The effect of NaMnO formation in Na-modified spinel LiMnO.

NaMnO impure phase is formed during the synthetic process of Na-modified spinel LiMnO by solid state reaction which is confirmed by x-ray diffraction analysis. Scanning electron microscopy, transmission electron microscopy and galvanostatic charge-discharge measurements are carried out to investigate the effect of the formation of NaMnO impurity on the morphology and electrochemical properties of the spinel material. The results show that the spinel material with impure phase exhibits improved cyclability compared to that of the pristine LiMnO. The improved electrochemical performance is mainly ascribed to the improved crystallinity of the spinel particles, enhanced stability of the spinel structure and good electronic conductivity of the composite. [ABSTRACT FROM AUTHOR]