Defect-rich TiO2-delta nanocrystals confined in a mooncake-shaped porous carbon matrix as an advanced Na ion battery anode

He Hanna; Zhang Qi; Wang Haiyan; Zhang Hehe; Li Jiadong; Peng Zhiguang; Tang Yougen; Shao Minhua

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Defect-rich TiO2-delta nanocrystals confined in a mooncake-shaped porous carbon matrix as an advanced Na ion battery anode

机译：富缺陷的TiO2-δ纳米晶体被限制在月饼形多孔碳基质中，作为先进的Na离子电池阳极

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Inferior electronic conductivity and sluggish sodium ion diffusion are still two big challenges for TiO2 anode material for Na ion batteries (SIBs). Herein, we synthesize TiO2/C composites by the pyrolysis of MIL-125(Ti) precursor and successfully introduce defects to TiO2/C composite by a simple magnesium reduction. The as-prepared defect rich TiO2 delta/C composite shows mooncake-shaped morphology consisting of TiO2-delta, nanocrystals with an average particle size of 5 nm well dispersed in the carbon matrix. When used as a SIBs anode, the defect rich TiO2 delta/C composite exhibits a high reversible capacity of 330.2 mAh g(-1) at 50 mA g(1) at the voltage range of 0.001-3.0 V and long-term cycling stability with negligible decay after 5000 cycles. Compared with other four TiO2/C samples, the electrochemical performance of defect rich TiO2 delta/C is highly improved, which may benefit from the enhanced electronic/ionic conductivities owing to the defect rich features, high surface area rendering shortened electronic and ionic diffusion path, and the suppress of the TiO2 crystal aggregation during sodiation and desodiation process by the carbon matrix. (C) 2017 Elsevier B.V. All rights reserved.

机译：对于钠离子电池（SIB）的TiO2负极材料，低电子传导性和缓慢的钠离子扩散仍然是两个重大挑战。本文中，我们通过对MIL-125（Ti）前体进行热解合成了TiO2 / C复合材料，并通过简单的镁还原成功地将缺陷引入到TiO2 / C复合材料中。所制备的富含缺陷的TiO2δ/ C复合材料表现出月饼状形态，由TiO2-δ纳米晶体组成，平均粒径为5 nm，很好地分散在碳基质中。当用作SIBs阳极时，富缺陷的TiO2δ/ C复合材料在0.001-3.0 V的电压范围内在50 mA g（1）下表现出330.2 mAh g（-1）的高可逆容量5000次循环后衰减可忽略不计。与其他四个TiO2 / C样品相比，富含缺陷的TiO2 / C的电化学性能得到了极大的改善，这归因于缺陷丰富的特征，高表面积，缩短了电子和离子的扩散路径，可以受益于增强的电子/离子电导率，并通过碳基体抑制TiO2晶体在制碱和脱碱过程中的聚集。（C）2017 Elsevier B.V.保留所有权利。

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来源
《Journal of power sources》 |2017年第30期|179-188|共10页
作者
He Hanna; Zhang Qi; Wang Haiyan; Zhang Hehe; Li Jiadong; Peng Zhiguang; Tang Yougen; Shao Minhua;
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作者单位

Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China;

Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China;

Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China|Hong Kong Univ Sci & Technol, Dept Chem & Biomol Engn, Kowloon, Hong Kong, Peoples R China;

Hong Kong Univ Sci & Technol, Dept Chem & Biomol Engn, Kowloon, Hong Kong, Peoples R China;

Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China;

Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China;

Hong Kong Univ Sci & Technol, Dept Chem & Biomol Engn, Kowloon, Hong Kong, Peoples R China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
中图分类
关键词
Sodium ion battery; Titanium dioxide; Oxygen vacancies; Rate performance; Metal organic frameworks;

机译：钠离子电池二氧化钛氧空位速率性能金属有机骨架;

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Defect-rich TiO2-delta nanocrystals confined in a mooncake-shaped porous carbon matrix as an advanced Na ion battery anode

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