Two-dimensional transition metal carbon (nitrogen) compound and two-dimensional transition metal sulfide nano-composite powder, and preparation and application thereof

A technology of nanocomposite powders and transition metals, applied in nanotechnology, nanotechnology, hybrid/electric double-layer capacitor manufacturing, etc., can solve structural instability, poor conductivity and poor cycle performance of two-dimensional transition metal sulfides and other issues, to achieve the effect of low cost, excellent electrochemical performance, and improved conductivity

Inactive Publication Date: 2017-04-19
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the accumulation of nanosheets during the charging and discharging process and the structural instability caused by the repeated deintercalation of Li ions, the single MoS 2 The cycle performance of the negative electrode is poor [Xiao J, Choi D W, Cosimbescu L, etal.Exfoliated MoS 2 nano composite as ananonode material for lithium ion batteries.Chem Mater,2010,22(16):4522-4524.] In addition, the conductivity of two-dimensional transition metal sulfides is generally poor, which also restricts their electrochemical performance and application an important factor of

Method used

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  • Two-dimensional transition metal carbon (nitrogen) compound and two-dimensional transition metal sulfide nano-composite powder, and preparation and application thereof
  • Two-dimensional transition metal carbon (nitrogen) compound and two-dimensional transition metal sulfide nano-composite powder, and preparation and application thereof
  • Two-dimensional transition metal carbon (nitrogen) compound and two-dimensional transition metal sulfide nano-composite powder, and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Two-dimensional transition metal carbide Ti 3 C 2 Preparation of nanosheet suspension: Add 10 mL of dilute HCl with a concentration of 6M and 0.662 g of LiF into a plastic bottle, and slowly add 1 g of ternary layered carbide Ti through a 400-mesh sieve 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 alcohol 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. figure 1 Shown is the 2D transition metal carbide Ti 3 C 2 AFM image of nanosheets, from which it can be...

Embodiment 2

[0031] (1) Two-dimensional transition metal carbide Ti 3 C 2 Preparation of nanosheet suspension: Add 10 mL of dilute HCl with a concentration of 6M and 0.662 g of LiF into a plastic bottle, and slowly add 1 g of ternary layered carbide Ti through a 400-mesh sieve under magnetic stirring. 3 AlC 2powder, and magnetically stirred at 33°C and 300r.p.m for 12h. After the reaction, the product was washed with alcohol and centrifuged until the pH of the upper layer was 6.3. After the precipitate was dried at room temperature, 0.1g was added to 50mL deionized water. Under the protection of flowing argon, ultrasonic stripping was performed at an ultrasonic frequency of 50kHz for 1.5h, and then centrifuged at a speed of 3800r.p.m for 1.2h 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 0.3mg / ml.

[0032] (2) Two-dimensional Ti 3 C 2 with 2D MoS 2 Preparation of nanoc...

Embodiment 3

[0035] (1) Two-dimensional transition metal carbide Ti 3 C 2 Preparation of nanosheet suspension: Add 10 mL of dilute HCl with a concentration of 6M and 0.662 g of LiF into a plastic bottle, and slowly add 1 g of ternary layered carbide Ti through a 400-mesh sieve under magnetic stirring. 3 AlC 2 powder, and magnetically stirred at 500r.p.m at 36°C for 23h. After the reaction, the product was washed with alcohol and centrifuged until the pH of the upper layer was 6.5. After the precipitate was dried at room temperature, 0.1g was added to 50mL deionized water. Under the protection of flowing argon, ultrasonic stripping was performed at an ultrasonic frequency of 80kHz for 0.8h, and then centrifuged at a speed of 3200r.p.m for 0.8h 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 0.9mg / ml.

[0036] (2) Two-dimensional Ti 3 C 2 with 2D MoS 2 Preparation of nanoc...

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Abstract

The invention relates to a two-dimensional transition metal carbon (nitrogen) compound and two-dimensional transition metal sulfide nano-composite powder, and a preparation and application thereof. The nano-composite powder is formed by the uniform scattered recombination of a two-dimensional transition metal carbon (nitrogen) compound nanosheet and a two-dimensional transition metal sulfide nanosheet, wherein the percentage of the mass of the two-dimensional transition metal sulfide to the total mass of the nano-composite powder is 10%-99%. The method comprises the steps: enabling the steady suspension liquid of the two-dimensional transition metal carbon (nitrogen) compound nanosheet and the suspension liquid of the two-dimensional transition metal sulfide nanosheet are mixed according to a proportion; carrying out cooling and drying after supersonic mixing, and then obtaining the nano-composite powder. The nano-composite powder is simple in preparation, is safe and high in efficiency, is low in cost, remarkably irons out the defects of conductivity of the two-dimensional transition metal sulfide, and can regulate the conductivity through proportion change. The nano-composite powder serves as a negative electrode of a lithium ion battery and the electrode material of a supercapacitor, is good in application prospect in the field of energy storage devices, and is better in electrochemical performance than the two-dimensional transition metal sulfide.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials, and in particular relates to a two-dimensional transition metal carbon (nitride) compound and two-dimensional transition metal sulfide nanocomposite powder and its preparation and application. Background technique [0002] Lithium-ion batteries have been widely used as power sources for portable electronic devices due to their high energy density and long cycle life. The current commercial lithium-ion batteries mainly use graphite as the negative electrode, but the theoretical capacity of graphite is low (372mAh / g), which makes it difficult for lithium-ion batteries to meet the requirements of some high energy density, high power density and other fields, especially new energy electric vehicles. application requirements. Electrode material is an important factor affecting the performance of lithium-ion batteries. Since the discovery of the two-dimensional carbon material graphen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/86H01M4/36H01M4/58B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01G11/30H01G11/86H01M4/364H01M4/58H01M4/5815Y02E60/10Y02E60/13
Inventor 潘丽梅杜飞张天杨建冯永宝丘泰
Owner NANJING TECH UNIV
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