Surface modified sodium titanate as low voltage anode for sodium rechargeable cell with superior electrochemical properties
By Mukherjee, Anwesa; Mondal, Subhadip; Das, Debasish; Banerjee, Susanta; Majumder, S.B.
Published in Materials Letters
2021
Abstract
Surface modification by a thin layer of inert carbon or zirconia obtained by simple impregnation method are found to beneficial to improve the cycleability and rate capability of Na2Ti3O7, a promising low voltage anode for sodium ion battery. X-ray diffraction analysis confirms that the structure of Na2Ti3O7 remains unaltered after the surface modification. Both carbon and zirconia coated samples show improved electrochemical properties compared to the bare Na2Ti3O7 as both the thin coating layer helps to control unwanted solid electrolyte interface (SEI) growth at electrode–electrolyte interface. After 100 cycles, the modified materials are able to retain ~75% (for Na2Ti3O7@C) and ~68% (for Na2Ti3O7@ZrO2) of their initial capacity whereas the bare material retains only ~21% of its initial capacity.