内容摘要：

Large capacity, high power density and low cost energy storage is critical for the electrification of the transportation and energy infrastructures. Recently, many types of rechargeable battery technologies such as aqueous lead-acid batteries based on conversion reactions and organic lithium ion batteries (LIBs) based on intercalation have been developed. However, they both suffer from severe power loss and slow charging at low temperatures. Meanwhile, severe voltage drop at low temperatures could be also detrimental to some electric applications (such as electric vehicles) and cause safety hazards. In this work, we have achieved high-rate performance of sodium ion batteries by utilizing electrode materials with Na Super Ionic Conductor (NASICON) crystalline structure. A designed NASICON structured carbon-coated Na3V2(PO4)3 (NVP@C) nanocomposite exhibits an excellent performance at high rates in a wide temperature range (i.e., from 20 to 55 °C). Even at a low temperature of 20 °C, the NVP@C cathode can still maintain a discharge capacity of 91.3 mA h g1 or 85.2% of the room performance at 10C, and secure an average output voltage of 2.86 V (vs. Na+/Na). These excellent wide temperature accomplishments can be ascribed to fast three-dimensional Na+ hopping transportation mechanism in the NASICON structure. The finding in this work offers a promising strategy to address the long-standing inherent wide-temperature issues of rechargeable batteries and extends the potential application of sodium ion batteries.

报告人简介：

Prof. Eddie Shanqing Zhang obtained his PhD degree in electrochemistry in 2001 at Griffith University, Australia. Since then, he has been working on synthesis, modification, characterisation of nanostructured materials for sensing, energy conversion and energy storage devices. As an inventor, Eddie has developed a series of patented and commercialized photoelectrochemical sensors for environmental monitoring based on the functional nanomaterials. He was awarded Australia Research Council Future Fellow in photoelectrocatalysis for 2009-2013, Pro-Vice Chancellor Award for mid-Career Researcher 2015 and Vice Chancellor Award for Senior Researcher 2016. Currently, Eddie is leading his group in research on energy conversion, energy storage and environmental monitoring, specialized in functional binders for low cost, sustainable and high capacity energy storage devices and nanomaterials for low temperature sodium ion batteries.