They are now on the verge of transforming the transportation sector with electric cars, buses, and bikes. Lithium-ion batteries have become an integral part of our daily life, powering the cellphones and laptops that have revolutionized the modern society 1, 2, 3. This review article provides a reflection on how fundamental studies have facilitated the discovery, optimization, and rational design of three major categories of oxide cathodes for lithium-ion batteries, and a personal perspective on the future of this important area. With the award of the 2019 Nobel Prize in Chemistry to the development of lithium-ion batteries, it is enlightening to look back at the evolution of the cathode chemistry that made the modern lithium-ion technology feasible. Basic science research, involving solid-state chemistry and physics, has been at the center of this endeavor, particularly during the 1970s and 1980s. The emergence and dominance of lithium-ion batteries are due to their higher energy density compared to other rechargeable battery systems, enabled by the design and development of high-energy density electrode materials. They are now enabling vehicle electrification and beginning to enter the utility industry. Lithium-ion batteries have aided the portable electronics revolution for nearly three decades.
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