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

• Published in: Nano energy Vol. 70; p. 104548
• Main Authors: Zhu, Ting, Hu, Ping, Cai, Congcong, Liu, Ziang, Hu, Guangwu, Kuang, Quan, Mai, Liqiang, Zhou, Liang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2020
• Subjects: Cathode material; Double carbon decoration; Na3MnTi(PO4)3; NASICON structure; Sodium-ion battery; Cathode material; Double carbon decoration; Sodium-ion battery; Na3MnTi(PO4)3; NASICON structure
• ISSN: 2211-2855
• DOI: 10.1016/j.nanoen.2020.104548

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. [Display omitted] •Semi-graphitic carbon and rGO co-functionalized NMTP has been synthesized.•NMTP/C@rGO demonstrates a specific capacity of ~114 mAh g−1 with a high energy density of 410 Wh kg−1.•In situ XRD discloses that the de-sodiation/sodiation of NMTP/C@rGO involves both solid-solution and two-phase reactions.•NMTP/C@rGO//SC full cell demonstrates ideal electrochemical performances.