A kind of graphene composite graphite negative electrode material and its preparation method and application
A graphene composite, graphite anode technology, applied in battery electrodes, structural parts, electrical components and other directions, can solve the problems of poor cycle stability, large irreversible capacity, no stable voltage platform, etc., to achieve low process cost and improve electrochemical performance. Effect
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Embodiment 1
[0088] The present embodiment provides a kind of graphene-graphite composite material and preparation method thereof, comprising:
[0089] 1. Preparation of Graphene
[0090] a. Mix 10 g of graphite and 5 g of potassium permanganate powder evenly, add 50 g of concentrated sulfuric acid (80 wt %), stir evenly, and react at room temperature for 12 h.
[0091] b. The obtained suspension was washed with dilute hydrochloric acid (6wt%), then washed repeatedly with deionized water three times, and filtered to obtain a filter cake.
[0092] c. Put the obtained product back into the reactor for reaction, add 12.5g of concentrated sulfuric acid (80wt%), 10g of hydrogen peroxide, stir evenly, and react at room temperature for 3h.
[0093] d. The resulting suspension was washed with dilute hydrochloric acid (6wt%), and then repeatedly washed with deionized water three times. The pH value was measured to be between 6-7.5, and filtered to obtain a filter cake.
[0094] e. The obtained pr...
Embodiment 2
[0103] The present embodiment provides the application of the graphene-graphite composite material prepared by embodiment 1 as the negative electrode material active material of lithium ion battery, which comprises the following steps:
[0104]a. Mix and stir the graphene-graphite composite material prepared in 0.4g embodiment 1 with 0.714g polyvinylidene fluoride solution (PVDF, 7wt%) and 0.05g carbon black to make negative electrode material, wherein, graphene-graphite The composite material is used as the active material, polyvinylidene fluoride is used as the binder, and carbon black is used as the conductive agent.
[0105] b. Apply the above-mentioned negative electrode material evenly on the aluminum foil with a scraper, and dry it to obtain the positive electrode of the lithium-ion battery; in a glove box filled with an argon atmosphere, the positive electrode, lithium sheet, diaphragm and electrolyte are assembled according to the battery assembly process Assembled in...
Embodiment 3
[0108] The present embodiment provides a kind of graphene-graphite composite material and preparation method thereof, comprising:
[0109] 1. Preparation of Graphene
[0110] a. Mix 10g of graphite, 5g of potassium permanganate, 5g of magnesium sulfate and 5g of sodium persulfate evenly, add 50g of concentrated sulfuric acid (80wt%), stir evenly, and react at room temperature for 12h.
[0111] b. The resulting suspension was washed with hydrochloric acid (6 wt %), and then repeatedly washed three times with deionized water, and filtered to obtain a filter cake.
[0112] c. Put the obtained product back into the reactor for reaction, add 12.5g of concentrated sulfuric acid (80wt%), 10g of hydrogen peroxide, stir evenly, and react at room temperature for 3h.
[0113] d. The obtained suspension was washed with hydrochloric acid (6wt%), and then repeatedly washed with deionized water three times to measure the pH value between 6-7.5, and then filtered to obtain a filter cake.
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