Absence of phase transformation at low temperature in Co-doped LiMn2O4 samples

Abstract

The phase transition in spinel LiMn₂O₄ was investigated using powder synchrotron radiation diffraction. A transition from cubic (Fd3m) to orthorhombic (Fddd) was observed around T = 220 K. Increasing the average valence of Mn by doping Co into the [Mn₂O₄] framework, LiMn_1.9Co_0.1O₄, reduced the concentration of Mn³⁺ ions, suppressed the Jahn–Teller distortion and the cubic phase was retained at low temperature.

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