Optimization of NixCo1-x-yMnySe2 composition for efficient sodium storage
Publication Name
Chemical Engineering Journal
Abstract
Due to the low cost and the abundance of Na resources, sodium-ion batteries (SIBs) have emerged as leading candidates for next-generation energy storage devices. For Se-based anodes, large volume expansion during cycling leads to poor structural reversibility and fast capacity fade. To overcome it, the heterostructured Ni1/3-xCo1/3-yMn1/3-zSe2/MnSe2 is constructed via tuning metal ratio with good controllability, in which the functionalities of heterostructure in realizing high-performance SIBs is comprehensively studied. Benefiting from the synergistic effect of element ratio optimization and heterostructure construction, Ni1/3-xCo1/3-yMn1/3-zSe2/MnSe2 simultaneously realizes high capacity, fast Na+ storage performance, and long-cycling durability. Remarkably, it exhibits a specific capacity of around 400 mAh g−1 at 2 A g−1, and achieves a capacity retention as high as ∼ 99.9 % after 2000 cycles, outperforming most Se-based anodes. Therefore, this work not only demonstrates the significance of heterostructure engineering in a cubic NixCo1-x-yMnySe2 anode, but also opens a new avenue for achieving high-performance electrode materials based on heterostructure construction.
Open Access Status
This publication is not available as open access
Volume
456
Article Number
140951
Funding Number
U20A200201
Funding Sponsor
National Natural Science Foundation of China