Na2MnSiO4 as a positive electrode material for sodium secondary batteries using an ionic liquid electrolyte

Abstract

Sodium manganese orthosilicate, Na 2 MnSiO 4 , 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. Na 2 MnSiO 4 became amorphous upon the electrochemical removal of sodium, exhibiting a similar behavior as its lithium equivalent. Both Na 2 MnSiO 4 and its desodiated form (Na 0.8 MnSiO 4) possess remarkable thermal stability, suggesting their safety characteristic.

Na2CoSiO4 as a novel positive electrode material for sodium-ion capacitors

“…[17]. Recently, Na 2 MnSiO 4 has been proposed as promising Na storage materials owing to low cost, environmental benignity, and excellent safety characteristics [18].…”

Improved Electrochemical Performance of NaVOPO4Positive Electrodes at Elevated Temperature in an Ionic Liquid Electrolyte

“…[36][37][38] The wide liquidus range of the Na[FSA]-[C 3 C 1 pyrr][FSA] IL (C 3 C 1 pyrr = N-methyl-Npropylpyrrolidinium) allowed us to investigate the charge-discharge behavior of targeted electrode materials from low (253 K) to elevated temperatures (363 K). [39][40][41] The results revealed a considerable enhancement in reversible capacity and rate capability with increasing temperature The performance of batteries with conventional organic electrolyte solvents have been rarely investigated at temperatures greater than 328 K, above which poor storage and inferior cycling behaviors are generally observed. 42,43 Since a concrete improvement in electrochemical properties was observed in IL electrolytes at elevated temperatures, operation at above room temperature is preferable and also practicable for electric vehicle and stationary storage applications.…”

Effect of the electrolytic solvent and temperature on aluminium current collector stability: A case of sodium-ion battery cathode

“…Among them, NaFSI in N-propyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide (named NaFSIeC 3 C 1 pyrrFSI hereafter) has been tested with different electrode materials such as NaCrO 2 [31,32], Na 2 FeP 2 O 7 [33], Na 2 MnSiO 4 [34] and hard carbon [35] and its physical properties such as viscosity and ionic conductivity have been reported as a function of temperature and NaFSI salt concentration [31]. However, to the best of our knowledge, specific studies devoted to anodic stability of Na-ion battery electrolytes in the presence of Al are not reported yet.…”