Preparation, Characterization, and Lithium Intercalation Behavior of LiVO3 Cathode Material for Lithium-Ion Batteries

详细信息    查看全文

• 作者：Zheng Huang ; Liufei Cao ; Liang Chen ; Yafei Kuang ; Haihui Zhou ; Chaopeng Fu ; Zhongxue Chen
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：February 18, 2016
• 年：2016
• 卷：120
• 期：6
• 页码：3242-3249
• 全文大小：651K
• ISSN：1932-7455

文摘

A variety of LiVO₃ compounds (LVO-350, LVO-400, LVO-450, and LVO-500) have been synthesized via a resorcinol-formalin assisted sol–gel method. The LiVO₃ cathodes calcined at different temperatures are characterized by XRD, SEM, and galvanostatic charge/discharge to investigate the effects of annealing on the structure, morphology, and electrochemical characteristics. The results show that both crystallinity and morphology play important roles in the Li-storage properties of LiVO₃; the sample annealed at 450 °C (LVO-450) has high crystallinity, moderated particle size, and thus exhibits the best electrochemical performance among the four electrodes. Furthermore, the Li-ion intercalation/deintercalation mechanism for LiVO₃ is investigated by ex situ XRD, TEM, Raman spectroscopy, and XPS. The characterizations on the pristine and cycled LVO-450 reveal that the initial lithium insertion/extraction reaction of LiVO₃ based on V⁵⁺/V⁴⁺ redox couple undergoes a successive structural transition: monoclinic LiVO₃ transforms into cubic Li₂VO₃ upon lithium intercalation, followed by the lithiated Li₂VO₃ transforms into a more stable phase which has a similar crystalline structure to monoclinic LiV₃O₈ upon initial lithium deintercalation. Importantly, the observations in this work may provide valuable information for the design of LiVO₃ and other high-capacity vanadium-based cathode materials for lithium-ion batteries.