole, put it into a nickel-plated steel case, and then inject aluminum bromide-triethylamine hydrochloride Ionic liquid, sealed to make AA-t...

Embodiment 3

[0058] Measure 10ml of butyl titanate at room temperature, slowly drop it into 35ml of absolute ethanol, stir vigorously with a magnetic stirrer for 10min, and mix well to form a yellow clear solution A. Add 4ml of glacial acetic acid and 10ml of distilled water to another 35ml of absolute ethanol, stir vigorously to obtain solution B, drop in 1~2 drops of hydrochloric acid, and adjust the pH value so that the pH value is ≤3. In a water bath at room temperature, slowly drop the solution A that has been transferred into the constant pressure funnel into the solution B under vigorous stirring at a rate of about 3ml / min. After the dropwise addition, a light yellow sol was obtained. Add the sulfur element into the sol and stir evenly, then vacuum-dry at 80°C for 24 hours to form a gel, and then calcinate the gel at 500°C for 2-5 hours to form a composite material.

[0059] The preparation of the secondary aluminum battery is the same as in Example 1.

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Abstract

The invention relates to a secondary aluminum cell adopting a polypyrrole, mesoporous carbon and sulfur composite electrode material as a positive electrode. A preparation method of the polypyrrole, mesoporous carbon and sulfur composite material comprises the following steps: ordered mesoporous carbon is prepared with a template method; the activated ordered mesoporous carbon is taken as a carrier to prepare a polypyrrole and mesoporous carbon composite material with a three-dimensional porous structure with a chemical in-situ polymerization method; and then the surface and pores of the polypyrrole and mesoporous carbon composite material are coated with sulfur through heat treatment so as to obtain the polypyrrole, mesoporous carbon and sulfur composite electrode material. The prepared secondary aluminum cell has high specific capacity, good circulating stability and low cost, the preparation method is simple, and the polypyrrole, mesoporous carbon and sulfur composite electrode material is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of battery material science, and relates to a polypyrrole / mesoporous carbon / sulfur composite electrode material and a preparation method thereof, and also relates to a secondary aluminum battery including the composite cathode material. Background technique [0002] With the rapid development of new power sources such as electronic and communication equipment, electric vehicles, wind power generation and photovoltaic power generation, human beings have higher and higher requirements for battery performance of supporting power sources, and there is an urgent need to develop batteries with high energy, low cost, long life, and green , Power batteries and energy storage batteries that are rich in battery material resources and recyclable. Secondary aluminum-sulfur battery is a new type of battery system with high energy density, which has high application potential and commercial value. [0003] The working principle of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/05
CPCH01M4/364H01M4/5815H01M4/583H01M4/62H01M10/05Y02E60/10
Inventor 赵宇光钟毓娟
Owner NANJING ZHONGCHU NEW ENERGY
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