New P2-Na0.70Mn0.60Ni0.30Co0.10O2 layered oxide as electrode material for Na-ion batteries

Jun Yoshida (1, 2) , Elodie Guérin (1) , Mélissa Arnault (1) , Cédric Constantin (1) , Benoit Mortemard de Boisse (1) , Dany Carlier (1) , Marie Guignard (1) , Claude Delmas (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 Toyota Motor Europe

Sodium layered oxide, Na0.70Mn0.60Ni0.30Co0.10O2, with a P2-type structure was synthesized by a co-precipitation method and characterized as positive electrode of sodium batteries. The P2-NaxMn0.60Ni0.30Co0.10O2 electrode delivered a high specific capacity of 185 mAh/g in the 1.5–4.3 V range at 1st cycle at C/20 rate; however, rapid capacity decay is observed. In the 1.7–4.0 V range the capacity is equal to 125 mAh/g with a fading considerably reduced. The rate capability is reasonably good. According to the electrochemical profile, a potential plateau around 4.2 V vs. Na+/Na, meaning a bi-phasic domain, and several voltage drops that could be related to single phase domains in a narrow sodium content range are observed. Even if the capacity decreases when the battery is cycled above 4.0 V, there is no irreversible structural change.

Domaines: Matériaux; Chimie inorganique

Jun Yoshida, Elodie Guérin, Mélissa Arnault, Cédric Constantin, Benoit Mortemard de Boisse, et al.. New P2-Na0.70Mn0.60Ni0.30Co0.10O2 layered oxide as electrode material for Na-ion batteries. Journal of The Electrochemical Society, 2014, 161 (14), pp.A1987-A1991. ⟨10.1149/2.0121414jes⟩. ⟨hal-01080502⟩