Advances in developing affordable batteries are vital for integrating renewable and environmentally friendly energy sources into the power grid. Benefiting from the abundance of sodium resources, sodium-ion batteries (SIBs) have attracted great attention as one of the most promising energy storage and conversion devices for grid-scale energy storage systems. From this perspective, we present a succinct and critical survey of the emerging electrode materials, such as layered transition-metal oxides, polyanionic compounds, Prussian blue analogue cathode materials, and hard carbon anode materials, that have potential value for large-scale applications.

His research interests include modeling and control of grid-integrated power converters, in particular on stability analysis and control of grid-connected renewable generations in electromagnetic timescale. Her research interests include dynamic modeling, stability analysis and control of power system with multi power converters.

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With widely application of voltage source converters (VSCs) in power system, DC-bus voltage control instabilities increasingly occurred in practical conditions, especially in weak AC grid, which poses challenges on stability and security of power converters applications. This paper aims to give physical insights into stability of DC-bus voltage control affected by ACbus voltage control in VSC connected to weak grid. Concepts of damping and restoring components are developed for DC-bus voltage to describe stability of DC-bus voltage control. Impact of AC-bus voltage control on DC-bus voltage control stability can be revealed by investigating impact of AC-bus voltage control on damping and restoring components essentially. Furthermore, detailed analysis for impact of AC-bus voltage control on damping and restoring components are presented with considering varied AC system strengths, operating points, and AC-bus voltage control parameters. Simulation results from 1.5-MW full-capacity wind power generation system are demonstrated which conform well to the analysis. Finally the experiment results validate the analysis. Index Terms-DC-bus voltage control, AC-bus voltage control,small-signal stability, voltage source converter, weak grid. . His current research interests include gridintegration of large-scale renewables, modular multilevel converter (MMC) for HVDC applications, and transient analysis and control of semiconducting power systems. Dr. Hu is the author/coauthor of more than 70 peer-reviewed technical papers and one monograph "Control and Operation of Grid-Connected Doubly-Fed Induction Generators", and holds more than 20 issued/pending patents. Her research interests include dynamic modeling, stability analysis and control of power system with multi power converters.Dong Wang was born in Huanggang, Hubei, China, in 1988. He received the B. Eng. and M. Eng. degree from Huazhong University of Science and Technology in 2012 and 2015, respectively. He is currently working toward the Ph.D. degree in the Department of Electrical and Electronic Engineering at The University of Hong Kong. His research interests include modeling and control of wind turbines, in particular on small signal stability analysis and control of grid-integrated DFIG-based Wind Turbines in electromagnetic timescale.

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