In Situ Synthesis of SnO2/Graphene Nanocomposite Anode and Its Enhanced Li?-ion Battery Performance

摘要

Rechargeable Li-ion batteries are aroused a lot of interest because of their high voltage, high energy density, stable cycling, and environmental-friendly properties. Nowadays, the continuous miniaturization of electronic devices such as implantable medical devices, smartcards, microelectromechanical systems (MEMS), remote sensors, and RFID tags is led to the growing demands of micropower sources. Rechargeable microbatteries are recently become the topic of widespread research for use in low power applications and energy storage systems for electronic devices. The general requirements of the microbatteries for these applications are high specific energy, wide range of temperature stability, low self-discharge rate and flexibility of cell design. SnO2 is very attractive electrode material because of its high theoretical capacity (1491 mAhg~(-1) ), good cyclability and high columbic efficiency. During charge/discharge process, volume expansion and pulverization have occurred in the SnO2 electrodes materials in addition to their superior properties. To overcome this problem, forming composite structure with carbon based materials is a efficiency way. Carbon with different forms (graphene, carbon nano tube, carbon fiber etc.) is suitable materials in electrochemistry applications because of its mechanical properties and its high chemical stability in acidic or basic solutions at a wide temperature range.