Electrochemical Performance of Sol-Gel Derived Hexagonal LiMnBO3 Cathode Material for Lithium-Ion Batteries

Abstract

An attempt has been made to synthesize hexagonal LiMnBO3 (h-LMB) through sol-gel technique. The synthesized h-LiMnBO3 have been examined for their physical and electrochemical characteristics by X-ray diffraction analysis (XRD) and Thermal analysis (TG), Scanning electron microscopy (SEM), Raman spectroscopy as well as through charge –discharge cycling. XRD results revealed the existence of hexagonal polymorphs with P6 space group. Stability of h-LiMnBO3 material is analyzed by thermal analysis. SEM image shows spherical shape nanoparticle with the average diameter 50 nm. Raman spectroscopy result indicates the presence of Mn-O vibration. An electrochemical study indicates the sol-gel derived hexagonal LiMnBO3 delivers a first charging capacity of 97.5 mAh g-1 and discharging capacity of 55. 85 mAh g-1 within the potential window of 2V-4.5 V at C/10 rate and retaining a reversible discharge capacity of 42.71 mAh g-1 at the 10th cycle.