NANOSTRUCTURED MATERIALS FOR ALKALIS ION BATTERIES AND THEIR MECHANISTIC STUDIES

To be comparable with combustion engine and practical for large-scale applications in smart grids, the energy density and the rate capability of LIBs and SIBs must be improved, which urges the exploitation of novel composite cathode or anode materials high specific capacity, high rate capability, especially stability and capacity retention when battery undergoes an extreme charging process as indicated recently. The first part of this thesis aims to demonstrate some new approaches in the design of composites of carbon matrixes / large capacity anodes, such as conversion metal oxides and lithium alloys. More than the significantly improved electrochemical profiles of these model composites, the correlation between structures and electrochemical profiles can be well-defined by means of various probes. In the last part, we aim to develop some long durability olivine cathodes for SIBs through some facile methods, whose electrochemical mechanism is investigated by operando XANES and XRD.

Author dc:creator

• TANG WEI

• lithium ion battery, sodium ion battery, electrode materials, mechanistic study, in-situ NMR, in-situ XAS