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Preparation method of flexible sulfur positive electrode of lithium-sulfur battery

A technology for lithium-sulfur batteries and sulfur cathodes is applied in the field of preparation of flexible sulfur cathodes for lithium-sulfur batteries, which can solve the problems of lack of short-range electronic conductivity, limited binding capacity, and large pores of three-dimensional carbon skeleton.

Active Publication Date: 2020-10-30
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the pores of the three-dimensional carbon framework are too large and lack good short-range electronic conductivity.
In addition, due to the lack of strong polar substances that can both adsorb and catalyze the conversion of polysulfides, the binding ability of three-dimensional carbon materials to sulfur is limited, and the rate performance needs to be further improved.

Method used

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  • Preparation method of flexible sulfur positive electrode of lithium-sulfur battery
  • Preparation method of flexible sulfur positive electrode of lithium-sulfur battery
  • Preparation method of flexible sulfur positive electrode of lithium-sulfur battery

Examples

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Embodiment 1

[0023] The preparation method of the flexible multifunctional carbon foam of this embodiment comprises the following steps: soak the melamine foam in ethylene glycol for 6 hours, then ultrasonically treat it for 0.5 hour, wash it with distilled water for 3 times, and then dry it in a vacuum oven at 60°C 12h prepared carbon precursor, immersed in 100mL containing 1mM Co(NO 3 ) 2 ·6H 2 O and 1g of thiourea in ethanol solution, stir evenly, then ultrasonically treat until it is fully impregnated, in a nitrogen atmosphere at a heating rate of 3°C / min, first raise the temperature to 550°C and keep it for 2h, then raise the temperature to 800°C and keep it for 2h, then cool naturally to room temperature to obtain flexible multifunctional carbon foam.

[0024] The preparation method of the positive electrode of the lithium-sulfur battery of the present embodiment comprises the following steps: mixing the flexible multifunctional carbon foam prepared above with elemental sulfur powd...

Embodiment 2

[0027] The preparation method of the flexible multifunctional carbon foam of this embodiment comprises the following steps: soak the melamine foam in acetone for 3 hours, then ultrasonically treat it for 0.5 hour, wash it with distilled water for 3 times, and then dry it in a vacuum oven at 120°C for 8 hours. To obtain carbon precursor, immerse in 50mL containing 4mM CoCl 2 ·6H 2 O and 2g of thioacetamide in ethanol solution, stir well, then ultrasonically treat it until it is fully impregnated, in a nitrogen atmosphere at a heating rate of 3°C / min, first raise the temperature to 500°C and keep it for 1h, then raise the temperature to 850°C and keep it for 0.5h , naturally cooled to room temperature to obtain flexible multifunctional carbon foam.

[0028] The preparation method of the positive electrode of the lithium-sulfur battery in this embodiment includes the following steps: immerse the flexible multifunctional carbon foam prepared above in a carbon disulfide solution w...

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Abstract

The invention discloses a preparation method of a flexible sulfur positive electrode of a lithium-sulfur battery, and belongs to the technical field of lithium-sulfur batteries. The flexible sulfur positive electrode of the lithium-sulfur battery comprises flexible multifunctional carbon foam and a sulfur-containing active substance loaded in the flexible multifunctional carbon foam. The specificpreparation process comprises the steps of preparation of the flexible multifunctional carbon foam, preparation of the flexible sulfur positive electrode of the lithium-sulfur battery and the like. The synthesis method disclosed by the invention is simple and convenient to operate, relatively low in cost and suitable for large-scale production, and has important significance for large-scale production of the lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a method for preparing a flexible sulfur positive electrode of a lithium-sulfur battery. Background technique [0002] The booming field of flexible and wearable electronics has led to an urgent need to develop energy storage systems with good flexibility, high energy density, and long cycle life. Among the current options, lithium-sulfur batteries can meet the needs of the consumer electronics market due to their high theoretical specific capacity (1675mAh / g), wide source of positive active material sulfur, low price, and environmental friendliness due to the multi-electron conversion reaction. demand, is a very promising next-generation chemical power system. In particular, flexible lithium-sulfur batteries are very attractive because of their portability and applicability for different application scenarios. However, due to its own shortcomings t...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/58H01M10/052H01M4/1393H01M4/1397C01B32/158
CPCH01M4/362H01M4/583H01M4/625H01M4/5815H01M10/052H01M4/1393H01M4/1397C01B32/158Y02E60/10
Inventor 曹朝霞张振楠贾敬毅李昊瀚王宇贺宋高航杨明国
Owner HENAN NORMAL UNIV
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