Two-dimensional transition metal carbide (nitride) and nano sulfur particulate composite as well as preparation and application thereof

A technology of transition metals and composite materials, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of easy extraction of lithium polysulfide, poor conductivity of sulfur, large volume change, etc., to achieve Avoid the introduction of binders and conductive agents, reduce internal resistance, and have a large contact area

Active Publication Date: 2017-02-22
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, problems such as poor conductivity of the positive active material sulfur, large volume changes during charging and discharging, and lithium polysulfides formed during the process are easy to come out and dissolve in the electrolyte, causing the "shuttle effect" and other problems that need to be solved urgently.

Method used

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  • Two-dimensional transition metal carbide (nitride) and nano sulfur particulate composite as well as preparation and application thereof
  • Two-dimensional transition metal carbide (nitride) and nano sulfur particulate composite as well as preparation and application thereof
  • Two-dimensional transition metal carbide (nitride) and nano sulfur particulate composite as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Two-dimensional transition metal carbide Ti 3 C 2 Preparation of nanosheet suspension: 10 mL of dilute HCl with a concentration of 6M and 0.666 g of LiF were added to a plastic bottle, and 1 g of ternary layered carbide Ti passing through a 400-mesh sieve was slowly added under magnetic stirring. 3 AlC 2 powder, and magnetically stirred at 250r.p.m at 35°C for 22h. After the reaction, the product was washed with ethanol and centrifuged until the pH of the upper layer was 6.2. After the precipitate was dried at room temperature, 0.1g was added to 50mL deionized water. Under the protection of flowing argon, ultrasonic peeling at 40kHz ultrasonic frequency for 1h, followed by centrifugation at 3500r.p.m for 1h to obtain a few-layer or single-layer two-dimensional transition metal carbide Ti 3 C 2 A stable suspension of nanosheets, the concentration of the suspension is 0.6mg / ml.

[0030] (2) Two-dimensional transition metal carbide Ti 3 C 2 Preparation of composi...

Embodiment 2

[0033] (1) Two-dimensional transition metal carbide Ti 3 C 2 Preparation of nanosheet suspension: 10 mL of dilute HCl with a concentration of 6M and 0.666 g of LiF were added to a plastic bottle, and 1 g of ternary layered carbide Ti passing through a 400-mesh sieve was slowly added under magnetic stirring. 3 AlC 2 powder, and stirred under magnetic force at 30°C and 250r.p.m for 15h. After the reaction, the product was washed with ethanol and centrifuged until the pH of the upper layer was 6.3. After the precipitate was dried at room temperature, 0.2g was added to 150mL deionized water. Under the protection of flowing argon, ultrasonic peeling at 40kHz ultrasonic frequency for 1h, followed by centrifugation at 3500r.p.m for 1h to obtain a few-layer or single-layer two-dimensional transition metal carbide Ti 3 C 2 A stable suspension of nanosheets, the concentration of the suspension is 0.2mg / ml.

[0034] (2) Two-dimensional transition metal carbide Ti 3 C 2 Preparation ...

Embodiment 3

[0037] (1) Two-dimensional transition metal carbide Ti 3 C 2 Preparation of nanosheet suspension: 10 mL of dilute HCl with a concentration of 6M and 0.666 g of LiF were added to a plastic bottle, and 1 g of ternary layered carbide Ti passing through a 400-mesh sieve was slowly added under magnetic stirring. 3 AlC 2 powder, and stirred under magnetic force at 35°C and 300r.p.m for 24h. After the reaction, the product was washed with ethanol and centrifuged until the pH of the upper layer was 6.2. After the precipitate was dried at room temperature, 0.3g was added to 50mL deionized water. Under the protection of flowing argon, ultrasonic peeling at 80kHz ultrasonic frequency for 1h, followed by centrifugation at 3000r.p.m for 1h to obtain a few-layer or single-layer two-dimensional transition metal carbide Ti 3 C 2 A stable suspension of nanosheets, the concentration of the suspension is 1.1 mg / ml.

[0038] (2) Two-dimensional transition metal carbide Ti 3 C 2 Preparation ...

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Abstract

The invention relates to a two-dimensional transition metal carbide (nitride) and nano sulfur particulate composite as well as preparation and application thereof. The composite is formed by two-dimensional transition metal carbide (nitride) MXene nanosheets and nano sulfur particles, wherein the nano sulfur particles grow on the surface of the two-dimensional transition metal carbide (nitride) MXene nanosheets in an in-situ manner, marked as S@MXene. The stable suspension of a single layer or a few layers of two-dimensional transition metal carbide (nitride) MXene nanosheets is mixed with a sodium thiosulfate or sodium polysulfide solution; with formic acid as a reducing agent, the nano sulfur generated by the reaction uniformly grows on the surface of the two-dimensional MXene nanosheet; and the two-dimensional transition metal carbide (nitride) and nano sulfur particulate composite is obtained through neutralization, washing and centrifugation and serves as the anode of a lithium-sulfur battery. According to the invention, a high-conductivity two-dimensional transition metal carbide (nitride) MXene nanosheet carrier is uniformly compounded with nano sulfur particles, introduction of a binder and a conductive agent is not needed, and the composite has excellent electrochemical performance as the anode of a lithium-sulfur battery; and moreover, the technology is simple and can meet the requirements of large-scale production.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials, and in particular relates to a composite material of two-dimensional transition group metal carbide (nitride) compound and nanometer sulfur particles and its preparation and application. Background technique [0002] Lithium-sulfur (Li-S) battery is a new type of high-capacity energy storage system with great development prospects. It has outstanding advantages such as high theoretical energy density, low cost, and environmental protection. Its theoretical specific capacity is as high as 1675mAh g -1 , the theoretical specific energy density of the formed lithium secondary battery system can reach 2600Wh kg -1 , which is 7 times that of the current commercial lithium-ion battery, and shows broad application prospects in emerging technology fields such as power batteries for new energy vehicles. However, problems such as the poor conductivity of the positive electrode active mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/13H01M10/052B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/13H01M4/362H01M4/38H01M4/62H01M4/624H01M4/628H01M10/052Y02E60/10
Inventor 杨建唐欢杜飞潘丽梅冯永宝丘泰
Owner NANJING TECH UNIV
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