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Anode material of lithium-sulfur battery, lithium-sulfur battery and method for preparing anode material

A positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, lithium batteries, battery components, etc., can solve the problem of insufficient suppression, achieve the effects of avoiding direct contact, inhibiting the shuttle effect, and increasing the diffusion rate

Active Publication Date: 2015-05-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported that a graphene improves the positive electrode and separator while improving the lithium-sulfur battery (Zhou, G. et al.A Graphene–Pure-Sulfur Sandwich Structure for Ultrafast, Long-Life Lithium–Sulfur Batteries.Advanced Materials, 625–631, doi:10.1002 / adma.201302877(2013).), but its suppression of the "flying shuttle effect" is still not effective enough, and the obtained material still has hydrophobic properties, and the room temperature inhibits the ion conductivity of lithium-sulfur batteries

Method used

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  • Anode material of lithium-sulfur battery, lithium-sulfur battery and method for preparing anode material
  • Anode material of lithium-sulfur battery, lithium-sulfur battery and method for preparing anode material
  • Anode material of lithium-sulfur battery, lithium-sulfur battery and method for preparing anode material

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Experimental program
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Effect test

Embodiment 1

[0075] Dissolve 2.0g of carbon nanotubes in 80mL of aqueous solution containing 6.0g of sodium hydroxide, and conduct a hydrothermal reaction at 180°C for 3 hours in a closed environment to obtain reaction product 1. After centrifuging, the reaction product 1 is separated to obtain a precipitate, and washed with water to pH If it is neutral, a functionalized carbon nanomaterial is obtained. Add 2 g of functionalized carbon nanomaterials into 0.08 mol of sodium thiosulfate aqueous solution, stir well to obtain a mixed solution, add 0.2 mol / L dilute hydrochloric acid dropwise at a rate of 20 μL / min to the mixed solution at 20 ° C, and the dropwise addition ends After reacting at 20°C for 12 hours, the reaction product 2 was obtained. The reaction product 2 was centrifuged and separated to obtain a precipitate, washed with water until the pH was neutral, and dried to obtain a functionalized carbon nanomaterial coated with sulfur on the outside. Add 2 g of functionalized carbon na...

Embodiment 2

[0086] Dissolve 2.0g of carbon nanospheres in 80mL of aqueous solution containing 6.0g of sodium hydroxide, and conduct a hydrothermal reaction at 180°C for 3 hours in a closed environment to obtain reaction product 1. After centrifuging, the reaction product 1 is separated to obtain a precipitate, and washed with water to pH If it is neutral, a functionalized carbon nanomaterial is obtained. Add 2 g of functionalized carbon nanomaterials into 0.08 mol of sodium thiosulfate aqueous solution, stir well to obtain a mixed solution, add 0.2 mol / L dilute hydrochloric acid dropwise at a rate of 20 μL / min to the mixed solution at 20 ° C, and the dropwise addition ends After reacting at 20°C for 12 hours, the reaction product 2 was obtained. The reaction product 2 was centrifuged and separated to obtain a precipitate, washed with water until the pH was neutral, and dried to obtain a functionalized carbon nanomaterial coated with sulfur on the outside. Add 2 g of functionalized carbon ...

Embodiment 3

[0097] Dissolve 2.0g of graphene in 80mL of aqueous solution containing 6.0g of sodium hydroxide, conduct a hydrothermal reaction in a closed environment at 180°C for 3 hours to obtain reaction product 1, centrifuge reaction product 1 and separate to obtain a precipitate, wash with water until the pH is Neutral to obtain functionalized carbon nanomaterials. Add 2 g of functionalized carbon nanomaterials into 0.08 mol of sodium thiosulfate aqueous solution, stir well to obtain a mixed solution, add 0.2 mol / L dilute hydrochloric acid dropwise at a rate of 20 μL / min to the mixed solution at 20 ° C, and the dropwise addition ends After reacting at 20°C for 12 hours, the reaction product 2 was obtained. The reaction product 2 was centrifuged and separated to obtain a precipitate, washed with water until the pH was neutral, and dried to obtain a functionalized carbon nanomaterial coated with sulfur on the outside. Add 2 g of functionalized carbon nanomaterials coated with sulfur on ...

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Abstract

The invention relates to an anode material of a lithium-sulfur battery, the lithium-sulfur battery and a method for preparing the anode material, and belongs to the field of battery materials. The center of the anode material is made of a functionalized carbon nano-material, the middle interlayer is made from sulfur, and the outer layer adopts a polydopamine film, wherein the functionalization method is hydroxylation or carboxylation. The preparation method comprises the following steps: dissolving the carbon nano-material in an alkaline or acid liquid to obtain the functionalized carbon nano-material; adding the functionalized carbon nano-material in a sulfur water solution, stirring, dropwise adding diluted acid to the solution, and obtaining the functionalized carbon nano-material coated with sulfur on the outer side; adding the functionalized carbon nano-material coated with sulfur on the outer side in a tris(hydroxymethyl) methane buffer solution, and performing a polymerization reaction to a dopamine hydrochloride solution, so as to obtain the anode material. The invention further relates to the lithium-sulfur battery using the anode material. The battery can further comprise a polyethylene diaphragm modified by polydopamine. The anode material can inhibit the shuttle flying effect and the structural damage caused by volume expansion; and the lithium-sulfur battery is good in cycle performance and capacity retention ratio.

Description

technical field [0001] The invention relates to a positive electrode of a lithium-sulfur battery, a lithium-sulfur battery and a preparation method thereof, belonging to the technical field of battery materials. Background technique [0002] Fossil resources are gradually decreasing with the exploitation of human beings, and energy crisis and environmental pollution are problems that need to be solved urgently. Lithium secondary batteries have the characteristics of high specific energy, long cycle life, and no pollution. They are ideal mobile power supplies for portable devices, power supplies for electric vehicles, and energy storage batteries for energy storage power stations. my country is rich in lithium ore resources, and the application of lithium secondary batteries is the best way to solve my country's energy structure and environmental problems. However, the lithium secondary batteries widely used in the market are still based on traditional lithium-ion batteries,...

Claims

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Application Information

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IPC IPC(8): H01M10/052H01M2/16H01M4/583H01M4/139H01M4/62H01M50/403H01M50/417H01M50/489
CPCY02E60/10
Inventor 吴锋陈人杰叶玉胜钱骥李丽
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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