Synthesis of Li2FeSiO4/C Composite as Cathode Materials for Lithium Ion Battery via a New Citric Acid-Assisted Sol-Gel Process

Abstract

A new citric acid-assisted sol-gel process is introduced in this work with the aim of getting Li2FeSiO4/C composite. The effect of carbon coating on the structure, morphological and electrochemical characteristics is studied in detail. The Li2FeSiO4/C composite with 13.6% carbon delivers much higher electrochemical performance, in terms of reversible discharge capacity, cycling performance and rate capability. At 0.2 C and 2 C, it exhibits a discharge capacity of 138 mAh g-1 and 64 mAh g-1, respectively, and after 100 cycles at 0.2 C, 97.1 % of the maximum discharge capacity is retained.