Synthesis of CoSe₂ reinforced nitrogen-doped carbon composites as advanced anodes for potassium-ion batteries

Abstract

Potassium-ion batteries (PIBs) are considered as potential candidates for large-scale energy storage applications with the cost superiority. However, the development of PIBs is severely retarded by the sluggish electrochemical kinetics...

Metal Selenides Find Plenty of Space in Architecting Advanced Sodium/Potassium Ion Batteries

“…As for PIBs, the electrochemical reactions of CoSe 2 with K + follow the combination of intercalation and conversion, which can be expressed as Equation (25). [119] To further push the implementation of CoSe 2 for PIBs, abundant efforts have been made. Anion-regulated strategy has been employed for electrode materials due to its anticipative improvement of comprehensive electrochemical performance.…”

A comprehensive review of carbon anode materials for potassium-ion batteries based on specific optimization strategies

“…According to the pore size distribution, it is illustrated that the micropores (d p < 2 nm) can provide abundant sites for K-ion uptake, while the mesopores (2 nm < d p < 50 nm) can shorten the ion diffusion distance for fast reaction kinetics. 16,29,97,98 As for macropores (d p > 50 nm), these can function as a buffering space and electrolyte reservoir, 21,99,100 considerably resulting in an improved structure stability and capacity. Accordingly, rationally tailoring hierarchical-porous structure in carbon anode is highly attractive for realizing an excellent potassium-storage performance.…”

“…13 Besides that, the redox potential of K + /K (−2.93 V vs. a standard hydrogen electrode) is very close to that of LIBs (−3.04 V), meaning a higher output voltage and thus a better energy density for full cells in theory. [14][15][16][17] Inspired by these striking characteristics, the design and development of anode materials have made significant progress.…”

Bimetallic-based composites for potassium-ion storage: challenges and perspectives

“…Bimetallic selenides exhibited better electrical conductivity and higher redox activity compared to monometallic selenides by introducing a second metal element and exploiting synergistic and multi-electron reactions between the two metal ions. 155,156 More specifically, metals with various valence states were able to generate different redox potentials for different Faraday redox reactions, contributing to the giving and receiving of electrons during charging and discharging. In addition, bimetallic selenides have a large insertion gap and weak metallic selenium bonds (A-Se), which can improve the reactivity and avoid the formation of dendrites in the low voltage range to ensure the safety of the battery.…”