Na0.44MnO2 Positive Electrode for Advanced Na-Ion Batteries: From Nanoplatelets to Nanofibers
Room-temperature sodium-ion battery (NIB) has re-attracted increasing attention in recent years because of its unlimited raw material resources and physical and chemical similarity to Lithium-ion battery. Recently, the world’s first Na-ion battery powered vehicle has been demonstrated by British company-Faradion, which further proves the capability of this new type of battery technology. Research on appropriate cathode materials for NIB started in the 1970s along with Li-ion batteries, and many intercalation compounds have been studied including layered oxides (NaxMO2 (M=3d transition metal such as Mn, Fe, Co, Cr, Ni, V, Ti etc.)), polyanion compounds (NaxMPO4, NaxMPO4F, (M= Mn, Fe, V, Ti etc.) and other compounds such as TiS2 , TaS2, MoSe2, and SnSeyS2−y etc. Among these, Na0.44MnO2 has attracted lots of attention as a cathode material because of its wide tunnel structure with high theoretical specific capacity (122 mAhg-1) and good cyclability. Na0.44MnO2 has an orthorhombic crystal structure with MnO6 octahedra and MnO5square pyramid, and the latter forms edge-linked chains linked to two double and one triple octahedral chain by the vertices forming two types of channels. The wide tunnel structure helps accommodate some of the stresses associated with structural changes during cycling.
© 2016 ECS - The Electrochemical Society
Zhou, Xuan Joe; Wang, Yaping; and Fu, Bi, "Na0.44MnO2 Positive Electrode for Advanced Na-Ion Batteries: From Nanoplatelets to Nanofibers" (2016). Electrical & Computer Engineering Publications. 24.