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Extracting lithium resources from seawater and brine can promote the development of the new energy materials industry. The electrochemical method is green and efficient. Iron phosphate (FePO4) crystal, with its 1D ion channel, holds significant potential as a primary lithium extraction electrode material. Li+ encounters a substantial concentration disadvantage in brines, and the co‐intercalation of Na+ diminishes Li+ selectivity. To address this issue, this work enhances the energy barrier for Na+ insertion through prelithiation strategies applied to the 1D channels of FePO4 crystal, thereby improving Li+ selectivity, and further investigating the prelithiation effect with particle size and morphology control. The results indicate that the Li(4C‐40%)FePO4// Activated carbon(AC) system enhances selectivity of lithium. The Li(4C‐40%)FePO4 with size diameter of 2500 nm demonstrates an energy consumption of 0.79 Wh mol−1 and a purity of 97.94% for lithium extraction at a unit lithium extraction of 5.93 mmol g−1 in simulated brine. Li(4C‐40%)FePO4‐nanoplates demonstrate the most optimal lithium extraction performance among the three morphologies due to their lamellar structure's short ion diffusion path in the [010] channel, favoring Li+ diffusion. The diffusion energy barriers of Li+ and Na+ are calculated using Density Functional Theory (DFT) before and after prelithiation, showing good agreement with experimental results. [ABSTRACT FROM AUTHOR]

Tellurium (Te) has attracted intensive attention for its potential as stationary energy storage system due to its high volumetric capacity and the intrinsic electronic conductivity. Nevertheless, this battery suffers from the low utilization of active Te and the vast volume variations during cycling. Hierarchical N‐doped carbon (N−C) porous microspheres etched from MnCO3 microsphere template are designed as a host for Te. The hierarchical microspheres, with abundant pores and voids, shortens the ions diffusion/electrons transport distances and buffers the volume expansion of the active materials. When constructed the K−Te battery, the Te@N−C electrode delivers a remarkable reversible capacity of 390 mA h g−1 (corresponding to 2437.5 mA h cm−3) at 0.1 A g−1 after 100 cycles and 170 mA h g−1 (corresponding to 1062.5 mA h cm−3) after 2000 cycles at 0.5 A g−1. This novel design in this work may open up new opportunities for the development of the new energy storage systems with high volumetric energy density. [ABSTRACT FROM AUTHOR]