期刊
CHEMISTRY OF MATERIALS
卷 25, 期 17, 页码 3480-3487出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm401657c
关键词
sodium-ion battery; cathode; Na2FeP2O7; NaFeP2O7; polymorphism; safety
资金
- Mitsubishi Motors Corporation
- Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) under the Element Strategy Initiative for Catalysts & Batteries (ESICB) project
- Japan Society for the Promotion of Sciences for a JSPS Fellowship at the University of Tokyo
- Australian Research Council-Discovery Projects
Vying for newer sodium-ion chemistry for rechargeable batteries, Na2FeP2O7 pyrophosphate has been recently unveiled as a 3 V high-rate cathode. In addition to its low cost and promising electrochemical performance, here we demonstrate Na2FeP2O7 as a safe cathode with high thermal stability. Chemical/electrochemical desodiation of this insertion compound has led to the discovery of a new polymorph of NaFeP2O7. High-temperature analyses of the desodiated state NaFeP2O7 show an irreversible phase transition from triclinic (P (1) over bar) to the ground state monoclinic (P2(1)/c) polymorph above 560 degrees C. It demonstrates high thermal stability, with no thermal decomposition and/or oxygen evolution until 600 degrees C, the upper limit of the present investigation. This high operational stability is rooted in the stable pyrophosphate (P2O7)(4-) anion, which offers better safety than other phosphate-based cathodes. It establishes Na2FeP2O7 as a safe cathode candidate for large-scale economic sodium-ion battery applications.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据