• Intercalation-host materials (layered oxides, spinels, and related frameworks) have been the cornerstone of rechargeable Li batteries, enabling reversible Li insertion with high energy density and structural retention across oxides such as LiCoO2, Mn oxides, and vanadium oxides, as demonstrated in multiple early studies [2], [4], [14], [13], [18].

• Solid electrolytes and electrode–electrolyte interfaces emerged as critical determinants of practical nonaqueous cells, highlighting surface layer formation (solid electrolyte interphase) and ion conduction in ceramic electrolytes as key enablers [5], [6], [20].

• Rocking-chair battery concepts matured with carbon-based anodes and oxide cathodes, promoting safer, rechargeable architectures and enabling environmentally robust cycling in systems such as LiNiO2/Carbon and LiMn2O4/Carbon varieties [1], [13], [17].

• Kinetic and structural characterization methods (diffusion, phase transformations, and topochemical reactions) advanced understanding of intercalation processes, using techniques like mixed-conductor electrode analysis and X-ray diffraction in MnO2 systems as exemplars [12], [14], [11].

• Broad intercalation chemistry, including foundational reviews and early demonstrations of layered and titanate-like hosts, framed a research agenda for energy storage and guided subsequent development of high-energy-density cathodes and intercalation chemistries [3], [5], [2].