Synthesis and Morphological Influence on High Capacity LiMnBO_3 Cathode Material for New Generation Lithium Ion Batteries

摘要

Nanosized LiMnBO_3 with enhanced capacity has been synthesized by a sol gel method. The effect of annealing atmosphere on its morphology and electrochemical properties has been investigated. Powder X-ray diffractometer (XRD) results reveal co-existence of hexagonal and monoclinic phases in both Argon (Ar) and Nitrogen (N_2) annealed samples. SEM images indicate diverse morphology of elongated spherical shape in Ar annealed and tetragonal rod shaped particles in N_2 annealed samples. The dual phased electrode material under Ar atmosphere exhibit excellent electrochemical performance and delivered a high discharge capacity of 208 mAhg~1 and good reversibility. Enhanced capacity deliverance is attributed to mixed morphology and mixed phase formation in the present LiMnBO_3 nanocrystallites.