TY - JOUR
T1 - Na2Fe(SO4)2: an anhydrous 3.6 V, low cost and good safety cathode for rechargeable sodium-ion battery
AU - Pan, Wenli
AU - Guan, Wenhao
AU - Liu, Shuangyu
AU - Xu, Ben Bin
AU - Liang, Chu
AU - Pan, Hongge
AU - Yan, Mi
AU - Jiang, Yingzhu
N1 - Funding Information:
aState Key Laboratory of Silicon Materials, Key Laboratory of Novel Materials for Information Technology of Zhejiang Province, School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, P. R. China. E-mail: [email protected] bState Key Laboratory of Advanced Transmission Technology, Global Energy Interconnection Research Institute Co. Ltd, Beijing 102211, China cSmart Materials and Surfaces Lab, Mechanical Engineering, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne NE1 8ST, UK dCollege of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, PR China
Funding Information:
This work is supported by the National Natural Science Foundation of China (Grant No. 51722105), National Key Research and Development Program (Grant No. 2016YFB0901600), Zhe-jiang Provincial Natural Science Foundation of China (LR18B030001), and the Fundamental Research Funds for the Central Universities (2018XZZX002-08).
Publisher Copyright:
© 2019 The Royal Society of Chemistry.
PY - 2019/6/7
Y1 - 2019/6/7
N2 - Iron-based sulfate cathode materials are promising for rechargeable batteries due to their elevated operating voltages and earth-abundant elemental composition. However, the inherent unstable SO42- units in those sulfate materials result in their low-temperature decomposition (<450 °C) and lead to SO2 gas evolution, which would hinder sulfate electrodes from outputting high voltage in safety. Herein, a new alluaudite-type sulfate cathode Na2Fe(SO4)2 for sodium ion battery is reported, which displays a high operating voltage at ~3.6 V based on Fe2+/Fe3+ redox couple as well as superior thermal stability (~580 °C). In both air and inert ambient, its SO42-units demonstrates high thermal stability, assuring good safety for battery application. Furthermore, the Na2Fe(SO4)2 cathode material shows superior stability toward moisture for ease handling. The cathode exhibits a reversible capacity of 82 mAh g-1 at 0.1 C under nonoptimal carbon coating and maintains over 60% capacity retention at 2 C. The excellent sodium storage ability tested at 0 °C and 55 °C further demonstrates the advantages of Na2Fe(SO4)2 for future energy storage applications in a wide temperature range. The present exploration on Na2Fe(SO4)2 for sodium ion battery can pave the way for developing low cost sulfate cathodes combining high voltage and good safety.
AB - Iron-based sulfate cathode materials are promising for rechargeable batteries due to their elevated operating voltages and earth-abundant elemental composition. However, the inherent unstable SO42- units in those sulfate materials result in their low-temperature decomposition (<450 °C) and lead to SO2 gas evolution, which would hinder sulfate electrodes from outputting high voltage in safety. Herein, a new alluaudite-type sulfate cathode Na2Fe(SO4)2 for sodium ion battery is reported, which displays a high operating voltage at ~3.6 V based on Fe2+/Fe3+ redox couple as well as superior thermal stability (~580 °C). In both air and inert ambient, its SO42-units demonstrates high thermal stability, assuring good safety for battery application. Furthermore, the Na2Fe(SO4)2 cathode material shows superior stability toward moisture for ease handling. The cathode exhibits a reversible capacity of 82 mAh g-1 at 0.1 C under nonoptimal carbon coating and maintains over 60% capacity retention at 2 C. The excellent sodium storage ability tested at 0 °C and 55 °C further demonstrates the advantages of Na2Fe(SO4)2 for future energy storage applications in a wide temperature range. The present exploration on Na2Fe(SO4)2 for sodium ion battery can pave the way for developing low cost sulfate cathodes combining high voltage and good safety.
UR - http://www.scopus.com/inward/record.url?scp=85066844670&partnerID=8YFLogxK
U2 - 10.1039/C9TA02188D
DO - 10.1039/C9TA02188D
M3 - Article
SN - 2050-7488
VL - 7
SP - 13197
EP - 13204
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 21
ER -