Dynamic Structural Evolution News Today : Breaking News, Live Updates & Top Stories | Vimarsana

Manganese-based layered oxides show promise as cathode materials for sodium-ion batteries (SIBs). However, several challenges including sluggish Na+ kinetics, complex phase transitions, and poor air stability hinder their practical application. Herein, we proposed a dual-function strategy that not only precisely manipulates dynamic structural evolution from layered to tunnel structure, but also effectively suppresses Na+/vacancy and charge ordering by inhibiting electron delocalization. A series of Ti-substituted Na2/3Mn1-xTixO2 (x=0, 1/9, 2/9, 1/3) as proof of concept materials were designed ...

The pursuit of high energy density while achieving long cycle life remains a challenge in developing transition metal (TM) oxide cathode materials for sodium-ion batteries (SIBs). Here, we present a concept of precisely manipulating structural evolution via local coordination chemistry regulation to design high-performance composite cathode materials. The controllable structural evolution process is realized by tuning magnesium content in Na0.6Mn1−xMgxO2, which is elucidated by a combination of experimental analysis and theoretical calculations. The substitution of Mg into Mn sites not only ...

Developing high-voltage cathode materials for sodium-ion batteries (SIBs) is both challenging and extremely urgent. Here, we report an abnormal high-voltage Na2/3Ni1/3Sn2/3O2 cathode material with a P2-structure stoichiometric composition and an O3-type layered phase. Using a classic P2-type layered oxide cathode Na2/3Ni1/3Mn2/3O2 as a model system, we demonstrate the accurate manipulation of orbital hybridization between transition metal and oxygen atoms to regulate the redox potential through engineering the chemical composition and corresponding electronic structure. Meanwhile, an in-depth ...