Bentonite/sulfur composite material as well as preparation method and application thereof

A technology of composite materials and bentonite, applied in the direction of active material electrodes, electrical components, battery electrodes, etc., can solve the problems of poor electrical conductivity and narrow ion transmission channels, and achieve the goal of improving electrical conductivity, efficient ion channels, and improving electrochemical performance Effect

Active Publication Date: 2020-12-18
INST OF CHEM ENG GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, one aspect of the present invention is to provide a bentonite / sulfur composite lithium-sulfur battery positive electrode material, which can solve the problems of poor conductivity and narrow ion transport channels in the bentonite / sulfur composite positive electrode

Method used

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  • Bentonite/sulfur composite material as well as preparation method and application thereof
  • Bentonite/sulfur composite material as well as preparation method and application thereof
  • Bentonite/sulfur composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 5g of bentonite to 50mL of 1M LiCl aqueous solution, stir at 60°C for 2h, filter, and wash the filter cake repeatedly with deionized water until no chloride ions exist in the washing liquid.

[0041] Add the washed filter cake to 500mL deionized water, stir for 1h to obtain a suspension with a mass fraction of 1wt%; heat the above suspension to 60°C, 3+ The ratio of / g bentonite, slowly add the polymerized hydroxyaluminum ion intercalation agent, stir while adding, continue to be 1:1 according to the ratio of chitosan and bentonite mass ratio, slowly add the concentration of 1wt% to the suspension Chitosan acetic acid solution (concentration of acetic acid is 1wt%), stir while adding, continue to stir at 60 ℃ for 6h after the acetic acid solution of chitosan is added, then stand and age at room temperature for 24h, filter, use deionized The filter cake was repeatedly washed with water until the washing solution became neutral, and then dried at 105° C. to obtain pol...

Embodiment 2

[0048] Compared with Example 1, the main difference is that at first the natural bentonite is subjected to sodium treatment.

[0049] Add 5g of bentonite to 50mL of 1M NaCl aqueous solution, stir at 60°C for 2h, filter, and wash the filter cake repeatedly with deionized water until no chloride ions exist in the washing liquid.

[0050] Add the washed filter cake to 500mL deionized water, stir for 1h to obtain a suspension with a mass fraction of 1wt%; heat the above suspension to 60°C, 3+ The ratio of / g bentonite, slowly add the polymerized hydroxyaluminum ion intercalation agent, stir while adding, continue to be 1:1 according to the ratio of chitosan and bentonite mass ratio, slowly add the concentration of 1wt% to the suspension Chitosan acetic acid solution (concentration of acetic acid is 1wt%), stir while adding, continue to stir at 60 ℃ for 6h after the acetic acid solution of chitosan is added, then stand and age at room temperature for 24h, filter, use deionized The...

Embodiment 3

[0056] Compared with Example 1, the main difference is that polymeric hydroxyl iron ions are used as the inorganic intercalation modifier.

[0057] Add 5g of bentonite to 50mL of 1M LiCl aqueous solution, stir at 60°C for 2h, filter, and wash the filter cake repeatedly with deionized water until no chloride ions exist in the washing liquid.

[0058] Add the washed filter cake to 500mL deionized water, stir for 1h to obtain a suspension with a mass fraction of 1wt%; heat the above suspension to 60°C, 3+ The ratio of / g bentonite, slowly add the polymeric hydroxyl iron ion intercalation agent, stir while adding, continue to be 1:1 according to the ratio of chitosan and bentonite mass ratio, slowly add the concentration of 1wt% to the suspension Chitosan acetic acid solution (concentration of acetic acid is 1wt%), stir while adding, continue to stir at 60 ℃ for 6h after the acetic acid solution of chitosan is added, then stand and age at room temperature for 24h, filter, use deio...

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Abstract

The invention discloses a bentonite / sulfur composite material as well as a preparation method and application thereof. The bentonite / sulfur composite material comprises bentonite, a conductive carbonintercalation layer derived from an inorganic intercalating agent and an organic intercalating agent between bentonite layers, conductive carbon at least partially covering the surface of the modifiedbentonite, and loaded sulfur. The bentonite / sulfur composite material provided by the invention has an efficient ion channel and conductive network structure, can improve the sulfur loading capacityof the positive electrode of the lithium-sulfur battery, promotes the transmission of ions / electrons in the positive electrode, and strengthens the electrochemical reaction kinetics in the positive electrode; therefore, the specific discharge capacity, the cycling stability and the rate capability of the composite positive electrode of the lithium-sulfur battery are effectively improved.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a bentonite / sulfur composite material and a preparation method and application thereof. Background technique [0002] With the rapid development of technologies such as portable electronic devices and electric vehicles, secondary battery technology with low cost, high energy density, and long cycle life has increasingly become the focus and hotspot of electrochemical energy storage research. The theoretical energy density of lithium-sulfur batteries is as high as 2600Wh / kg, and sulfur resources are abundant, cheap, and environmentally friendly, so they are considered to be one of the most potential secondary battery systems. However, lithium-sulfur batteries still have inherent problems such as the non-conductivity of the sulfur element and the final discharge product, the "shuttle effect" of lithium polysulfide (LiPS), and the volume effect of the sulfur cathode, and its pra...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M4/38H01M10/052
CPCH01M4/366H01M4/624H01M4/625H01M4/38H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 吴炼戴永强余越庞浩麦裕良廖兵
Owner INST OF CHEM ENG GUANGDONG ACAD OF SCI
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