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...
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Published in | Materials Vol. 16; no. 5 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Switzerland
22.02.2023
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Subjects | |
Online Access | Get full text |
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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. |
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ISSN: | 1996-1944 1996-1944 |