Defect engineering of hierarchical porous carbon microspheres for potassium-ion storage

Elastic MXene conductive layers and electrolyte engineering enable robust potassium storage

“…The relatively large ionic radius of potassium hinders diffusion kinetics within the crystals, consequently emphasizing the effectiveness of surface-controlled capacitive storage in achieving superior electrochemical performance, particularly at high current densities. 31 …”

Co‐Solvent Electrolyte Design to Inhibit Phase Transition toward High Performance K+/Zn2+ Hybrid Battery

“…[19][20][21] Taking K + as an example, K + has a larger crustal abundance than Li + , and the hydrated ion radius of K + is 3.31 Å, much smaller than that of Li + (3.82 Å). [3,22] Therefore, aqueous electrolyte systems using K + as carriers often have better ion conductivity, which makes K + -based aqueous hybrid batteries often have better rate performance. Therefore, KOTf and Zn(OTf) 2 hybrid electrolyte can be selected with the aim to realize high-performance aqueous-based battery.…”

Loss-free pulverization by confining copper oxide inside hierarchical nitrogen-doped carbon nanocages toward superb potassium-ion batteries

“…10,12 To date, various PIB anode materials have been explored, including intercalation-, conversion-, alloy-, organic-, and mixed-type materials. 13,14 Thereinto, the conversion-type anode materials, mainly the metal oxides and transition metal dichalcogenides, experience the complete reduction of the metal compounds to the metallic state during the K + storage, which ensures a high theoretical capacity with great potential applications. 4,13 As we know, conversion-type CuO has many advantages such as the high theoretical specific capacity (674 mA h g À1 ), environmental benignity, abundant resources, high chemical stability, facile synthesis, and economic applicability, and hence has been widely studied in LIBs and SIBs.…”