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Anode composite material of lithium sulfur battery and preparation method thereof

A composite material, lithium-sulfur battery technology, applied in battery electrodes, circuits, electrical components and other directions, can solve the problems of general working voltage stability, poor conductivity of positive electrode materials, low battery cycle stability, etc., and achieves a simple and feasible preparation method. Excellent electrical conductivity and improved electrochemical reversibility

Active Publication Date: 2010-06-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at this stage, lithium-sulfur batteries still have application and technical difficulties such as poor conductivity of cathode materials and low battery cycle stability.
[0004] The electrochemical inertness of sulfur element at room temperature determines that as a positive electrode material, it must be doped with a large amount of conductive agent to improve the electrochemical activity, resulting in an irreversible loss of the total capacity of the material.
At the same time, the multi-step electrochemical reaction of the lithium-sulfur battery system makes there are two discharge voltage platforms of 2.3V and 2.1V during discharge, the working voltage stability is average, and the voltage is low
Metal lithium is used as the negative electrode. During the charge-discharge cycle, repeated dissolution and deposition reactions of lithium metal will occur on the surface of the negative electrode, and pulverization and dendrites will occur on the surface of the lithium metal, which poses a serious threat to the safety of the battery and shortens the battery life. cycle life of the battery

Method used

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  • Anode composite material of lithium sulfur battery and preparation method thereof
  • Anode composite material of lithium sulfur battery and preparation method thereof
  • Anode composite material of lithium sulfur battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh elemental sulfur (100 mesh, Aldrich) and unsubstituted polythiophene (PTh) with a mass ratio of 25:75, put PTh in a vacuum ball mill tank, remove the air in the tank and inject N 2 As an inert gas shielding gas for 10 to 30 minutes. Ball mill at room temperature for 3 to 12 hours, add the weighed elemental sulfur after the tank body is cooled, then remove the air in the tank body, pass in protective gas Ar for about 10 to 30 minutes, and put the tank at 80 to 120°C The temperature is kept constant for 3-6 hours to obtain a sulfur content of 25% in the composite material.

[0027] The battery was discharged at a constant current with a current density of 50mA / g, and the charging lower limit voltage was 1V, and then charged with a constant current at a current density of 50mA / g, and the charging upper limit voltage was 3.0V, and the charging and discharging cycle was 50 times. The first discharge specific capacity of the sulfur electrode is 851.4mAh / g, and two obvi...

Embodiment 2

[0029] Weigh elemental sulfur and unsubstituted polythiophene (PTh) with a mass ratio of 30:70, put PTh in a vacuum ball mill tank, remove the air in the tank and inject N 2 As an inert gas shielding gas for 10 to 30 minutes. Ball mill at room temperature for 3 to 12 hours, add the weighed elemental sulfur after the tank body is cooled, then remove the air in the tank body, pass in protective gas Ar for about 10 to 30 minutes, and put the tank at 80 to 120°C The temperature is kept constant for 3-6 hours to obtain a sulfur content of 30% in the composite material.

[0030] The battery was discharged at a constant current with a current density of 50mA / g, and the charging lower limit voltage was 1V, and then charged with a constant current at a current density of 50mA / g, and the charging upper limit voltage was 3.0V, and the charging and discharging cycle was 50 times. The first discharge specific capacity of the sulfur electrode is 1000.4mAh / g, and there are 2.3V and 2.1V dis...

Embodiment 3

[0032] Weigh sublimed sulfur and unsubstituted polythiophene (PTh) with a mass ratio of 40:60, place PTh in a vacuum ball mill tank, remove the air in the tank and inject N 2 As an inert gas shielding gas for 10 to 30 minutes. Ball mill at room temperature for 3 to 12 hours, add the weighed elemental sulfur after the tank body is cooled, then remove the air in the tank body, pass in protective gas Ar for about 10 to 30 minutes, and put the tank at 80 to 120°C The temperature is kept constant for 3-6 hours to obtain a sulfur content of 40% in the composite material.

[0033] The battery is charged and discharged 50 times at 100mA / g, and the range is 1-3V. The initial discharge specific capacity of the sulfur electrode was 1003.2mAh / g, and the discharge specific capacity remained at 808.2mAh / g after 20 cycles, showing good cycle stability.

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Abstract

The invention mainly provides an anode composite material of a lithium sulfur battery and a preparation method thereof and belongs to the technical field of chemical energy storage batteries. The novel sulfur composite material is prepared by using mechanical high energy ball milling in the presence of an inert gas and an oxygen-insulating thermal compound method to uniformly mixing or coating a sulfur conductive polymer, a sulfur anode active ingredient and a catalytic conductive oxide. The sulfur active matter in the material has high electrochemic conductivity and the nano particles obtained by grinding the material have high absorption performance, so the cycle life performance of the lithium sulfur battery is improved effectively.

Description

technical field [0001] The invention mainly relates to a lithium-sulfur battery cathode composite material and a preparation method thereof, belonging to the field of chemical energy storage batteries. The invention uniformly mixes or coats the sulfur-containing conductive polymer and the sulfur cathode active component through mechanical grinding and thermal compounding, so as to effectively improve the cycle life performance of the lithium-sulfur battery. Background technique [0002] In recent years, with the continuous advancement of science and technology and the rapid development of various electronic products, the chemical power sources used are required to have the characteristics of light weight, small size, and large capacity. Although the performance of batteries can be improved to a certain extent by improving the preparation of existing battery materials and battery manufacturing processes, the development of new materials and new systems must be used to increas...

Claims

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Application Information

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IPC IPC(8): H01M4/137H01M4/1399B02C17/00B02C17/18
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 陈人杰陈君政吴锋吴生先李丽陈实王国庆
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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