Lithium-ion batteries (LIBs) have dominated portable electronics industry and solid-state electrochemical R&D for the past two decades. In light of possible concerns over the cost and future availability of lithium, sodium-ion batteries (SIBs) and other new technologies have emerged as candidates for large-scale stationary energy storage. Research in these technologies has increased dramatically with a focus on the development of new materials for both the positive and negative electrodes that can enhance the cycling stability, rate capability, and energy density. Two-dimensional (2D) nanomaterials are showing promise for many energy-related applications and particularly for energy storage, because of the efficient ion transport between the layers and the large surface areas available for improved ion adsorption and faster surface redox reactions.
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