Stacked Cu2-xSe nanoplates with 2D nanochannels as high performance anode for lithium batteries

Transition metal chalcogenides are considered as promising alternative materials for lithium-ion batteries owing to their relatively high theoretical capacity. However, poor cycle stability combined with low rate capacity still hinders their practical applications. In this work, the Cu-N chemical bonding directed the stacking Cu2-xSe nanoplates (DETA-Cu2-xSe) is developed to solve this issue. Such unique structure with small nanochannels can enhance the reactive site, facilitate the Li-ion transport as well as inhibit the structural collapse. Benefitting of these advantages, the DETA-Cu2-xSe exhibits high specific capacity, better rate capacity and long cyclability with the specific capacities of 565 mAh g(-1) after 100 cycles at 200 mA g(-1) and 368 mAh g(-1) after 500 cycles at 5000 mA g(-1). This novel DETA-Cu(2-x)Se( )structure with nanochannels is promising for next generation energy storage and the synthetic process can be extended to fabricate other transition metal chalcogenides with similar structure. (C) 2021 Elsevier Inc. All rights reserved.

Automated summary

Transition metal chalcogenides are considered as promising alternative materials for lithium-ion batteries due to their high theoretical capacity. In this work, a novel Cu-N chemical bonding directed structure, DETA-Cu2-xSe, with nanochannels is developed to improve the reactive site and inhibit structural collapse, leading to high specific capacity and long cyclability. The synthetic process can be extended to fabricate other transition metal chalcogenides with similar structure, showing great potential for next generation energy storage.