期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 45, 期 -, 页码 63-66出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2014.05.017
关键词
Sodium secondary battery; Na2MnSiO4; Positive electrode; Ionic liquid; Bis(fluorosulfonyl)amide
资金
- Advanced Low Carbon Technology Research and Development Program (ALCA) of the Japan Science and Technology Agency (JST) [3428]
- Elements Strategy Initiative to Form Core Research Center program of the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT)
Sodium manganese orthosilicate, Na2MnSiO4, was synthesized by a sol-gel method and investigated for use as a positive electrode material for Na secondary batteries using Na[FSA]-[C(3)C(1)pyrr][FSA] (FSA = bis(fluorosulfonyl) amide anion and C(3)C(1)pyrr = N-methyl-N-propylpyrrolidinium cation) ionic liquid electrolyte in the temperature range 298-363 K. Carbon coating and elevation of operational temperatures significantly improved the electrode performance. A reversible capacity of 125 mAh g(-1) (90% of the theoretical value based on a one-electron transfer process) was found at a rate of C/10 (13.9 mA g(-1)) within 2.0-4.0 V at 363 K, with an acceptably high rate capability. Na2MnSiO4 became amorphous upon the electrochemical removal of sodium, exhibiting a similar behavior as its lithium equivalent. Both Na2MnSiO4 and its desodiated form (Na0.8MnSiO4) possess remarkable thermal stability, suggesting their safety characteristic. (C) 2014 Elsevier B.V. All rights reserved.
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