“Zero-Strain” NiNb2O6 Fibers for All-Climate Lithium Storage

Abstract

Highlights “Zero-strain” NiNb2O6 fibers with nanosized primary particles are explored as an all-climate anode material with comprehensively good Li+-storage properties. The almost completely opposite volume changes of electrochemical inactive NiO6 octahedra and active NbO6 octahedra are achieved through reversible O movement, leading to the “zero-strain” behavior of NiNb2O6 with minor unit-cell-volume change and excellent cyclability in a broad temperature range. The gained insight can provide guide for the exploration of high-performance energy-storage materials working at harsh temperatures.

Keywords

• NiNb2O6 porous fiber
• “Zero-strain” mechanism
• Electrochemical property
• Harsh-temperature operation
• Operando characterization