Design and fabrication of nitrogen-doped graphene-promoted Na3MnTi(PO4)3@C cathode with three-electron reactions for sodium-ion storage

• Published in: Solid state sciences Vol. 156; p. 107678
• Main Authors: Luo, Peifang, Huang, Zan, Wang, Tingyu, Xiao, Hua, Ma, Xiuhua, Yan, Ruihan, Zhao, Gengfeng
• Format: Journal Article
• Language: English
• Published: Elsevier Masson SAS 01.10.2024
• Subjects: Battery performance; Carbon coating; Nitrogen-doped graphene; NMTP; Sodium-ion storage; Battery performance; Nitrogen-doped graphene; Carbon coating; NMTP; Sodium-ion storage
• ISSN: 1293-2558
• DOI: 10.1016/j.solidstatesciences.2024.107678

As a novel cathode material for sodium-ion batteries, Na3MnTi(PO4)3 (denoted as NMTP) has received great attention because of its abundant natural resources, excellent safety, low toxicity as well as three-electron reactions. Unfortunately, the pure NMTP cathode displays a bad conductivity, resulting in an inferior electrochemical performance for sodium energy storage. Herein, we introduce a good route to fabricate the nitrogen-doped graphene-decorated NMTP@C (denoted as NG-NMTP@C) composite with superior rate property and superior cycle stability for the first time. In this fabricated material, the nitrogen-doped graphene nanosheets are dispersed into the NMTP@C particles. Compared to NMTP@C, the prepared NG-NMTP@C cathode possesses better cycle stability and higher capacity. It shows the capacity of 173.1 mAh g−1 at 0.1 C and presents the high capacity retention of around 97.1 % at 10.0 C over 400 cycles. Therefore, this fabricated NG-NMTP@C nanocomposite can be employed as the novel positive electrode in sodium-ion storage. [Display omitted] •N-doped graphene-decorated Na3MnTi(PO4)3@C has been synthesized for the first time.•N-doped graphene can greatly enhance the conductivity of Na3MnTi(PO4)3@C.•The resulted cathode presents superior high-rate capability and cycling stability.