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A lithium-sulfur battery cathode composite material based on macroporous adsorption resin and its preparation method

A technology of composite materials and lithium-sulfur batteries, which is applied in the field of battery cathode materials and secondary battery cathode materials, can solve the problems of unfavorable battery high rate performance, poor battery cycle performance, and affecting electrode stability, so as to suppress the shuttle effect and obtain Convenience, Inexpensive Effects

Active Publication Date: 2019-03-08
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the positive electrode of lithium-sulfur battery has the following three problems: (1) the conductivity of sulfur is poor, and the polarization of the battery is serious, resulting in low utilization rate of sulfur, which is not conducive to the high rate performance of the battery; (2) the charging of lithium-sulfur battery The polysulfides produced during the discharge process are easily soluble in the organic electrolyte, which gradually reduces the active material of the electrode, resulting in poor cycle performance and gradual attenuation of the capacity of the battery; (3) The volume of sulfur changes greatly during the charge and discharge process, which may affect Electrode stability, causing cycle instability and even safety issues

Method used

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  • A lithium-sulfur battery cathode composite material based on macroporous adsorption resin and its preparation method
  • A lithium-sulfur battery cathode composite material based on macroporous adsorption resin and its preparation method
  • A lithium-sulfur battery cathode composite material based on macroporous adsorption resin and its preparation method

Examples

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Embodiment 1

[0042] Pretreatment of polar macroporous adsorption resin: select a sample with a particle size of less than 2 μm, fully wash it with deionized water, then soak it in an HCl solution with a mass fraction of 10% for 2-3 hours, wash to neutral, and then use a mass fraction of Ultrasonic immersion in 5% NaOH solution for 2-3 hours, washing to neutrality, washing with 98% ethanol, suction filtration, and finally fully drying the obtained sample under vacuum conditions.

[0043] Mix the above-mentioned pretreated polar macroporous adsorption resin powder material with elemental sulfur at a ratio of 1:2, then place the material in a quartz boat, and heat it to 160°C at a heating rate of 2°C / min under vacuum conditions. h, maintain the vacuum condition and cool to 120°C, keep the temperature for 2h, maintain the vacuum condition and cool to room temperature. The sample was further ground and dried to obtain a sulfur-loaded material with a sulfur load of 66.7%.

[0044] Battery assem...

Embodiment 2

[0048] The process of pretreating the polar macroporous adsorbent resin powder is the same as in Example 1.

[0049] Dissolve 10g of glucose in 50mL of deionized water, heat it slightly to about 50°C to accelerate the dissolution, weigh 2g of the treated polar macroporous adsorption resin and add it to the above solution, stir it evenly, and then ultrasonicate it for 12h, then transfer it to the polymer In a tetrafluoroethylene-lined autoclave, tighten the lid, and conduct a hydrothermal reaction at 180°C for 6 hours. After cooling down to room temperature naturally, the lid of the kettle was opened, and the product in the kettle was transferred to a centrifuge tube. Add a large amount of deionized water to the centrifuge tube and stir evenly, then centrifuge at 3000rpm for 10min, pour off the upper layer liquid, add deionized water to wash twice, then use absolute ethanol to wash three times, repeat the operation several times, and finally put the sample under vacuum conditio...

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Abstract

The invention discloses a macroporous adsorptive resin based anode composite material for a lithium-sulfur battery and a preparation method thereof. When being applied as an anode material of the lithium-sulfur battery, the macroporous adsorptive resin based anode composite material for the lithium-sulfur battery has high first discharge mass specific capacity and excellent cycle performance. By using the macroporous adsorptive resin based anode composite material for the lithium-sulfur battery and the preparation method thereof, the dissolution of a polysulfide in the charge and discharge processes of a battery can be effectively inhibited; a shuttling effect can be inhibited; the cycle performance of the lithium-sulfur battery is improved. Further, according to the macroporous adsorptive resin based anode composite material for the lithium-sulfur battery and the preparation method thereof, the preparation process is simple; the prices of raw materials are low; the development of the lithium-sulfur battery is facilitated.

Description

technical field [0001] The invention relates to a lithium-sulfur battery cathode composite material based on a macroporous adsorption resin and a preparation method thereof, belonging to the field of battery cathode materials, in particular to the field of secondary battery cathode materials. Background technique [0002] With the increasingly serious environmental pollution and the aggravating energy crisis, finding and developing new cheap cathode materials with high specific capacity and high specific energy is a research hotspot at present. Elemental sulfur is considered to be one of the most promising cathode materials due to its high specific capacity, low price, and environmental friendliness. In lithium-sulfur batteries, lithium sheets are used as the negative electrode. The theoretical specific capacity of sulfur is as high as 1675mAh / g, and the theoretical energy density of the battery is as high as 2600Wh / kg. Compared with traditional lithium-ion batteries, lithi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 谢淑红程豪潘俊安袁国龙柴二亚高玉霞熊海龙
Owner XIANGTAN UNIV