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Chen, Chih-Yao; Matsumoto, Kazuhiko; Nohira, Toshiyuki; Hagiwara, Rika
Electrochemistry communications, 08/2014, Letnik: 45Journal Article
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 NaFSA–C3C1pyrrFSA (FSA=bis(fluorosulfonyl)amide anion and C3C1pyrr=N-methyl-N-propylpyrrolidinium cation) ionic liquid electrolyte in the temperature range 298–363K. Carbon coating and elevation of operational temperatures significantly improved the electrode performance. A reversible capacity of 125mAhg−1 (90% of the theoretical value based on a one-electron transfer process) was found at a rate of C/10 (13.9mAg−1) within 2.0–4.0V at 363K, 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. Display omitted
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