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Room-temperature sodium sulfur secondary battery

A secondary battery, sodium-sulfur technology, applied in the direction of secondary batteries, battery electrodes, battery components, etc., can solve the problems of low utilization efficiency of secondary batteries, poor battery stability, excessive battery internal resistance, etc., to achieve large Effects of discharge efficiency and cycle efficiency, improvement of electrical conductivity, and improvement of overall performance

Active Publication Date: 2015-01-21
内蒙古默锐能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing low-temperature sodium-sulfur secondary batteries often have low utilization efficiency of secondary batteries and short battery life due to problems such as low utilization of sulfur, excessive internal resistance of the battery, and poor battery stability, which affect its application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Positive sheet preparation:

[0047] According to the mass ratio of 1:2, the carbon nanotubes and sulfur were ground and mixed evenly, and then put into a tube furnace, and reacted at 155°C for 12 hours in a nitrogen atmosphere, and the black powder was obtained after the reaction was completed. carbon-sulfur composite material.

[0048] Dissolve PVDF in NMP to form a solution, then mix evenly according to the ratio of PVDF and carbon-sulfur composite material at 1:9, and prepare the slurry to make a black viscous battery positive electrode slurry. The prepared battery slurry was coated on aluminum foil with a 200 μm doctor blade.

[0049] Put the aluminum foil into a vacuum oven at 60°C for 12 hours and vacuum dry it for 12 hours, then cut it into the required shape according to the required requirements to make the positive electrode sheet.

[0050] Preparation of negative electrode sheet:

[0051] Mix metal sodium and aluminum at a mass ratio of 1:3, and heat at 6...

Embodiment 2

[0061] Prepare the electrolyte solution, which contains N-methylimidazole with a volume ratio of 3:10:1, dimethoxyethane (DME), and ethylene carbonate (EC), and the sodium salt of the electrolyte is sodium perchlorate, Sodium perchlorate concentration is 1.0mol / L;

[0062] Preparing the positive electrode sheet, compounding the sulfur composite active material and the conductive carbon material according to the weight ratio of 8:1 to form the positive electrode active material, coating and adhering the positive electrode active material on the copper foil to obtain the positive electrode sheet;

[0063] Prepare the negative electrode sheet, adhering the sodium aluminum alloy prepared by metal sodium and aluminum to the copper foil to obtain the negative electrode sheet;

[0064] Stack the positive electrode, diaphragm, and negative electrode in order, weld the tabs, put them into the battery case, fill with an appropriate amount of electrolyte, and then pump the liquid to seal...

Embodiment 3

[0066] Prepare electrolyte, prepare mixed solution, the volume percentage of mixed solution is composed of: 20% N-methylimidazole, 40% tetrahydrofuran (THF) and 40% dimethoxyethane (DME), above mixed solution preparation into 1.0mol / L sodium perchlorate electrolyte;

[0067] Prepare the positive electrode sheet, compound the active material sulfur and graphite according to the weight ratio of 1:2 to form a sulfur composite active material, then compound the sulfur composite active material and carbon material according to the weight ratio of 10:1 to form a positive electrode active material, and make the positive electrode active material Coating and adhering to aluminum foil to obtain a positive electrode sheet;

[0068] Prepare the negative electrode sheet, adhering the sodium aluminum alloy prepared by metal sodium and aluminum to the iron foil to obtain the negative electrode sheet;

[0069] PP microporous membrane is used as the separator of the battery;

[0070] Stack ...

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Abstract

The invention discloses a room-temperature sodium sulfur secondary battery. The room-temperature sodium sulfur secondary battery comprises a positive plate, a negative plate, an electrolyte solution and a diaphragm which are held in a battery shell, wherein the electrolyte in the electrolyte solution comprises imidazole electrolyte and also comprises chain-shaped and ring-shaped ether electrolyte and / or chain-shaped and ring-shaped ester electrolyte; a positive active material is adhered to the surface of the positive plate and is prepared by compounding a sulfur composite active material and a conductive agent with a conductive effect according to a weight ratio of (8-10) to 1. According to the room-temperature sodium sulfur secondary battery, the internal resistance of the battery is reduced; the storage and utilization of sulfur in the battery are improved; the sulfur utilization efficiency is improved; the room-temperature sodium sulfur secondary battery is high in conductivity; positive and negative active materials can be fully used; the performance of the battery can be improved; the service life of the battery can be prolonged; the room-temperature sodium sulfur secondary battery has a strong competitiveness in the secondary battery market in the future.

Description

technical field [0001] The invention relates to the technical field of sodium-sulfur batteries, in particular to a sodium-sulfur secondary battery that operates stably at room temperature. Background technique [0002] With the increasing use of energy, the new energy strategy is listed as a key support project by various countries. The United Nations Conference on New and Renewable Energy defines new energy as: based on new technologies and materials, making traditional renewable energy Renewable energy has been developed and utilized in a modern way, replacing fossil energy with limited resources and pollution to the environment with inexhaustible and recurring renewable energy, focusing on the development of solar energy, wind energy, biomass energy, tidal energy, geothermal energy, and hydrogen energy and nuclear energy (atomic energy) bits. [0003] At present, the thermal energy, kinetic energy and other energy of new energy are generally converted into electric energ...

Claims

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Application Information

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IPC IPC(8): H01M10/0563H01M4/62H01M2/14
CPCH01M4/625H01M10/0563H01M50/40Y02E60/10
Inventor 杨树仁樊曰伟单海山王德强王全义
Owner 内蒙古默锐能源材料有限公司
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