▎ 摘　　要

Graphene oxide, an oxidized derivative of graphene, has many intriguing properties, such as amphi-philicity, negative charge, and easy mass production. However, due to the electronic insulation, graphene oxide cannot be directly used as a conductive agent for lithium batteries before reduction. Here we have demonstrated the enhanced rate and cycle capability of LiMn0.7Fe0.3PO4 with in situ electrochemically reduced graphene oxide by starting from discharge to 1.5 V vs. Li+/Li. For example, LiMn0.7Fe0.3PO4 with 2 wt% electrochemically reduced graphene oxide can obtain a high discharge capacity of similar to 83 mAh g(-1) at 30C and capacity retention of similar to 90% at 1C after 200 cycles, much higher performance than that without graphene oxide (similar to 10 mAh g(-1) and similar to 56%, respectively). Moreover, the cathode with in situ electrochemically reduced graphene oxide also shows better performances than that with the externally reduced graphene oxide. The boosted performance is attributed to the effective conductive network formed by the well-dispersed graphene oxide. (C) 2019 Elsevier B.V. All rights reserved.