Carbon Coating of LiMn1-xFexPO4 Using Amphiphilic Carbonaceous Material for Improvement of Electrochemical Performances

摘要

Excellent stability, low cost, and environmentally benign make the olivine structured LiFePO4 be the promising cathode materials using in Li-ion batteries. There is a growing interest in LiMnPO4 for its higher energy density than LiFePO4. To enhance the transport properties of LiMnPO4, LiMn_(1?x)Fe_xPO4/C (x = 0.2, 0.3, 0.4, 0.5) composites were synthesized by substituting Mn~(2+) with Fe ~(2+) , and were coated by carbon layers originated from the pitch-based amphiphilic carbonaceous material (ACM). ACM has many hydrophilic groups and easily disperses in water or ethanol. It also mainly consists of aromatic molecules and more favorably forms a thin carbon coating on the particle surface after carbonization.