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A long cycle life lithium-sulfur battery cathode material, cathode and its preparation and application

A technology for lithium-sulfur batteries and positive electrode materials, which is applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problem that the cycle performance is not well improved, and achieve a short preparation period, long cycle life, and prevention of dissolution. and diffusion effects

Active Publication Date: 2020-07-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The porous carbon material improves the conductivity of the electrode. Although the utilization rate of sulfur and the specific capacity of the battery are improved, its cycle performance has not been improved very well.

Method used

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  • A long cycle life lithium-sulfur battery cathode material, cathode and its preparation and application
  • A long cycle life lithium-sulfur battery cathode material, cathode and its preparation and application
  • A long cycle life lithium-sulfur battery cathode material, cathode and its preparation and application

Examples

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Effect test

Embodiment 1

[0050] A lithium-sulfur battery positive electrode material with high cycle characteristics and a preparation method for the lithium-sulfur battery positive electrode, comprising the following steps:

[0051] (1) 6 g of thiourea was dissolved in 150 mL of distilled water with magnetic stirring, and heated in a water bath at 50° C. to obtain a thiourea solution;

[0052] (2) Under the condition of stirring (260rpm), slowly add 8 mL of formaldehyde solution with a mass fraction of 38% to the thiourea solution in step (1), after the dropwise addition, add 1 mL of hydrochloric acid with a mass fraction of 37% solution, stirred and reacted for 4 hours, suction filtered, and vacuum-dried at 60°C for 12 hours to obtain thiourea-formaldehyde resin;

[0053] (3) Mix 2g of thiourea formaldehyde resin and 6g of ordinary sulfur powder evenly, heat to 150°C, stir at 260rpm for 2 hours (melting of sulfur powder), continue to heat up to 180°C, keep warm for 8 hours, cool, grind and dry , to...

Embodiment 2

[0060] A lithium-sulfur battery positive electrode material with high cycle characteristics and a preparation method for the lithium-sulfur battery positive electrode, comprising the following steps:

[0061] (1) 5 g of thiourea was dissolved in 120 mL of distilled water with magnetic stirring, and heated in a water bath at 60° C. to obtain a thiourea solution;

[0062] (2) Under the condition of stirring (280rpm), 7 mL of formaldehyde solution with a mass fraction of 38% was slowly added dropwise to the thiourea solution in step (1). After the addition, 0.8 mL of formaldehyde with a mass fraction of 37% hydrochloric acid solution, stirred and reacted for 4 hours, suction filtered, and vacuum-dried at 60°C for 10 hours to obtain thiourea-formaldehyde resin;

[0063] (3) Mix 1g of thiourea formaldehyde resin with 5g of ordinary sulfur powder evenly, heat to 150°C, stir at 260rpm for 1 hour (melting of sulfur powder), continue to heat up to 180°C, keep warm for 8 hours, cool, gr...

Embodiment 3

[0068] A lithium-sulfur battery positive electrode material with high cycle characteristics and a preparation method for the lithium-sulfur battery positive electrode, comprising the following steps:

[0069] (1) 6g of thiourea was dissolved in 150mL of distilled water and 1.5mL of hydrochloric acid solution with a mass fraction of 37% by magnetic stirring, and heated in a water bath at 50°C to obtain a thiourea solution;

[0070] (2) Under the condition of stirring (260rpm), 8mL of formaldehyde solution with a mass fraction of 38% was slowly added dropwise to the thiourea solution in step (1). After the dropwise addition, stirred and reacted for 4 hours, suction filtered, and ℃ vacuum drying for 18 hours to obtain thiourea-formaldehyde resin;

[0071] (3) Mix 2g of thiourea formaldehyde resin and 5g of ordinary sulfur powder evenly, heat to 150°C, stir at 280rpm for 1 hour (melting of sulfur powder), continue to heat up to 170°C, keep warm for 10 hours, cool, grind and dry ,...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and discloses a positive electrode material and a positive electrode with long cycle life for a lithium-sulfur battery as wellas preparation and application of the positive electrode. The positive electrode material for the lithium-sulfur battery is prepared by the following steps: (1) reacting thiourea with formaldehyde under the action of a catalyst by taking water as a reaction medium, and performing subsequent treatment to obtain a thiourea formaldehyde resin; (2) uniformly mixing ordinary sulfur powder with the thiourea formaldehyde resin, stirring at the temperature of 140 to 160 DEG C, continually raising the temperature to 170 to 190 DEG C, preserving heat for reacting, and performing subsequent treatment. The positive electrode is prepared by the following steps: uniformly mixing the positive electrode material, a conductive agent, a binder and an organic solvent to obtain slurry; coating a current collector with the slurry, drying and rolling to obtain the positive electrode. The positive electrode material and the positive electrode disclosed by the invention have long cycle life, higher specificcapacity and higher rate characteristic. The positive electrode is used for preparing the lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and relates to a high-energy-density, long-cycle-life lithium-sulfur battery positive electrode material, a positive electrode, and a preparation method and application thereof. The positive electrode material is used to prepare a positive electrode, and the positive electrode is used to prepare a high-performance lithium-sulfur battery. A lithium-sulfur battery, the lithium-sulfur battery has high cycle performance and long cycle life. Background technique [0002] Lithium-sulfur battery (Li~S Battery) has a specific energy density of 2600Wh / kg; the raw material elemental sulfur is cheap and earth resources are abundant; as a new energy technology, lithium-sulfur battery is environmentally friendly and other factors, so that it can adapt to various electronic products at this stage. The increasing demand for energy density of products can meet the design of high cruising range o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M4/1397H01M10/052
CPCH01M4/136H01M4/1397H01M4/362H01M4/5815H01M4/624H01M4/628H01M10/052Y02E60/10
Inventor 黎立桂曾帅波陈少伟
Owner SOUTH CHINA UNIV OF TECH
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