Carbon-Coated CuNb 13 O 33 as A New Anode Material for Lithium Storage

Niobates are very promising anode materials for Li -storage rooted in their good safety and high capacities. However, the exploration of niobate anode materials is still insufficient. In this work, we explore ~1 wt% carbon-coated CuNb O microparticles (C-CuNb O ) with a stable shear ReO structure as...

Full description

Saved in:
Bibliographic Details
Published inMaterials Vol. 16; no. 5
Main Authors Gao, Jiazhe, Li, Songjie, Wang, Wenze, Ou, Yinjun, Gao, Shangfu, Liu, Xuehua, Lin, Chunfu
Format Journal Article
LanguageEnglish
Published Switzerland 22.02.2023
Subjects
Online AccessGet full text

Cover

Loading…
More Information
Summary:Niobates are very promising anode materials for Li -storage rooted in their good safety and high capacities. However, the exploration of niobate anode materials is still insufficient. In this work, we explore ~1 wt% carbon-coated CuNb O microparticles (C-CuNb O ) with a stable shear ReO structure as a new anode material to store Li . C-CuNb O delivers a safe operation potential (~1.54 V), high reversible capacity of 244 mAh g , and high initial-cycle Coulombic efficiency of 90.4% at 0.1C. Its fast Li transport is systematically confirmed through galvanostatic intermittent titration technique and cyclic voltammetry, which reveal an ultra-high average Li diffusion coefficient (~5 × 10 cm s ), significantly contributing to its excellent rate capability with capacity retention of 69.4%/59.9% at 10C/20C relative to 0.5C. An in-situ XRD test is performed to analyze crystal-structural evolutions of C-CuNb O during lithiation/delithiation, demonstrating its intercalation-type Li -storage mechanism with small unit-cell-volume variations, which results in its capacity retention of 86.2%/92.3% at 10C/20C after 3000 cycles. These comprehensively good electrochemical properties indicate that C-CuNb O is a practical anode material for high-performance energy-storage applications.
ISSN:1996-1944
1996-1944