A kind of three-dimensional conductive network structure composite material and its preparation method and application
A network structure and composite material technology, applied in the field of three-dimensional conductive network structure composite materials and their preparation, can solve problems such as morphology collapse, unfavorable battery rate performance, and theoretical value gap
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[0040] The invention provides a preparation method of a three-dimensional conductive network structure composite material CNB-TiC@CNF / S, comprising the following steps:
[0041] (1) Ferric chloride hexahydrate, sodium hydroxide and deionized water are mixed at high temperature to obtain a mixed solution;
[0042] (2) The solution obtained in the step (1) is subjected to a hydrothermal reaction to obtain iron oxide;
[0043] (3) The iron oxide obtained in the step (2) is configured into a solution with titanium carbide, polyacrylonitrile and dimethylformamide, and a reddish-brown fiber film is obtained by electrospinning;
[0044] (4) performing secondary calcining treatment on the fiber membrane obtained in the step (3) to obtain a calcined product;
[0045] (5) immersing the calcined product obtained in the step (4) for etching treatment in a hydrochloric acid solution to obtain an etching product;
[0046] (6) Uniformly mixing the etching product obtained in the step (5) w...
Embodiment 1
[0090] (1) 270mmol sodium hydroxide and 170mmol ferric chloride hexahydrate were dissolved in 50mL deionized water respectively to obtain sodium hydroxide solution in ferric chloride solution;
[0091] (2) Mix the above two solutions under stirring at 92° C., and the mixing time is 5 minutes; after the mixing is completed, continue stirring for 5 minutes to obtain a suspension;
[0092] (3) Transfer the suspension to a hydrothermal reaction kettle for hydrothermal reaction, the temperature of the hydrothermal reaction is 100°C, and the time of the hydrothermal reaction is 24 hours;
[0093] (4) After the hydrothermal reaction is completed, cool the reactor to room temperature, and then centrifuge to obtain the precipitate; wash the precipitate twice with distilled water and absolute ethanol, and use a 50mL centrifuge tube to perform centrifugal washing at a speed of 10000rpm , 25-35 mL of water for each washing; vacuum-dry the washed precipitate at 60°C for 12 hours to obtain ...
Embodiment 2
[0111] The three-dimensional conductive network structure composite material CNB-TiC@CNF / S prepared in Example 1 and conductive carbon black and binder (PVDF) are configured into a uniform positive electrode slurry according to the ratio of mass ratio 8.5:0.5:1, Coated on aluminum foil, after drying and pressing, the sulfur loading of the obtained circular electrode sheet was 2.0, 3.8, 6.5 and 9.2 mg cm -2 ; The aluminum foil coated with the positive electrode slurry is cut into discs as the positive electrode; the positive electrode is sequentially combined with a separator, a metal lithium negative electrode and an electrolyte (ie 1mol L - 1 The solution of LiTFSI, the solvent of described solution is formed by mixing 1,3-dioxolane and ethylene glycol dimethyl ether with a volume ratio of 1:1, and contains a lithium nitrate solution with a mass ratio of 1%) Lithium sulfur battery.
[0112] Figure 10 a is the AC impedance spectrum of the lithium-sulfur battery, which is m...
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