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Lithium-sulfur battery composite cathode material and preparation method thereof

A composite positive electrode material and lithium-sulfur battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unsatisfactory electrical properties of carbon-sulfur composite materials, achieve low cost, simple preparation method, and improve cycle performance Effect

Active Publication Date: 2019-04-26
宁波猎知乐科技咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if this method is used on other biomass, especially the material itself is far worse than Spirogyra, the electrical properties of the prepared carbon-sulfur composites are often not ideal.

Method used

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  • Lithium-sulfur battery composite cathode material and preparation method thereof
  • Lithium-sulfur battery composite cathode material and preparation method thereof
  • Lithium-sulfur battery composite cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Soak the lotus root in deionized water for 24 hours, and ultrasonically clean it for 60 minutes. In the tube furnace, the heating rate of the tube furnace is raised to 500°C at a rate of 3°C / min, and then carbonization is carried out at this temperature for 3 hours, and the furnace temperature is naturally cooled to room temperature to obtain biomass carbon, which is ground into powder Then weigh the obtained powder, potassium hydroxide and deionized water in a mass ratio of 1:4:25, mix the weighed powder, potassium hydroxide and deionized water to form a mixed solution, and then Dry the mixed solution in a drying oven at a constant temperature; put the dried material into a tube furnace filled with inert gas, and the tube furnace rises to 900 °C at a rate of 3 °C / min, and then at this temperature Carry out 3h of carbonization heat preservation, and then cool the carbonization furnace to room temperature to obtain the porous carbon with lotus root as the carbon source; ...

Embodiment 2

[0038] Soak the lotus root in deionized water for 24 hours, and ultrasonically clean it for 60 minutes. In the tube furnace, the heating rate of the tube furnace is raised to 400°C at a rate of 1°C / min, and then carbonization is carried out at this temperature for 8 hours, and the furnace temperature is naturally cooled to room temperature to obtain biomass carbon, which is ground into powder Then weigh the obtained powder, potassium hydroxide and deionized water in a mass ratio of 1:2:25, mix the weighed powder, potassium hydroxide and deionized water to form a mixed solution, and then Dry the mixed solution in a drying oven at a constant temperature; put the dried material into a tube furnace filled with inert gas, and the tube furnace rises to 900 °C at a rate of 1 °C / min, and then at this temperature Carry out 8h of carbonization heat preservation at the same time, and then cool the carbonization furnace to room temperature to obtain the porous carbon with lotus root as th...

Embodiment 3

[0041] Soak the lotus root in deionized water for 24 hours, and ultrasonically clean it for 60 minutes. In the tube furnace, the heating rate of the tube furnace is raised to 500°C at a rate of 3°C / min, and then carbonization is carried out at this temperature for 3 hours, and the furnace temperature is naturally cooled to room temperature to obtain biomass carbon, which is ground into powder Then weigh the obtained powder, potassium hydroxide and deionized water in a mass ratio of 1:4:25, mix the weighed powder, potassium hydroxide and deionized water to form a mixed solution, and then Dry the mixed solution in a drying oven at a constant temperature; put the dried material into a tube furnace filled with inert gas, and the tube furnace rises to 900 °C at a rate of 3 °C / min, and then at this temperature Carry out 2h of carbonization heat preservation at lower temperature, then cool the carbonization furnace to room temperature, and obtain the porous carbon with lotus root as ...

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Abstract

The invention discloses a lithium-sulfur battery composite cathode material and a preparation method thereof. The method specifically comprises the following steps: taking lotus root biomass as a material, washing the lotus root biomass with a cleaning solution, pre-carbonizing the lotus root biomass, activating the lotus root biomass with potassium hydroxide, placing the lotus root biomass in a tube furnace for heat preservation and carbonization to obtain porous carbon, mixing the porous carbon and sulfur according to a certain mass ratio, grinding the mixture, placing the powder mixture ina vacuum oven for carbon-sulfur compounding, finally, putting the compound into an aqueous solution of hexamethylenetetramine and nickel nitrate, and heating for a period of time to obtain the nickel-based hydroxide-coated porous carbon-sulfur composite material. The preparation method is relatively simple, the cost is low, and it is expected to obtain a lithium-sulfur battery with higher performance-price ratio.

Description

technical field [0001] The invention belongs to the technical field of battery anode materials, and in particular relates to a lithium-sulfur battery composite anode material and a preparation method thereof. Background technique [0002] Lithium-sulfur batteries have an ultra-high theoretical specific capacity (1675mA·h·g -1 ), with low cost and high safety, is a secondary battery system with broad application prospects. However, the elemental sulfur cathode material for lithium-sulfur batteries is an insulating material (conductivity at room temperature is 5×10-30S·cm -1 ), the intermediate product long-chain lithium polysulfide (Li 2 Sn, 4≤n≤8) is easily dissolved in the electrolyte, a shuttle effect occurs between the sulfur cathode and the lithium anode, and reacts with the lithium anode to form insulating and insoluble Li on the electrode surface 2 S 2 / Li 2 The deposition of S prevents the transmission of electrons and ions, resulting in low utilization of active...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5815H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 武军颜圣潘芝杰戴洋徐军明宋开新高惠芳
Owner 宁波猎知乐科技咨询有限公司