Positive electrode for lithium sulfur batteries, preparation and application thereof

A lithium-sulfur battery and electrode technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of poor electronic conductivity and ion conductivity of elemental sulfur, poor cycle performance of lithium-sulfur batteries, and volume expansion of sulfur electrodes, etc., to reduce the interface Resistance, suppression of conductivity deterioration, and uniform distribution effect

Active Publication Date: 2015-06-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of poor cycle performance of lithium-sulfur batteries, the present invention uses a mixture of gelatin and starch as the electrode binder, and yeast as the pore-forming agent. The intermediate product lithium polysulfide (Li 2 S x ,

Method used

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  • Positive electrode for lithium sulfur batteries, preparation and application thereof
  • Positive electrode for lithium sulfur batteries, preparation and application thereof
  • Positive electrode for lithium sulfur batteries, preparation and application thereof

Examples

Experimental program
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Embodiment 1

[0025] a. Heat and stir the gelatin in deionized water for 1 h, the concentration of the gelatin aqueous solution is 7 wt %, and the heating temperature is 80° C. to obtain the gelatin aqueous solution.

[0026] b. Heat and stir the starch in deionized water for 0.5 h, the concentration of the starch aqueous solution is 10 wt %, and the heating temperature is 90° C. to obtain the starch aqueous solution.

[0027]c. Add the starch aqueous solution to the prepared gelatin aqueous solution while heating and stirring, the mass ratio of gelatin and starch is 4:21, the concentration of the gelatin starch mixed aqueous solution is 15wt%, the heating temperature is 80°C, and the stirring time is 0.5h to obtain gelatin Starch mixed solution.

[0028] d Add the gelatin starch mixed solution as an electrode binder to the carbon-sulfur composite, add deionized water, heat and stir for 2 hours, the mass ratio of the carbon-sulfur composite to the binder is 9:1, and the heating temperature ...

Embodiment 2

[0036] a. Heat and stir the gelatin in deionized water for 1 h, the concentration of the gelatin aqueous solution is 7 wt %, and the heating temperature is 80° C. to obtain the gelatin aqueous solution.

[0037] b. Heat and stir the starch in deionized water for 0.5 h, the concentration of the starch aqueous solution is 10 wt %, and the heating temperature is 90° C. to obtain the starch aqueous solution.

[0038] c. Add starch aqueous solution to the prepared gelatin aqueous solution while heating and stirring, the mass ratio of gelatin and starch is 1:4, the concentration of gelatin starch mixed aqueous solution is 15wt%, the heating temperature is 80°C, and the stirring time is 0.5h to obtain gelatin Starch mixed solution.

[0039] d Add the gelatin starch mixed solution as an electrode binder to the carbon-sulfur composite, add deionized water, heat and stir for 2 hours, the mass ratio of the carbon-sulfur composite to the binder is 9:1, and the heating temperature is 80°C ...

Embodiment 3

[0047] a. Heat and stir the gelatin in deionized water for 1 h, the concentration of the gelatin aqueous solution is 7 wt %, and the heating temperature is 80° C. to obtain the gelatin aqueous solution.

[0048] b. Heat and stir the starch in deionized water for 0.5 h, the concentration of the starch aqueous solution is 10 wt %, and the heating temperature is 90° C. to obtain the starch aqueous solution.

[0049] c. Add starch aqueous solution to the prepared gelatin aqueous solution while heating and stirring, the mass ratio of gelatin and starch is 6:19, the concentration of gelatin starch mixed aqueous solution is 15wt%, the heating temperature is 80°C, and the stirring time is 0.5h to obtain gelatin Starch mixed solution.

[0050] d Add the gelatin starch mixed solution as an electrode binder to the carbon-sulfur composite, add deionized water, heat and stir for 2 hours, the mass ratio of the carbon-sulfur composite to the binder is 9:1, and the heating temperature is 80°C...

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Abstract

The invention relates to a positive electrode for lithium sulfur batteries, preparation and application thereof. The positive electrode includes a carbon sulfur compound, a binder, and a pore forming agent. The binder is a mixture of gelatin and starch in a mass ratio of (1-80):(20-99), the pore forming agent is yeast, the carbon sulfur compound and the binder are in a mass ratio of 8-9.5:0.5-2, and mass ratio of the yeast to the mixture of gelatin and starch is 1-10:90-99. The positive electrode provided by the invention adopts gelatin, starch and yeast as the raw materials, and the raw materials are wide and easy for mass production. Also, the method involves no toxic and harmful reagent, has no pollution, is environment-friendly, convenient and easy to learn, and has good reproducibility. In addition, the manufacturing cost is low, and the efficiency is high.

Description

technical field [0001] The invention belongs to the field of electrode materials for lithium-sulfur batteries, in particular to a lithium-sulfur battery electrode positive electrode. Background technique [0002] Nowadays, problems such as environmental pollution, greenhouse effect, and energy crisis are becoming more and more serious in the world. Secondary batteries with high specific energy are of great significance for solving outstanding energy and environmental problems. Among them, the lithium-ion battery is one of the batteries with the highest specific energy in the secondary battery. However, in the lithium-ion secondary battery system, the specific capacity and cycle performance of the cathode material need to be further optimized. Traditional cathode materials such as LiCoO 2 / Graphite and LiFePO 4 The theoretical energy density of the / graphite system is about 400Wh / kg. Due to the limitation of its theoretical energy density, it is determined that even if ...

Claims

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Application Information

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IPC IPC(8): H01M4/137H01M4/1399
CPCY02E60/10
Inventor 马艺文张华民张洪章张益宁王美日王倩曲超
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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