Composite graphene conductive agent for lithium battery and preparation method

Composite graphene conductive agent for lithium battery and preparation method

  • CN 106,058,264 A
  • Filed: 07/29/2016
  • Published: 10/26/2016
  • Est. Priority Date: 07/29/2016
  • Status: Active Application
First Claim
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1. the preparation method of a lithium battery graphene composite conductive agent, it is characterised in that:

  • preparation method is as follows;

    (1) by graphite powder, microcrystalline grain, extender mix homogeneously, with the mixed at high speed of 500-1200rpm in high-speed mixer30-45min, high mixing temperature controls at 40-45 DEG C, and extender inserts the interlayer of graphite after melting, obtain pre-intercalated compound,Wherein said microcrystalline grain is three cobalt oxides and the complex of carborundum that particle diameter is less than 100nm, and described extender is carbamide;

    (2) the pre-intercalated compound that step (1) is obtained, 100-150 DEG C, heat homogenizing 0.5-1 hour under anoxia condition,Extender expands and reacts the equal compound of formation with the bed boundary of graphite, sends into grinder grinding distribution 10-30min after cooling;

    (3) equal compound step (2) obtained sends into air-flow stripping machine, and jet mill is that circulating cyclonic airflow is pulverizedMachine, by circulating cyclonic jet mill is passed through compressed gas, control gas flow is 1-2m3/ min, gas pressureFor 1-1.5MPa, equal compound circulates to pulverize along the pulverizing chamber of jet mill tubulose under the effect of high velocity air to be peeled off, graphiteSplitting is Graphene, and inlays with microcrystalline grain complete layer, and the material meeting Particle size requirements moves with the form of eddy flow and entersRow classification is discharged from discharging opening, then carries out, with the copper mesh of 200 mesh, process of sieving, and i.e. can get granular lithium battery Graphene multipleClose conductive agent.

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