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Two-dimensional layered titanium carbide/metal ion composite material and application thereof

A metal ion, two-dimensional layered technology, which is applied in the field of two-dimensional layered titanium carbide/metal ion composite materials, can solve the problems that restrict the large-scale application of lithium-ion batteries, cumbersome preparation process, and few practical applications, and achieve rich surface The effect of active groups, good cycle performance, and simple preparation method

Inactive Publication Date: 2015-08-26
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] So far, the research on two-dimensional titanium carbide materials is mainly in theoretical research, and there are few practical applications, especially in the field of lithium-ion batteries.
Although the theoretical specific capacity of commercial lithium-ion batteries can reach 250Wh / kg, it is limited by factors such as cumbersome preparation of negative electrode materials, poor safety, low specific capacity, and fast decay. Conventional carbon materials (theoretical specific capacity is only 372mAh / kg) g) The actual specific capacity of the lithium-ion battery constructed for the negative electrode is only 120-200Wh / kg, which directly restricts the large-scale application of lithium-ion batteries in the fields of large capacity and high power

Method used

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  • Two-dimensional layered titanium carbide/metal ion composite material and application thereof
  • Two-dimensional layered titanium carbide/metal ion composite material and application thereof
  • Two-dimensional layered titanium carbide/metal ion composite material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 1g Ti 3 AlC 2 Put the powder into a plastic beaker, add 20ml of HF solution with a mass fraction of 10%, and soak for 2h. Then the soaked powder was centrifuged, washed with deionized water until neutral, and baked in a blast oven at 80°C for 6 hours. The dried Ti 3 C 2 Powder, soak in 0.1mol / L sodium hydroxide solution for 8 hours, centrifuge, wash with deionized water until neutral, and dry. Ti 3 C 2 Soak the powder in 100ml of 0.05mol / L nickel nitrate solution, add 0.01g of surfactant PVP (polyvinylpyrrolidone) to soak for 12h, centrifuge, wash until neutral, and dry.

[0030] With the two-dimensional Ti prepared in Example 1 3 C 2 / Metal ion composite material powder is prepared as an electrode by the following method.

[0031] Weigh Ti respectively with a mass ratio of 80:10:10 3 C 2 / Metal ion composite material: super-P:PVDF, the electrode is made after uniform grinding, the metal lithium sheet is the positive electrode, and the electrolyte is 1mo...

Embodiment 2

[0033] Take 2g Ti 3 AlC 2 Put the powder into a plastic beaker, add 10ml of HF solution with a mass fraction of 30%, and soak for 8h. Then the soaked powder was centrifuged, washed with deionized water until neutral, and baked in a blast oven at 80°C for 24 hours. The dried Ti 3 C 2 Powder, soak in 5mol / L potassium hydroxide solution for 12h, centrifuge, wash until neutral, and dry. Ti 3 C 2 Soak the powder in 150ml of 0.2mol / L ferric chloride solution, add 2g of surfactant CTAB (cetyltrimethylammonium bromide) at the same time, soak for 24h, centrifuge, wash until neutral, and dry. The prepared two-dimensional titanium carbide / metal ion composite material is used to make electrodes according to the method of Example 1, and assembled into a lithium-ion battery. The discharge capacity after 50 cycles at a current density of 100ma / g is close to 415mAh / g. Good performance.

Embodiment 3

[0035] Take 4g Ti 3 AlC 2Put the powder into a plastic beaker, add 12.5ml of HF solution with a mass fraction of 70%, and soak for 48h. Then the soaked powder was centrifuged, washed with deionized water until neutral, and baked in a blast oven at 80°C for 12 hours. The dried Ti 3 C 2 Powder, soak in 0.3mol / L lithium hydroxide solution for 24h, centrifuge, wash until neutral, and dry. Then the dried Ti 3 C 2 Soak the powder in 200ml of 5mol / L tin chloride solution, add 3g of PVP (polyvinylpyrrolidone) at the same time, soak for 17h, centrifuge, wash until neutral, and dry. With the obtained two-dimensional titanium carbide / metal ion composite material, an electrode is made according to the method of Example 1, and a molded lithium ion battery is assembled, and the discharge capacity after 50 cycles at a current density of 100ma / g is close to 425mAh / g, Good cycle performance.

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Abstract

The invention discloses a two-dimensional layered titanium carbide / metal ion composite material and an application thereof. The composite material comprises a two-dimensional layered titanium carbide carrier and a metal ion compound loaded on the surface and between layers of the carrier. A preparation method of the composite material comprises the following steps of (1) taking a Ti3AlC2 material, treating the Ti3AlC2 material with a hydrofluoric acid solution to obtain Ti3C2 powder, (2) performing alkali treatment on the Ti3C2 powder obtained in Step (1) to obtain Ti3C2 powder subjected to the alkali treatment, and (3) treating the Ti3C2 powder subjected to the alkali treatment in a solution containing metal salt and a surfactant to obtain the two-dimensional layered titanium carbide / metal ion composite material. When the two-dimensional layered titanium carbide / metal ion composite material serves as a cathode material of a lithium ion battery, the capacity of the cathode material of the lithium ion battery can be greatly improved; and the cycle performance is good, so that high capacity and the capability of continuous charging and discharging under heavy current density are met.

Description

(1) Technical field [0001] The invention relates to a two-dimensional layered titanium carbide / metal ion composite material and its application as a lithium ion battery negative electrode material. (2) Background technology [0002] The two-dimensional titanium carbide material is a new two-dimensional layered transition metal C / N compound synthesized by the Barsoum research group of Drexel University in the United States in 2011. The single-layer thickness of the two-dimensional titanium carbide material is less than 1 nanometer, while the lateral dimension can reach 10 microns, the resistivity is similar to that of graphene, and the conductivity is good. At present, researchers prepare two-dimensional titanium carbide materials mainly by exfoliating titanium aluminum carbon materials with HF acid. For example Two-Dimensional Nanocrystals Produced by Exfoliation of Ti reported by Michael Naguib etc. 3 AlC 2 (Adv. Mater. 2011, 23, 4248–4253). [0003] So far, the researc...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/364H01M4/624H01M10/0525Y02E60/10
Inventor 罗剑敏徐飞强陶新永夏阳黄辉梁初甘永平张文魁
Owner ZHEJIANG UNIV OF TECH
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