Recent progress on FeS_(2) as anodes for metal-ion batteries

The ever-growing demand for advanced battery technologies with high energy and power density,high security,prolonged cycle life,and sustainably low cost requires the development of novel electrode materials for lithium-ion batteries(LIBs),as well as the alternative electrochemical energy storage technologies of sodium-ion batteries(SIBs)and potassium-ion batteries(PIBs)for their abundant alkali metal elements resources.Among various anode materials,such as graphite,organic compounds,metal oxides,and chalcogenides,iron sulfides have attracted substantial interests for their high theoretical capacity and low price.Specifically,as a common mineral that has been already applied as electrode for primary battery,ferrous disulfide(FeS_(2))has been regarded as one of the promising candidate anode materials and studied widely.Unfortunately,there are some inherent problems handicapping its practical application for alkali-ion batteries,including limited ionic/electrical conductivity,the formation of soluble polysulfides,and large volume change.In the last decade,massive efforts have been devoted to solving those problems.In this review,the various synthesis strategies,the effect of morphologies and particle sizes,the energy storage mechanisms,and the electrochemical performances of FeS_(2) as anode for alkaliion batteries(LIBs,SIBs,and PIBs)are summarized.Furthermore,the existing challenges and prospects of the development of FeS_(2)-based anode materials for alkali-ion batteries are presented at last.

Recent advances in alloy-based anode materials for potassium ion batteries

Potassium ion batteries(PIBs)are regarded as one of promising low-cost energy storage technologies.Achieving long cycle life and high energy density has been considered as important tasks for developing high-performance PIBs.The alloy-based anodes for PIBs have attracted great attentions because of their high theoretical capacity and relatively low operating voltage.In this review,the latest advance in the related alloy-based anodes was overviewed.Specifically,the correlations among the morphology and potassium storage performance,phase transition mechanisms,the formation of solid electrolyte interphases and ionic transport kinetics are critically discussed.It is expected that this review will provide meaningful guidance and possible pathways for the developments of alloy-based anodes for PIBs.