Pampas grass-inspired FeOOH nanobelts as high performance anodes for sodium ion batteries

High-performance materials are the key to developing new alternative energy-storage systems[1-4].Sodium ion batteries(SIBs)are regarded as the promising large-scale electric energy storage owing to the high abundance and low cost of sodium resources[1,5-9].However,the sluggish kinetics of Na^(+)caused by the large-sized Na^(+)(1.02A)result in the lower energy density and unsatisfactory electrochemical properties[10-14].

Progress in niobium-based oxides as anode for fast-charging Li-ion batteries

With the increasing popularity of electric/hybrid vehicles and the rapid development of 3C electronics,there is a growing interest in high-rate energy storage systems.The rapid development and widespread adoption of lithiumion batteries(LIBs)can be attributed to their numerous advantages,including high energy density,high operating voltage,environmental friendliness,and lack of memory effect.However,the progress of LIBs is currently hindered by the limitations of energy storage materials,which serve as vital components.Therefore,there is an urgent need to address the development of a new generation of high-rate energy storage materials in order to overcome these limitations and further advance LIB technology.Niobium-based oxides have emerged as promising candidates for the fabrication of fast-charging Li-ion batteries due to their excellent rate capability and long lifespan.This review paper provides a comprehensive analysis of the fundamentals,methodologies,and electrochemistries of niobium-based oxides,with a specific focus on the evolution and creation of crystal phases of Nb_(2)O_(5),fundamental electrochemical behavior,and modification methods including morphology modulation,composite technology,and carbon coating.Furthermore,the review explores Nb_(2)O_(5)-derived compounds and related advanced characterization techniques.Finally,the challenges and issues in the development of niobiumbased oxides for high-rate energy storage batteries are discussed,along with future research perspectives.

Rechargeable Na-CO_(2) Batteries Starting from Cathode of Na2CO_(3) and Carbon Nanotubes

Na-CO_(2) batteries have attracted signifcant attentions due to their high energy density and efective utilization of greenhouse gas CO_(2).However,all reported Na-CO_(2) batteries employ excessive preloaded metal Na,which will lead to safety issues such as dendrite formation and short circuit.In addition,the charging mechanism of reported Na-CO_(2) batteries is not very clear.Here we report the Na-CO_(2) batteries,starting from the cathode of cheap Na2CO_(3) and multiwalled carbon nanotubes(CNTs).Due to the efective electron transfer and high reactivity,the decomposition of Na2CO_(3) and CNTs could take place under 3.8 V.Te charging mechanism of 2Na2CO_(3)+C�→4Na+3CO_(2) without any side reactions is revealed by in/ex situ techniques such as Raman,gas chromatograph,and optical microscope.Dendrite-free Na can quantitatively deposit on the Super P/Al anode because of large specifc surface area and low nucleation barrier of the anode for Na plating.Te batteries could deliver an energy density of 183 Wh kg−1(based on the whole mass of the pouch-type batteries,4 g)with stable cycling performance.Tis work reveals that safe rechargeable Na-CO_(2) batteries could be constructed by cheap Na2CO_(3) and multiwalled carbon nanotubes.