Graphene/lithium titanium phosphate composite material, preparation method thereof and lithium ion battery
A lithium ion battery, lithium titanium phosphate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low capacity of lithium titanium phosphate negative electrode, limited energy storage application, etc., and achieve environmental friendliness, cost controllable, good The effect of electrochemical performance
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[0058] Example 1
[0059] Step A: According to the volume ratio of 1,3,5-trimethylbenzene to hydrochloric acid solution of 1:20, add 1,3,5-trimethylbenzene to 2.0mol / L hydrochloric acid solution, and continue stirring at 25°C for 30 minutes. Then, the mixture of 1,3,5-trimethylbenzene and hydrochloric acid solution was ultrasonically processed for 30 minutes to form an emulsion, where the ultrasonic frequency was 40 kHz.
[0060] Step B: At room temperature, add distilled water and 5.0 mg / mL graphene oxide solution to the emulsion according to the volume ratio of distilled water, graphene oxide solution, and emulsion 1:1.5:3, and let stand still After that, the precipitate was collected by vacuum filtration.
[0061] Step C: Mix the above precipitate with lithium titanium phosphate thoroughly (the mass ratio of graphene oxide to lithium titanium phosphate is 1:20), and place it in a quartz boat, place it in a tube furnace, 2 Under protection, the temperature is increased to 350°C at...
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[0062] Example 2
[0063] Step A: According to the volume ratio of toluene and hydrochloric acid solution of 1:50, toluene was added to 1.0 mol / L hydrochloric acid solution, and stirring was continued for 30 minutes at 25°C. Then, the mixture of toluene and hydrochloric acid solution was sonicated for 40 minutes to form an emulsion, where the ultrasonic frequency was 40 kHz.
[0064] Step B: At room temperature, add distilled water and 2.0 mg / mL graphene oxide solution to the emulsion according to the volume ratio of distilled water, graphene oxide solution, and emulsion 1:1:2, and let stand still After that, the precipitate was collected by vacuum filtration.
[0065] Step C: Mix the above precipitate with lithium titanium phosphate thoroughly (the mass ratio of graphene oxide to lithium titanium phosphate is 1:20), and place it in a quartz boat, place it in a tube furnace, 2 Under protection, the temperature is raised to 300°C at a heating rate of 15°C / min, the first stage sinteri...
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[0066] Example 3
[0067] Step A: According to the volume ratio of p-xylene, n-hexadecane and hydrochloric acid solution of 0.5:0.5:10, add p-xylene and n-hexadecane to 3.0mol / L hydrochloric acid solution, and stir continuously for 30 minutes at 25°C . Then, the mixture of p-xylene, n-hexadecane and hydrochloric acid solution was ultrasonically processed for 20 minutes to form an emulsion, where the ultrasonic frequency was 40 kHz.
[0068] Step B: At room temperature, add distilled water and 8.0 mg / mL graphene oxide solution to the emulsion according to the volume ratio of distilled water, graphene oxide solution, and emulsion 1:2:6, and let stand still After that, the precipitate was collected by vacuum filtration.
[0069] Step C: Mix the above precipitate with lithium titanium phosphate thoroughly (the mass ratio of graphene oxide to lithium titanium phosphate is 1:20), and place it in a quartz boat, place it in a tube furnace, 2 Under protection, the temperature is increased t...
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