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A lithium-sulfur battery positive electrode material, lithium-sulfur battery and preparation method thereof

A cathode material, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, battery pack components, etc., can solve the problems of inhibiting the ionic conductivity of lithium-sulfur batteries, and the inhibition is not effective enough, so as to inhibit the shuttle effect and avoid direct Contact, the effect of increasing the diffusion rate

Active Publication Date: 2017-08-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing report a kind of graphene improves positive electrode and barrier film and simultaneously improves 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 "sport 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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  • A lithium-sulfur battery positive electrode material, lithium-sulfur battery and preparation method thereof
  • A lithium-sulfur battery positive electrode material, lithium-sulfur battery and preparation method thereof
  • A lithium-sulfur battery positive electrode material, lithium-sulfur battery and preparation method thereof

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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 a positive electrode of a lithium-sulfur battery, a lithium-sulfur battery and a preparation method thereof, belonging to the field of battery materials. The center of the anode material is a functionalized carbon nanomaterial, the middle interlayer is sulfur, and the outer layer is a polydopamine film, and the functionalization is hydroxylation or carboxylation. The preparation method is as follows: dissolving carbon nanomaterials in alkali or acid solution to obtain functionalized carbon nanomaterials; adding functionalized carbon nanomaterials into sulfur source aqueous solution, stirring and adding dilute acid dropwise to obtain functionalized carbon coated with sulfur on the outside Nano material: add the functionalized carbon nano material coated with sulfur on the outside into tris(hydroxymethyl)methane buffer solution and polymerize with dopamine hydrochloride solution to obtain the positive electrode material. It also relates to a lithium-sulfur battery in which the positive electrode material is the positive electrode material; the battery can also contain a polydopamine-modified polyethylene diaphragm. The positive electrode material can inhibit the "shuttle effect" and structural damage caused by volume expansion; the lithium-sulfur battery has good cycle performance and capacity retention.

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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Patent Type & Authority Patents(China)
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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