高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

碳点调控混合相钛酸钠的储钠性能

李丹1,胡鸿辉1,侯红帅2,张生3,刘立杰4,景明俊1,吴天景1   

  1. 1.湘潭大学，“新能源装备及储能材料与器件”国家国际科技合作基地、“新型储能电池关键材料制备技术”国家地方联合工程实验室、“环境友好化学与应用”教育部重点实验室，湘潭411105； 2.中南大学化学化工学院，粉末冶金国家重点实验室，长沙410083； 3.河南大学，纳米科学与工程研究所，开封475004； 4.河南农业大学理学院，郑州450002
  • 收稿日期:2024-07-16 修回日期:2024-09-03 出版日期:2024-09-04 发布日期:2024-09-04
  • 通讯作者: 吴天景 E-mail:twu@xtu.edu.cn
  • 基金资助:
    湖南省自然科学基金杰出青年基金项目(批准号：2023JJ10041)、湖南省教育厅基金会资助(批准号：22A0114)、河南省自然科学基金(批准号：232300421228)、河南农业大学拔尖人才计划项目（批准号：30501032）、国家自然科学基金项目(批准号：22305070)资助.

Tuning Sodium Storage Of Mixed-Phase Sodium Titanate Through Carbon Dots

LI Dan1, HU Honghui1, HOU Hongshuai2, ZHANG Sheng3, LIU Lijie4, JING Mingjun1, WU Tianjing1   

  1. 1. National Base for International Science & Technology Cooperation, National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, Xiangtan University, Xiangtan 411105, China;
    2. State Key Laboratory of Powder Metallurgy, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
    3. Institute of Nanoscience and Engineering Henan University, Kaifeng 475004, China;
    4. College of Science Henan Agricultural University, Zhengzhou 450002, China
  • Received:2024-07-16 Revised:2024-09-03 Online:2024-09-04 Published:2024-09-04
  • Contact: WU Tianjing E-mail:twu@xtu.edu.cn
  • Supported by:
    Supported by the Distinguished Young Scholar Fund Project of Hunan Province Natural Science Foundation (No. 2023JJ10041), the Hunan Provincial Education Office Foundation of China (No. 22A0114), the Natural Science Foundation of Henan Province (No. 232300421228), the Topnotch Talents Program of Henan Agricultural University (No. 30501032), the National Natural Science Foundation of China (No. 22305070).

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补充材料

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摘要： Na2Ti3O7和Na2Ti6O13是两种典型的钛基储钠材料，分别具有理论容量高和结构稳定性好的优点，而调控两者在复合材料中的占比是更好发挥其电化学性能的关键。基于碳点比表面积大、表面官能团丰富等优势，本文利用一步水热法，原位制得了含碳点的钛酸钠前驱体。经过后续的热转换处理，可获得含由碳点衍生而来的导电碳的Na2Ti3O7和Na2Ti6O13复合材料（NNTO/C）。导电碳的引入不仅对混合相的组分比例进行了调控，还为复合材料提供了小电荷转移阻抗(Rct，7.48 Ω)和大比表面积（100.8 m2/g），使得NNTO/C发挥混合相协同互补作用的同时，展现出更好的储钠行为。将其用作负极时，NNTO/C在50 mA/g的电流密度下循环超两百圈，仍有143.8 mAh/g的比容量，并在1000 mA/g的大电流下展现出110 mAh/g的高比容量。本研究为电极材料两相结构的设计及碳点在储能方面的拓展应用给予了新思路。

关键词: Na2Ti3O7, Na2Ti6O13, 混合相, 碳点, 储钠行为

Abstract: Na2Ti3O7 and Na2Ti6O13 are two typical titanate-based sodium-storage materials, featuring the high theoretical capacity and favorable structure stability, respectively. Regulating the ratio of them in the composite material is the key to strengthen its electrochemical characteristics. Herein, based on the high specific surface area and abundant surface functional groups of carbon dots (CDs), sodium titanate precursors containing CDs were in-situ prepared by one-step hydrothermal method. After the thermal conversion of the precursors, a composite material (NNTO/C) of Na2Ti3O7 and Na2Ti6O13 was obtained, containing conductive carbon derived from CDs. The introduction of conductive carbon not only adjusts the composition ratio of the mixed phases, but also provides a small charge transfer impedance (Rct, 7.48 Ω) and a big specific surface area (100.8 m2/g). As a result, NNTO/C composites exhibit better sodium storage behavior while playing the synergistic interaction of mixed phases. When employed as the anode, after 200 cycles at 50 mA/g, NNTO/C still maintains a specific capacity of 143.8 mAh/g. It also exhibits a high specific capacity of 110 mAh/g at 1000 mA/g. This study suggests an innovative thinking for designing two-phase structures of electrode materials and the greater use of CDs in electrochemical energy storage.

Key words: Na2Ti3O7, Na2Ti6O13, Mixed-phases, Carbon dots, Sodium storage behavior

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