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A preparation method of titanium carbide nanosheet/graphene composite material that can be used for lithium-ion battery negative electrode
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A technology for lithium ion batteries and composite materials, which is applied in the field of synthesis and preparation of nano-ceramic materials, can solve problems such as low efficiency and complex preparation process, and achieves the effects of high efficiency, wide application range and expanded application range.
Inactive Publication Date: 2017-07-28
HARBIN INST OF TECH
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[0006] The purpose of the invention is to solve the existing Ti 3 C 2 T x / graphene composite material preparation process complex and low efficiency, and provide a kind of preparation method of titanium carbide nanosheet / graphene composite material that can be used for lithium ion battery negative electrode
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specific Embodiment approach 1
[0023] Specific embodiment 1: This embodiment can be used for the preparation method of the titanium carbide nanosheet / graphene composite material of lithium-ion battery negative pole, realizes according to the following steps:
[0024] 1. Mix Ti, Al, and C powders according to the molar ratio of 3:(1.1~1.3):2, and synthesize Ti by pressureless sintering at 1400°C~1500°C 3 AlC 2 phase ceramics, and then pulverized to obtain Ti 3 AlC 2 powder;
[0025] Second, the Ti 3 AlC 2 The powder is corroded in hydrofluoric acid with a concentration of 20wt.% to 50wt.% for 4 to 24 hours. After corrosion, the solution is added to deionized water for centrifugation, and then the precipitate is dried to obtain stacked layered Ti 3 C 2 T x Powder;
[0026] 3. The layered Ti layer that will be stacked 3 C 2 T x The powder and the organic solvent are mixed according to the mass ratio of 1: (10-100), and then centrifuged to obtain a suspension;
[0027] 4. Take the supernatant of the...
specific Embodiment approach 2
[0032] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, Ti, Al, and C powders are mixed according to the molar ratio of 3:1.2:2, and Ti is synthesized by pressureless sintering at 1450°C. 3 AlC 2 phase ceramics. Other steps and parameters are the same as in the first embodiment.
specific Embodiment approach 3
[0033] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step two, Ti 3 AlC 2 The powder was corroded in 40wt.% hydrofluoric acid for 12 hours. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.
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Abstract
The invention relates to a preparation method for a titanium carbide nanosheet / graphene composite material capable of being used as an anode of a lithium ion battery, belonging to the field of synthesis and preparation of a nano ceramic material. The preparation method aims at solving the problems of complicated preparation process and low efficiency of the traditional Ti3C2T<x> / graphene composite material. The method comprises the following steps of: 1, preparing Ti3AlC2 powder; 2, preparing a stacked layered Ti3C2T<x> powder body; 3, preparing a suspension liquid; 4, taking the prepared layered Ti3C2T<x> powder body; and 5, combining with graphene oxide, and completing. According to the preparation method, only the Ti3C2T<x> powder body is needed to be prepared, the graphene oxide is taken as a raw material and can be directly bought in the market, the preparation period of the raw material is relatively short, and the surface of the graphene oxide also contains a functional group, is high in hydrophilic performance, and can be easily combined with the Ti3C2T<x>; and moreover, only one time of pumping filtration is required, efficiency is high, the process is simple, and the method has high promotion and application value.
Description
technical field [0001] The invention belongs to the field of synthesis and preparation of nano-ceramic materials, in particular to a method for preparing MXene composite materials. Background technique [0002] Ti 3 C 2 T x As a new type of two-dimensional material, its theoretical volume specific capacitance is much higher than that of all carbon materials, and it has great application prospects in lithium-ion batteries. Stripped Ti 3 C 2 T x The material can store more lithium ions than its multilayer structure, but due to the Ti 3 C 2 T x The phenomenon of sheet stacking limits its ability to store lithium ions; during the preparation process, Ti 3 C 2 T x It will chemically react with water and corrosive agents, resulting in the presence of functional groups on the surface, which seriously affects its electrical conductivity and also limits its application in lithium-ion batteries. Currently only Ti 3 C 2 T x Can be successfully prepared and tested for ele...
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