Rapid Amorphization in Metastable CoSeO3·H2O Nanosheets for Ultrafast Lithiation Kinetics.
The realization of high-performance anode materials with high capacity at fast lithiation kinetics and excellent cycle stability remains a significant but critical challenge for high-power applications such as electric vehicles. Two-dimensional nanostructures have attracted considerable research interest in electrochemical energy storage devices owing to their intriguing surface effect and significantly decreased ion-diffusion pathway. Here we describe rationally designed metastable CoSeO3·H2O nanosheets synthesized by a facile hydrothermal method for use as a Li ion battery anode. This crystalline nanosheet can be steadily converted into amorphous phase at the beginning of the first Li+ discharge cycling, leading to ultrahigh reversible capacities of 1100 and 515 mAh g-1 after 1000 cycles at a high rate of 3 and 10 A g-1, respectively. The as-obtained amorphous structure experiences an isotropic stress, which can significantly reduce the risk of fracture during electrochemical cycling. Our study offers a precious opportunity to reveal the ultrafast lithiation kinetics associated with the rapid amorphization mechanism in layered cobalt selenide nanosheets.
['Jiang|Yingchang|Y|', 'Song|Yun|Y|0000-0002-7387-7132', 'Pan|Zhichang|Z|', 'Meng|Yu|Y|', 'Jiang|Le|L|', 'Wu|Zeyi|Z|', 'Yang|Peiyu|P|', 'Gu|Qinfen|Q|', 'Sun|Dalin|D|', 'Hu|Linfeng|L|0000-0002-0640-508X']
rapid amorphization metastable CoSeO3·H2O nanosheets ultrafast lithiation kinetics lithium storage