A Calcium‐Ion Hybrid Energy Storage Device with High Capacity and Long Cycling Life under Room Temperature

• Published in: Advanced energy materials 2019-04, Vol.9 (16), p.n/a
• Main Authors: Wu, Nanzhong, Yao, Wenjiao, Song, Xiaohe, Zhang, Ge, Chen, Bingjie, Yang, Jinhu, Tang, Yongbing
• Format: Article
• Language: English
• Subjects: Batteries; battery‐capacitor hybrid devices; Calcium ions; calcium‐ion; Electrode materials; Electrolytes; Energy storage; Lithium; long cycling life; Reaction kinetics; Room temperature
• ISSN: 1614-6832; 1614-6840
• DOI: 10.1002/aenm.201803865

Ca‐ion based devices are promising candidates for next‐generation energy storage with high performance and low cost, thanks to its multielectrons, superior kinetics, as well as abundance (2500 times lithium). Because of the lack of an appropriate combination of suitable electrode materials and electrolytes, it is unsuccessful to attain a satisfactory performance on complete Ca‐ion energy storage devices. Here, the multiion reaction strategy is defined to construct a complete Ca‐ion energy storage device and a capacitor–battery hybrid mechanism is deliberately adopted. Profiting from the elaborate design, it exhibits a high reversible capacity of 92 mAh g−1, unmatchable rate capability, and a high capacity retention of 84% over 1000 cycles under room temperature, which is the best performance of reported Ca‐based energy storage devices. A Ca‐ion hybrid energy storage device (Ca‐HSC) with capacitor component cathode and battery component anode is developed in this work. The Ca‐HSC achieves a reversible capacity of 92 mAh g−1 and excellent cycling stability with capacity retention of 84% after 1000 cycles at a high current rate of 0.1A g−1, suggesting its potential application for high‐performance room‐temperature energy storage devices.