The method for preparing graphene conductive agent slurry with graphite tailings
A technology of graphite tailings and graphene, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of graphite tailings backlog and large amount of production, and achieve the effects of improving cycle life, increasing conductivity, and process control.
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example 1
[0029] Take 200kg of graphite tailings and first use the Φ1500 rotary vibrating screen produced by Xinxiang Gaofu Screening Equipment Co., Ltd. to pass through a 100-mesh sieve. The largest particle is less than 15um, and then put the tailings into the PP reaction tank produced by Anqiu Kehua Glass Steel Factory. Add 80kg of hydrofluoric acid, 120kg of hydrochloric acid, 40kg of S nitric acid and 240kg of pure water in proportion, start stirring, fully mix and stir the materials, and feed steam to continue heating for 12 hours, then add a large amount of pure water to cool the materials to room temperature, and then The mixed material is put into a centrifuge through a pipeline to deacidify first, then the material is washed with deionized water until neutral, and dehydrated to obtain a graphite filter cake with a water content of 15-25%.
[0030] Add the above water-containing graphite filter cake into the graphite oxide reaction tank lined with tetrafluoroethylene layer produ...
example 2
[0039] Take 500kg of graphite tailings and pass through a 100-mesh sieve using a Φ1500 rotary vibrating screen produced by Xinxiang High Frequency Screening Equipment Co., Ltd., then put the tailings into the PP reaction tank produced by Anqiu Kehua FRP Factory, and add hydrogen and fluorine in proportion 200kg of acid, 300kg of hydrochloric acid, 100kg of nitric acid and 600kg of pure water, start stirring, fully mix and stir the materials evenly while passing steam for 12 hours, then add a large amount of pure water to cool the materials to room temperature, and then put the mixed materials through the pipeline Put it into a centrifuge to deacidify first, then wash the material with deionized water to neutrality, and obtain a graphite filter cake with a water content of 15-25% after dehydration.
[0040] Add the above water-containing graphite filter cake into the graphite oxide reaction tank lined with tetrafluoroethylene layer produced by Wuxi Deflon Chemical Equipment Co.,...
Embodiment
[0045] The production of graphene conductive agent positive electrode sheet:
[0046] Graphene paste: PVDF: LiCoO 2 = 3:5:93 mixed in proportion, first mix the graphene conductive agent slurry and PVDF according to the above ratio, then add a certain proportion of N-methylpyrrolidone, ultrasonically disperse for 60min, and then LiCoO 2 Add it into a mixer and stir at 2000rpm for 4 hours to make a slurry. Use a coating machine to evenly coat the prepared battery slurry on aluminum foil, and dry it in a vacuum oven at 120°C for more than 8 hours. and rolled into graphene / LiCoO 2 Positive sheet. Then, the 18650 cylindrical battery was prepared by sequential winding, liquid injection and packaging of the cut piece, the separator and the negative electrode sheet, and the electrochemical performance test was carried out. Production of negative electrode sheet: graphene conductive agent slurry: negative electrode material MCMB: binder SBR: thickener CMC = 2:94:2.5:1.5 Add to the m...
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