Dual carbon decorated Na3MnTi(PO4)3: A high-energy-density cathode material for sodium-ion batteries

Abstract

NASICON-structured Na3MnTi(PO4)3 (NMTP) is a high-energy sodium-ion battery (SIB) cathode material. However, the low rate capability and unsatisfactory cycle life limit its practical applications. Herein, a dual carbon decoration strategy has been proposed to tackle the above-mentioned issues of NMTP. The semi-graphitic carbon and reduced graphene oxide co-functionalized NMTP (NMTP/C@rGO) demonstrates a specific capacity of ~114 mAh g−1, reaching a high energy density of ~410 Wh kg−1 with an average discharge potential of ~3.6 V. Besides, the NMTP/C@rGO also manifests long-term durability and high rate capability. More importantly, the NMTP/C@rGO also demonstrates ideal electrochemical properties in NMTP/C@rGO//soft carbon full cells. The impressive electrochemical performances make the NMTP/C@rGO a reliable cathode material for SIBs.