阳极
空位缺陷
阴极
钙钛矿(结构)
化学计量学
锂(药物)
离子
氧化还原
容量损失
材料科学
储能
电极
无机化学
化学
化学工程
物理化学
热力学
结晶学
内分泌学
工程类
物理
功率(物理)
有机化学
医学
作者
Xiaolei Li,Zifeng Lin,Na Jin,Xiaojiao Yang,Lei Sun,Yuan Wang,Lei Xie,Xiping Chen,Lei Li,Patrick Rozier,Patrice Simon,Ying Li
标识
DOI:10.1016/j.scib.2022.11.006
摘要
Perovskite SrVO3 has been investigated as a promising lithium storage anode where the V cation plays the role of the redox center, combining excellent cycle stability and safe operating potential versus Li metal plating, with limited capacity. Here, we demonstrate the possibility to boost the lithium storage properties, by reducing the non-redox active Sr cation content and fine-tuning the O anion vacancies while maintaining a non-stoichiometric SrxVO3-δ perovskite structure. Theoretical investigations suggest that Sr vacancy can work as favorable Li+ storage sites and preferential transport channels for guest Li+ ions, contributing to the increased specific capacity and rate performance. In contrast, inducing O anion vacancy in SrxVO3-δ can improve rate performance while compromising the specific capacity. Our experimental results confirm the enhancement of specific capacities by fine adjusting the Sr and O vacancies, with a maximum capacity of 444 mAh g-1 achieved with Sr0.63VO3-δ, which is a 37% increase versus stoichiometric SrVO3. Although rich defects have been induced, SrxVO3-δ electrodes maintain a stable perovskite structure during cycling versus a LiFePO4 cathode, and the full-cell could achieve more than 6000 discharge/charge cycles with 80% capacity retention. This result highlights the possibility to use the cation defective-based engineering approach to design high-capacity perovskite oxide anode materials.
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