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Long-life lithium-sulfur battery positive electrode and preparation method of lithium-sulfur battery

A lithium-sulfur battery, long-life technology, applied in the manufacture of battery electrodes, electrode carriers/collectors, electrolyte batteries, etc., can solve the problem of high conductivity of macroporous carbon materials, poor conductivity of sulfur electrodes, and capacity decline of lithium-sulfur batteries and other issues, to achieve the effect of improving high-rate discharge performance, improving cycle life, and reducing power generation costs

Inactive Publication Date: 2017-07-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the biggest problem of lithium-sulfur batteries is that lithium polysulfide dissolved in the electrolyte is formed during charging and discharging, and the dissolved lithium polysulfide reacts with lithium metal in the negative electrode, causing capacity loss, which leads to a rapid decline in the capacity of lithium-sulfur batteries, showing extreme poor cycle life
In the process of sulfur loading, it is inevitable that elemental sulfur is adsorbed on the outer surface of porous carbon particles, resulting in an increase in the interparticle resistance and a deterioration of the conductivity of the sulfur electrode. The electrode thus prepared shows a large impedance, which seriously affects the macropore The performance of carbon materials with high conductivity

Method used

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  • Long-life lithium-sulfur battery positive electrode and preparation method of lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment one: glucose melamine prepolymerization

[0037] 10 g of melamine was heated to 80° C. and dissolved in 5 wt % dilute hydrochloric acid (50 mL), 5 g of glucose was dissolved in 5 mL of deionized water, and the mass ratio of melamine to glucose was 1:0.5. Add the melamine solution into the glucose solution, place it in a 90°C water bath, and stir thoroughly. After reacting for 45 minutes, the viscosity of the liquid increased significantly, and the color changed from milky white to light yellow to reddish brown, and then cooled to obtain a glucose melamine prepolymer solution.

Embodiment 2

[0038] Embodiment two: preparation of polystyrene suspension

[0039] The polystyrene (PS) of 5g is dissolved in ethyl acetate (40mL) as dispersed phase A, configures the absolute ethanol solution (100mL) containing the sodium dodecylsulfonate of 30wt% simultaneously as continuous phase B, by The homogenizer prepared emulsion C at 8000 rpm. The emulsion solution C was transferred to an ultrasonic cleaner, and ultrasonically treated for 15 minutes to obtain a PS suspension.

Embodiment 3

[0040] Example 3: Preparation of macroporous carbon precursor

[0041] 10 g of melamine was heated to 80° C. and dissolved in 5 wt % dilute hydrochloric acid (50 mL), 20 g of glucose was dissolved in 20 mL of deionized water, and the mass ratio of melamine to glucose was 1:2. Add the melamine solution into the glucose solution, place it in a 90°C water bath, and stir thoroughly. After reacting for 45 minutes, the viscosity of the liquid increased significantly, and the color changed from milky white to light yellow to reddish brown, and then cooled to obtain a glucose melamine prepolymer solution.

[0042] The polystyrene (PS) of 7.5g is dissolved in ethyl acetate (40mL) as dispersed phase A, configures the absolute ethanol solution (100mL) containing the sodium dodecylsulfonate of 30wt% simultaneously as continuous phase B, Emulsion C was prepared by a homogenizer at 8000 rpm. The emulsion solution C was transferred to an ultrasonic cleaner, and subjected to ultrasonic treat...

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Abstract

The invention relates to the field of batteries and aims to provide a long-life lithium-sulfur battery positive electrode and a preparation method for the lithium-sulfur battery. The positive electrode uses conductive polymer polyaniline as a binder, and the surface is covered with Li+ type Nafion resin. Cut the positive electrode into a disc and place it in the button battery casing, so that the aluminum film of the positive electrode is in contact with the battery casing; place the microporous polypropylene separator on the positive electrode, and place the lithium negative electrode with surface nitriding treatment on the polypropylene On the diaphragm, the lithium nitride-containing layer of the metal lithium sheet faces the diaphragm; after the foamed nickel sheet is placed, the electrolyte is added, the sealing ring and the battery cover are sealed, and a button lithium-sulfur battery is obtained. Using the high-performance polyaniline-modified sulfur electrode of the present invention can effectively improve the cycle life and high-rate discharge performance of lithium-sulfur batteries, and can be used not only as power batteries for electric vehicles, but also widely used in wind power generation, solar power generation, and tidal power generation And other large unsteady-state power plants, play the role of power regulation.

Description

technical field [0001] The invention relates to the field of batteries, and relates to a metal lithium negative electrode that uses surface nitriding treatment, nitrogen-containing macroporous carbon-supported sulfur as the positive electrode material, and particularly relates to the use of polycondensation of melamine and glucose, using nano-polystyrene as a template, and one-time heat treatment A method for obtaining nitrogen-containing macroporous carbon; using conductive polymer polyaniline as a binder, the polyaniline network is connected to a highly conductive positive electrode formed by nitrogen-containing macroporous carbon-supported sulfur particles, and has a lithium-ion type perfluorosulfonic acid resin protection. long-life cathode and its method for lithium-sulfur batteries. Background technique [0002] Lithium-sulfur battery is a kind of lithium-ion battery. Sulfur is used as the positive electrode material of the battery. It has the advantages of light weigh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M4/62H01M4/66H01M10/058
CPCH01M4/139H01M4/62H01M4/622H01M4/663H01M10/058H01M2004/028H01M2220/10H01M2220/20Y02E60/10Y02P70/50
Inventor 李洲鹏王粲刘宾虹
Owner ZHEJIANG UNIV
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