Li4NiTeO6 as a positive electrode for Li-ion batteries

Abstract

Layered Li₄NiTeO₆ was shown to reversibly release/uptake ∼2 lithium ions per formula unit with fair capacity retention upon long cycling. The Li electrochemical reactivity mechanism differs from that of Li₂MO₃ and is rooted in the Ni⁴⁺/Ni²⁺ redox couple, that takes place at a higher potential than conventional LiNi_1−xMn_xO₂ compounds. We explain this in terms of inductive effect due to Te⁶⁺ ions (or the TeO₆⁶⁻ moiety).