| The specific structure of graphene shows many advantages for anchoring lithium ion batteries material in view of its large surface area, good electrical conductivity and mechanical strength. So it provides many potential application in the area of lithium ion batteries.Olivine-structured LiFeP04has become a kind of widely used lithium ion batteries cathode material due to relatively high specific capacity, excellent cycle performance, good safety and environmental benignity. However, since the poor intrinsic conductivity and limitation on lithium ion diffusion, it’s difficult to utilize under high current density. To improve the rate performance and cycling stability of LiFeP04, graphene-modified LiFePO4composite has been developed as Li-ion battery cathode material. The composite is successfully prepared via a novel solvothermal route. C-LiFePO4/graphene, with structure of C-LiFeP04nanoparticles embedded in graphene matrix, exhibits excellent electrochemical properties, including superior high-rate capability and favorable charge-discharge cycle performance under relative high current density.As a kind of newly discovered supercapacitor material, Co3O4has attracted a lot of concerns for the relatively high specific capacity and cycle stability. But due to the low electronic conductivity and pulverization under high current density, the application in reality is still limited right away. In this experiment, the composite with structure of nano-Co3O4embedded in graphene matrix was successfully prepared through a novel hydrothermal route. Since the introduction of graphene could partly delay the pulverization due to the mechanical strength of graphene, so the electrochemical performance of the composite could be hugely improved.Compared to the total electrode amount, the proportion occupied by graphene was negligibly small, so it has little influence on the reduction of energy storage density, which was also economic for industry. |
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