Spinel LiNi0.5Mn1.5O4 (LNMO) is one potential cathode candidate for the next-generation high energy-density lithium-ion batteries (LIBs). However, the serious capacity decay from its poor structural stability, especially at high operating...

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The upsurge of potassium-ion energy storage devices promotes the fast development of K-ion storage electrode materials, but the poor kinetics and low capacity resulted from the large size of K-ions...

Inspired by natural biomineralization, a biomineralized microreactor with a mesocrystal KCl shell (BM‐KCl‐MMs) is made by a facile freezing dry process, exhibiting a good availability for high‐temperature solid‐state synthesis of nanomaterials. Benefiting from the good thermal stability, stiffness, and mechanical strength of KCl mesocrystal shells, the employment of BM‐KCl‐MMs in the transition metal (TM)–S–Se system not only realizes for the first time, the production of TMSxSe2−x/C nanocomposites in air atmosphere, but also reaches a high reagent‐utilization and high yield, as well as minimum wastes. More importantly, based on the soaking effect of the KCl shells, the resultant stable reaction microenvironment inside endows the microreactors with a well‐controlled synthesis of nanomaterials with very even size, uniform dispersion, and novel functionalities. As one example, the as‐prepared MoSxSe2−x/C composites as the electrodes of K‐ion batteries and K‐ion hybrid supercapacitors deliver the state of the art cycling capability of 248 mAh g−1 at 2 A g−1 after 5000 cycles and an 87.1% capacity retention at 5.0 A g−1 after 20 000 cycles, respectively, demonstrating a significant potential of BM‐KCl‐MMs on design and synthesis of novel functional nanomaterials.

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