Electrochemical Characterizations Of Li_(2.6)co_(0.4)n/graphite Anodes For Lithium Ion Batteries

摘要

Li_(2.6)Co_(0.4)N anode material was prepared by solid-state reaction. The material was used to prepare Li_(2.6)Co_(0.4)N/ natural graphite composite anode materials with the aim to improve the electrochemical performance of natural graphite. Natural graphite showed a low initial columbic efficiency of 69%, which was improved to ～100% by adding 20 wt.% of Li_(2.6)Co_(0.4)N into the material. On the other hand, the composite materials showed better capacity retention than both pure Li_(2.6)Co_(0.4)N and natural graphite. The material containing 20 wt.% of Li_(2.6)Co_(0.4)N exhibited a reversible discharge capacity of 243 mAh g~(-1) after thirty cycles, as compared to a capacity of 212 mAh g~(-1) for natural graphite.