TiO2/C复合材料用于钠离子电池负极的性能研究 |
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引用本文: | 徐梦,刘博文,吴昱,刘庆雷.TiO2/C复合材料用于钠离子电池负极的性能研究[J].中国材料进展,2021(4):301-307. |
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作者姓名: | 徐梦 刘博文 吴昱 刘庆雷 |
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作者单位: | 上海交通大学金属基复合材料国家重点实验室;中国人民解放军军事科学院防化研究院 |
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基金项目: | 国家自然科学基金项目(51772187);上海市科委基础研究项目(18JC1410500,17ZR1441400,17520710600)。 |
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摘 要: | 近年来,TiO2作为钠离子电池(NIB)负极材料,因其低成本和高稳定性等优势受到广泛关注。但受TiO2本征电子导电性的固有限制,使得TiO2作为NIB负极材料导电性较差,导致其容量和倍率等性能不理想。利用海藻酸钠与金属离子自主交联反应的特性,将反应产物在最佳温度下进行简单碳化,制备了具有分级多孔结构的TiO2/C复合材料,其中TiO2纳米颗粒均匀地分布在多孔互连的碳基体中,该结构提升了复合材料导电性的同时扩展了钠离子反应的附着位点。将TiO2/C复合材料用于NIB负极材料,在100 mA·g-1的电流密度下循环300圈后,电池可逆比容量维持在180.4 mAh·g-1;进一步,在更高的1000 mA·g-1电流密度下经过1000次循环后,电池可逆比容量维持在102.3 mAh·g-1,充分显示出TiO2/C复合材料作为NIB负极材料的应用潜能。
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关 键 词: | 海藻酸钠 自主交联 TiO2/C复合材料 多孔结构 钠离子电池 |
Study on the Performance of TiO2/C Hybrids as Anode Materials of Sodium-Ion Batteries |
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Authors: | XU Meng LIU Bowen WU Yu LIU Qinglei |
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Affiliation: | (The State Key Laboratory of Metal Matrix Composites,Shanghai Jiao Tong University,Shanghai 200240,China;Research Institute of Chemical Defense,Academy of Military Sciences PLA China,Beijing 102205,China) |
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Abstract: | In recent years,titanium dioxide(TiO2)has attracted a lot of attention as the active anode material in sodium rechargeable battery(NIB)due to its low cost and stability.However,in practice the intrinsically slow transport kinetics of electrons in TiO2prevent optimal electrochemical performance.Here,we prepared a hierarchical porous TiO2/C hybrid with oxygen vacancies through a simple carbonization of a Na+controlled Ti-alginate self-crosslinking for the high-performance anode of sodium-ion batteries.Owing to the combination of hierarchical porous carbon matrix and the TiO2nano-particles,the TiO2/C provided a capacity of 180.4 mAh·g-1 after 300 cycles at a current density of 100 mA·g-1,and delivered an excellent reversible capacity of 102.3 mAh·g-1 after 1000 cycles even at a higher current density of 1000 mA·g-1.Such good electrochemical performance has demonstrated the great potential of TiO2/C hybrids used as anodes for NIB. |
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Keywords: | alginate self-crosslinking TiO2/C hybrids porous structure sodium-ion battery |
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