Method for preparing lithium carbide/lithium sulfide composite anode material of lithium-sulfur battery by performing carbon thermal reduction on lithium sulfate

A technology of lithium-sulfur batteries and composite materials, which is applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems such as the final application of lithium-sulfur batteries, harmful by-products, complicated processes, etc., and achieve electrochemical performance. Excellent, reduced preparation cost, uniform dispersion effect

Inactive Publication Date: 2016-12-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, these solutions have solved some problems encountered in the preparation process of lithium sulfide to a certain extent, but their cost is still at a relatively high level, and they face many problems such as harmful by-products and complicated processes.
Not only that, these schemes only care about the synthesis process of lithium sulfide, and do not take into account the final application of lithium sulfur batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 12.8g Li 2 SO 4 ·H 2 O was dissolved in 10 mL of deionized water, and the solution was mixed with 4.8 g of porous carbon under stirring, and then dried at 95 °C, and the obtained porous carbon / Li 2 SO 4 The composite material was placed in a tube furnace, heated to 800°C and kept for 2 hours under the protection of high-purity nitrogen. After the material was lowered to room temperature, it was taken out under protective atmosphere conditions to obtain porous carbon / Li 2 S composites. Calculations show that the Li of the composite 2 The S loading was 54.3%. It is assembled with PVDF, acetylene black, lithium sheet, diaphragm, etc. to form a button battery, and the battery can still maintain a specific capacity of 775mAh / g after 100 cycles.

Embodiment 2

[0027] Weigh 0.1g Li 2 SO 4 ·H 2 O was dissolved in 10mL deionized water, and this solution was mixed with 100mL 5mg / mL graphene oxide solution evenly, and GO / Li 2 SO 4 composite material. Will GO / Li 2 SO 4 The composite material was placed in a tube furnace, heated to 800°C and kept for 2 hours under the protection of high-purity nitrogen. After the material was cooled to room temperature, it was taken out under a protective atmosphere to obtain rGO / Li 2 S composites. Calculations show that the Li of the composite 2 The S loading was 62.5%. It is directly used as the positive electrode of the lithium-sulfur battery and assembled into a button battery with a lithium sheet separator. The cycle test shows that the battery can still maintain a specific capacity of 810mAh / g after 100 cycles.

Embodiment 3

[0029] Mix 4.8g of carbon nanotubes with 50mL of 2moL / L lithium sulfate aqueous solution, lyophilize after ultrasonic dispersion for 2 hours, and obtain CNTs / Li 2 SO 4 composite material. Put the composite material in a tube furnace, under the protection of high-purity nitrogen, heat it to 800°C and keep it warm for 2 hours. After the material was lowered to room temperature, it was taken out under a protective atmosphere to obtain CNTs / Li 2 S composites. Calculations show that the Li of the composite 2 The S loading was 49.5%. It is assembled into a button battery with acetylene black, PVDF, lithium diaphragm, etc. The cycle test shows that the battery can still maintain a specific capacity of 693mAh / g after 100 cycles.

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Abstract

The invention relates to a method for preparing a lithium carbide/lithium sulfide (Li2S) composite anode material of a lithium-sulfur battery by performing carbon thermal reduction on lithium sulfate (Li2SO4), and belongs to the technical field of lithium-sulfur batteries. The lithium carbide/lithium sulfide composite material is prepared by performing the carbon thermal reduction on a lithium sulfate-containing composite material serving as a precursor under a condition of inert atmosphere protection, and is applied to an anode of the lithium-sulfur battery. The lithium sulfide composite material preparation method disclosed by the invention is a novel method for in-situ synthesis of the anode material of the lithium-sulfur battery; and the prepared lithium carbide/lithium sulfide composite material is high in active substance dispersivity and stable in structure, and has the advantages of high specific capacity, excellent circulating and rate capability and the like when used as an anode material of the lithium-sulfur battery. The method is easy to operate, low in preparation cost and favorable for large-scale production.

Description

technical field [0001] The invention relates to a method for preparing lithium-sulfur battery carbon / lithium sulfide composite cathode materials by carbothermal reduction of lithium sulfate, belonging to the technical field of lithium-sulfur batteries. Background technique [0002] In recent years, lithium-sulfur batteries have become one of the research hotspots of next-generation lithium batteries due to their high specific energy, cheap battery materials, and environmental friendliness. Lithium-sulfur battery cathode materials can be divided into carbon / elemental sulfur composite materials and carbon / lithium sulfide composite materials. Carbon / elemental sulfur composite materials have been widely studied due to their cheap and easy-to-obtain raw materials and simple preparation process. However, this type of material will produce a huge volume expansion during the first discharge process, resulting in irreversible damage to the material structure, thereby affecting the pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/052
CPCH01M4/364H01M4/5815H01M4/587H01M10/052Y02E60/10
Inventor 徐斌安亚斌朱奇珍赵倩
Owner BEIJING UNIV OF CHEM TECH
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