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New electrode modification method

A technology of electrode modification and conductive agent, which is applied to battery electrodes, circuits, electrical components, etc., and can solve the problems of low capacity and energy of lithium-ion batteries and the inability to meet the requirements of large electrical appliances for electric vehicles.

Inactive Publication Date: 2013-05-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low capacity and energy of lithium-ion batteries, they can only be used in small electrical appliances such as mobile phones, notebook computers, and digital cameras, and cannot meet the requirements of large electrical appliances for electric vehicles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Add the sublimated sulfur and super-P into the grinding tank at a ratio of 7:2, add 25 ml of ethanol, mill in a ball mill with a rotating speed of 300r / min for 9 hours, take it out, and put it in a blast drying oven at 50°C Dried to make a sulfur / super-P composite material.

[0019] (2) Mix the sulfur / super-P composite material with acetylene black and PVDF in a weight ratio of 7:2:1 by wet method, apply it on aluminum foil, and dry it in a blast drying oven at 50°C to prepare into electrodes.

[0020] (3) The DOW film solution with a mass fraction of 1% was evenly coated on the surface of the electrode, and then dried at room temperature to form a film to make a modified electrode.

Embodiment 2

[0022] (1) Add the sublimated sulfur and acetylene black into the grinding tank at a ratio of 7:2, add an appropriate amount of 25 ml of ethanol, mill in a ball mill with a rotation speed of 300r / min for 9 hours, take it out, and place it in a blast drying oven at 50°C Dry to make sulfur / acetylene black composite material.

[0023] (2) Mix the sulfur / acetylene black composite material, acetylene black, and PVDF in a weight ratio of 7:2:1 by a wet method, apply it on an aluminum foil, and dry it in a blast drying oven at 50°C to obtain electrode.

[0024] (3) The DOW film solution with a mass fraction of 2% was evenly coated on the surface of the electrode, and then dried at room temperature to form a film to make a modified electrode.

Embodiment 3

[0026] (1) Add the sublimated sulfur and BP2000 into the grinding tank at a ratio of 8:2, add an appropriate amount of 25 ml of ethanol (the specific value should be used), ball mill in a ball mill with a rotating speed of 300r / min for 9 hours, take it out, and dry it in the air Dry it in a box at 50°C to make a sulfur / BP2000 composite material.

[0027] (2) Then, the sulfur / BP2000 composite material, acetylene black, and PVDF were mixed uniformly by wet method in a weight ratio of 7:2:1, coated on aluminum foil, and dried at 50°C in a blast drying oven to obtain electrode.

[0028] (3) The Aciplex membrane solution with a mass fraction of 5% was evenly coated on the surface of the electrode, and then dried at room temperature to form a film to make a modified electrode.

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Abstract

The invention discloses a new electrode modification method. The new electrode modification method comprises the following steps of: firstly carrying out ball grinding on sublimed sulphur and acetylene black or superconductive carbon black in the mass ratio of 7:2, 1:1 or 8:2, and preparing a sulphur carbon composite material after drying; then mixing the sulphur carbon composite material with an acetylene black conductive agent and a binder PVDF (polyvinylidene fluoride) in the mass ratio of 7:2:1 by adopting a wet process, coating the obtained mixture on an aluminium foil, and preparing an electrode after drying; and coating a layer of membrane solution containing 1-5% of perfluorinated sulfonic acid substances on the surface of the electrode, so as to obtain the modified electrode. A lithium sulphur battery assembled by adopting the modified electrode (which is used as the positive electrode) prepared by using the method disclosed by the invention and metal lithium has a relatively good cycling performance and relatively high charging and discharging efficiency, and the efficiency is more than 92% and is far higher than that of a battery with an unmodified electrode.

Description

technical field [0001] The invention relates to battery cathode materials in the field of electrochemistry, in particular to a method for modifying the cathode of a lithium-sulfur battery. Background technique [0002] With the continuous consumption of non-renewable energy such as petroleum, the demand for renewable energy such as electricity in today's society continues to increase. But electric energy can only be widely used if it is stored effectively. Lithium-ion batteries have been extensively researched and found some applications in the past three decades. However, due to the low capacity and energy of lithium-ion batteries themselves, they can only be used in small electrical appliances such as mobile phones, notebook computers, and digital cameras, and cannot meet the requirements of large electrical appliances for electric vehicles. [0003] Lithium-sulfur battery is a battery with high capacity and high energy. Its anode is a sulfur / carbon composite material an...

Claims

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Application Information

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IPC IPC(8): H01M4/139
CPCY02E60/122Y02E60/10
Inventor 单忠强唐其伟田建华
Owner TIANJIN UNIV
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