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Li-rich layered oxides (LLOs) are considered as one of the most promising cathode candidates for next-generation lithium-ion batteries. Unfortunately, their development is challenging, due to the detrimental structure changes and voltage decay that resulted from irreversible oxygen redox and transition metal (TM) migration. This thesis focuses on studying the structural evolution of Co-free LLO cathodes and improving their electrochemical performance. The mechanistic behaviour of Li1.2Ni0.2Mn0.6O2 (LNMO) was comprehensively studied using a series of synchrotron-based characterizations. An intr...

Solid-state batteries could potentially not only deliver twice as much energy for their size, they also could virtually eliminate the fire hazard associated with today’s lithium-ion batteries. However, instabilities at the boundary between the solid electrolyte layer and the two electrodes on either side can dramatically shorten the lifetime of...

In the never-ending quest to store maximum energy into batteries without compromising their volume or weight, solid-state battery stands out as a promising technology.

Abstract Phase transition is common during (de)-intercalating layered sodium oxides, which directly affects the structural stability and electrochemical performance. However, the artificial control of phase transition to achieve advanced sodium-ion batteries is lacking, since the remarkably little is known about the influencing factor relative to the sliding process of transition-metal slabs upon sodium release and uptake of layered oxides. Herein, we for the first time demonstrate the manipulation of oxygen vacancy concentrations in multinary metallic oxides has a significant impact on the r...