摘要：

In the present scenario, the requirement for an efficient and reliable energy storage device is of prime importance. Even though several energy storage devices are under consideration like supercapacitors, fuel cells etc. lithium ion batteries are more prioritized since the system is commercially available. The potential of lithium intercalation was initially proposed in 1975, but Sony first introduced commercial lithium ion battery in 1991. From the commercialization, researchers are focusing on the enhancement of specific capacity, rate capability, cycle stability, cost-effectiveness, safety and eco-friendly materials. Advancement in research have brought about an improvement in the performance, but still, the focus is pointed on to the development of a better system. Graphene has been extensively studied as electrode material in energy storage devices ever since the discovery, i.e. 2004 (which was awarded Nobel prize in 2010), owing to the flexibility, transparency, intercalation property etc. These two-dimensional nanosheets show a conductivity almost equivalent to that of metal and is known to have a quasi-metallic conductivity. Simulation studies on lithium ion insertion of graphene revealed that dual Li + can be intercalated on either face of the six-membered hexagonal carbon ring of graphene enhancing the capacitance of battery compared to the currently employed graphite sheets. Metal oxide composite preparation will result in a synergistic performance of both the compounds further enhancing the properties of the base materials. TiO 2 -graphene composite is a widely investigated metal oxide-based composite of graphene owing to their surplus performance than individual systems.

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