Bi Hongwei, Zhu Shengli, Liang Yanqin, Jiang Hui, Li Zhaoyang, Wu Shuilin, Wei Hao, Chang Chuntao, Wang Hao, Cui Zhenduo
School of Materials Science and Engineering, Tianjin University, Tianjin300350, China.
Tianjin Key Laboratory of Composite and Functional Materials, Tianjin300350, China.
ACS Omega. 2023 Jan 30;8(6):5893-5900. doi: 10.1021/acsomega.2c07689. eCollection 2023 Feb 14.
The group "beyond Li-ion" batteries (Na/Mg-ion batteries) have the advantages of abundant reserves and high theoretical specific capacity. However, the sluggish kinetics resulting from large ion radius (Na) and polarity (Mg) seriously limit the battery performance. Herein, we prepared Nb-doped anatase TiO with Ti vacancies (Nb-TiO) through a simple solvothermal and subsequent calcination process. The Nb doping widens the channels for metal ion diffusion, and the cationic vacancies can act as ion storage sites and improve the electrode conductivity. Thus, Nb-TiO exhibits improved performance for rechargeable Na/Mg-ion batteries.
“超越锂离子”电池组（钠/镁离子电池）具有储量丰富和理论比容量高的优点。然而，由大离子半径（钠）和极性（镁）导致的缓慢动力学严重限制了电池性能。在此，我们通过简单的溶剂热法及后续煅烧过程制备了具有钛空位的铌掺杂锐钛矿型二氧化钛（Nb-TiO）。铌掺杂拓宽了金属离子扩散通道，阳离子空位可作为离子存储位点并提高电极导电性。因此，Nb-TiO在可充电钠/镁离子电池中表现出改善的性能。
