Effect of trace graphene coating on the electrochemical performance of LiNi0.8Co0.1Mn0.1O2
Graphene oxide(GO)was obtained by Hummers method and then prepared by reducing GO.LiNi0.8 Co0.1 Mn0.1 O2 cathode material was prepared by high temperature solid phase method.Graphene was added to ethanol solution and then mixed with the thickening dispersant sodium carboxymethyl cellulose(CMC)to obtain graphene solution.The surface of LiNi0.8 Co0.1 Mn0.1 O2 was coated with graphene solution by liquid phase self-aggregation method.Graphene/LiNi0.8 Co0.1 Mn0.1 O2 composites were characterized and tested by SEM,XRD and electrochemical testing systems.The results show that 0.8%-graphene/LiNi0.8 Co0.1 Mn0.1 O2 composites have the best performance.The maximum initial charge-discharge capacity reaches 222.85 mAh/g and 208.93mA/g,and the coulomb efficiency is 93.75%.
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