Structural and Electrochemical Characterizations of P2 and New O3-Na_xMn_1-yFe_yO₂Phases Prepared by Auto-Combustion Synthesis for Na-Ion Batteries

Abstract

Using auto-combustion synthesis route followed by a 1000 • C heat-treatment, we succeeded to prepare four Na x (Mn,Fe

Investigation of Al-doping effects on the NaFe0.5Mn0.5O2 cathode for Na-ion batteries

“…Thus, Na-Fe-Mn-containing structures could be ideal as low-cost Na + electrodes. Among Na-ion host candidates based on Fe and Mn, various Na-deficient P2-type layered Na 2/3 (Fe y Mn 1-y )O 2 compositions have been investigated as promising high capacity cathode materials, showing energy density only slightly inferior to similar lithium metal oxides [4,5,6].…”

NaFe3(HPO3)2((H,F)PO2OH)6: A Potential Cathode Material and a Novel Ferrimagnet

“…Due to the similarity in the operation of lithium and sodium ion batteries, sodium equivalents of the lithium based electrode materials, such as hard carbon, phosphates, pyrophosphates and oxides, have been described. [8][9][10] Layered oxides, AMO 2 , where A = Li, Na and M is one or more transition metals, exhibit very different behavior depending on the alkali ion. For example, electrochemically inactive LiFeO 2 and LiCrO 2 behave well in their sodium forms, NaFeO 2 and NaCrO 2 , due to the accessibility of the Fe 4+ and Cr 4+ states when A = Na.…”

“…17 Solid solutions of Mn and Fe, Na x [Mn 1-y Fe y ]O 2 , adopting either O3 or P2 structures, have also been investigated. 10,18 Polyoxyanion compounds, particularly phosphates, are receiving considerable attention as alternative cathodes for rechargeable lithium and sodium batteries. The strong binding of the oxygen within polyoxyanions enhances stability and thus safety, compared with transition metal oxides.…”

Radially aligned hierarchical columnar structure as a cathode material for high energy density sodium-ion batteries

“…Recently, several types of insertion materials have been introduced as cathode materials for sodium-ion batteries (SIBs) including P2-types [9][10][11][12][13][14][15][16] , O3-types [17][18][19][20][21][22][23][24][25][26][27][28][29] , pyrophosphates [30][31][32] and organo-compounds [33][34][35] . Owing to the large ionic size of Na þ ions (1.02 Å), their insertion into a spinel framework does not readily occur.…”