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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  • Abstract
  • Description
  • Claims
  • Application Information

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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,

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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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Example Embodiment

[0074] Example 1

[0075] Dissolve 2.0 g of carbon nanotubes in 80 mL of aqueous solution containing 6.0 g of sodium hydroxide, and hydrothermally react for 3 hours at 180°C in a closed environment to obtain reaction product 1. The reaction product 1 is centrifuged and separated to obtain a precipitate, which is washed with water to pH It is neutral to obtain functionalized carbon nanomaterials. Add 2g of functionalized carbon nanomaterials into 0.08mol sodium thiosulfate aqueous solution, stir evenly to obtain a mixed solution, add 0.2mol / L dilute hydrochloric acid dropwise at a rate of 20μL / min at 20℃, and the addition is complete After the reaction is completed at 20°C for 12 hours to obtain reaction product 2, the reaction product 2 is centrifuged and separated to obtain a precipitate, washed with water until the pH is neutral, and dried to obtain a sulfur-coated functional carbon nanomaterial. Add 2g of sulfur-coated functionalized carbon nanomaterial into a buffer solution...

Example Embodiment

[0085] Example 2

[0086] Dissolve 2.0 g of carbon nanospheres in 80 mL of aqueous solution containing 6.0 g of sodium hydroxide, and hydrothermally react for 3 hours at 180°C in a closed environment to obtain reaction product 1. The reaction product 1 is centrifuged and separated to obtain a precipitate, which is washed with water to pH It is neutral to obtain functionalized carbon nanomaterials. Add 2g of functionalized carbon nanomaterials into 0.08mol sodium thiosulfate aqueous solution, stir evenly to obtain a mixed solution, add 0.2mol / L dilute hydrochloric acid dropwise at a rate of 20μL / min at 20℃, and the addition is complete After the reaction is completed at 20°C for 12 hours to obtain reaction product 2, the reaction product 2 is centrifuged and separated to obtain a precipitate, washed with water until the pH is neutral, and dried to obtain a sulfur-coated functional carbon nanomaterial. Add 2g of sulfur-coated functionalized carbon nanomaterial into a buffer soluti...

Example Embodiment

[0096] Example 3

[0097] Take 2.0 g of graphene and dissolve it in 80 mL of aqueous solution containing 6.0 g of sodium hydroxide, and hydrothermally react for 3 hours at 180°C in a closed environment to obtain reaction product 1. The reaction product 1 is centrifuged and separated to obtain a precipitate, which is washed with water until the pH is Neutral to obtain functionalized carbon nanomaterials. Add 2g of functionalized carbon nanomaterials into 0.08mol sodium thiosulfate aqueous solution, stir evenly to obtain a mixed solution, add 0.2mol / L dilute hydrochloric acid dropwise at a rate of 20μL / min at 20℃, and the addition is complete After the reaction is completed at 20°C for 12 hours to obtain reaction product 2, the reaction product 2 is centrifuged and separated to obtain a precipitate, washed with water until the pH is neutral, and dried to obtain a sulfur-coated functional carbon nanomaterial. Add 2g of sulfur-coated functionalized carbon nanomaterial into a buffer ...

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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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