On the Synergistic Effect of Carbonate Anion Directed Shape Controlled Morphology and Super P Carbon in Preparing LiFePO₄/C Cathode With Improved Lithium Intercalation Behavior

摘要

A simple and carbonic acid directed modified mechano thermal (MMT) method is identified toproduce morphology controlled nano rods of LiFePO4/C composite. The added carbonic acid plays avital role in controlling the morphology (CO 2-3 inhibition effect) and the formation of rod-like structurethat results from the unidirectional escape of CO2 gas upon calcination. MMT synthesized LiFePO4/Ccathode containing 2 wt.% conducting graphite exhibits a nominal specific capacity of 129 mAhg-1,while the corresponding LiFePO /C with 2 wt.% nickel coated graphite delivers 100 mAhg-14 capacity.On the other hand, MMT synthesized LiFePO4/C composite cathode consisting of 2 wt.% super Pcarbon exhibits an appreciable capacity of 160 mAhg-1 with an acceptable rate capability behaviour.The synergistic effect of shape controlled morphology (resulting from MMT synthesis approach) andthe addition of super P carbon in improving the electrochemical behavior of LiFePO4/C compositecathode is demonstrated in the present study.