Mesoporous FePO_4 with Enhanced Electrochemical Performance as Cathode Materials of Rechargeable Lithium Batteries

摘要

FePO_4 is an attractive cathode material for lithium batteries, but its practical capacity is limited by the poor lithium intercalation/deintercalation kinetics. In this paper, a mesoporous structure has been imported into FePO_4 to improve the kinetics by a modified surfactant template method. Electrochemical tests showed that mesoporous FePO_4 fired at 450 deg C with P123/(Fe+P) molar ratio 0.039 delivered 120 mAh g~(-1) at 0.1 C and 65 mAh g~(-1) at 3C, which was higher than that of reported amorphous and crystalline FePO_4. These results help to understand the role of mesostructure in electrode materials for rechargeable lithium batteries.