TiO2-B fibres derived from K2Ti4O9 as fast lithium intercalation negative material

doi:10.3969/j.issn.0438-1157.2013.01.044

CIESC Journal ›› 2013, Vol. 64 ›› Issue (1): 374-380.DOI: 10.3969/j.issn.0438-1157.2013.01.044

TiO₂-B fibres derived from K₂Ti₄O₉ as fast lithium intercalation negative material

ZHUANG Wei, LV Linghong, WU Xinbing, MENG Meng, ZHU Yudan, LU Xiaohua

State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, Nanjing 210009, Jiangsu, China

Received:2012-05-02 Revised:2012-06-11 Online:2013-01-05 Published:2013-01-05
Supported by:
supported by Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT 0732), the National Natural Science Foundation of China (21136004, 20736002, 21176113, 20876073,21136001), China Postdoctoral Science Foundation (20110491407) and National Basic Research Program of China (2009CB623407, 2009CB219902,2009CB226103).

K₂Ti₄O₉制备TiO₂-B纤维快速嵌锂负极材料

庄伟, 吕玲红, 邬新兵, 蒙萌, 朱育丹, 陆小华

南京工业大学材料化学工程国家重点实验室,江苏南京 210009

通讯作者: 吕玲红
作者简介:庄伟(1985—),男,博士研究生。
基金资助:
教育部创新团队项目(PCSIRT0732);国家自然科学基金项目(21136004, 20736002, 21176113, 20876073, 21136001);中国博士后科学基金项目(20110491407);国家重点基础研究发展计划项目(2009CB623407, 2009CB219902, 2009CB226103)。

Abstract

Abstract: TiO₂-B fibers were obtained by heat treatment of the precursor of tetratitanate (H₂Ti₄O₉· xH₂O), which was derived from potassium tetratitanate (K₂Ti₄O₉) via ion exchange.Structure characterization showed that TiO₂-B fibers sintered at 600℃ still maintained pure phase and high crystallinity.Lithium insertion performance indicated that the capacity performance of this TiO₂-B material sintered at 600℃ was up to 225 mA·h·g^-1, and was 50 mA·h·g^-1 (i.e.22.5%) higher than that of the anatase material with similar structure.The TiO₂-B fibers exhibited excellent rate performance mainly because the open structure of the TiO₂-B fibers led to fast lithium-ion diffusion coefficient of 1.92×10^-7 cm²·s^-1, which was nearly 8 times higher than that of anatase material.1 C stability test showed that the capacity of TiO₂-B fiber was 159 mA·h·g^-1 after 80 cycles, which was about 1.5 times higher than the capacity of anatase material (64 mA·h·g^-1).

Key words: TiO₂-B fibres, potassium tetratitanate, negative materials, lithium ion batteries

摘要： 以四钛酸钾(K₂Ti₄O₉)经离子交换得到的四钛酸(H₂Ti₄O₉·xH₂O)为前驱体,经过不同温度热处理得到不同结晶度的氧化钛纤维。对样品进行XRD、Raman、FE-SEM及TEM等结构形貌表征,发现600℃烧结可得到纯相、高结晶度的TiO₂-B材料。并考察了其作为锂离子电池负极材料的容量、倍率和稳定性。嵌锂性能测试发现,TiO₂-B相材料的首放容量可以达到225 mA·h·g^-1,比相近结构的锐钛矿(anatase)相材料高50 mA·h·g^-1,即22.5%的容量。与相似结构anatase材料的倍率结果对比发现,TiO₂-B纤维倍率性能更高,主要是TiO₂-B纤维的开放结构使其锂离子扩散系数达到1.92×10^-7 cm²·s^-1,是anatase相材料的8倍。1 C稳定性测试发现循环80次后容量仍然高于anatase,且最终容量稳定在159 mA·h·g^-1,比anatase材料的64 mA·h·g^-1高1.5倍。

关键词: TiO₂-B纤维, 四钛酸钾, 负极材料, 锂离子电池

CLC Number:

TM912.9

ZHUANG Wei, LV Linghong, WU Xinbing, MENG Meng, ZHU Yudan, LU Xiaohua. TiO₂-B fibres derived from K₂Ti₄O₉ as fast lithium intercalation negative material[J]. CIESC Journal, 2013, 64(1): 374-380.

庄伟, 吕玲红, 邬新兵, 蒙萌, 朱育丹, 陆小华. K₂Ti₄O₉制备TiO₂-B纤维快速嵌锂负极材料[J]. 化工学报, 2013, 64(1): 374-380.

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TiO₂-B fibres derived from K₂Ti₄O₉ as fast lithium intercalation negative material

K₂Ti₄O₉制备TiO₂-B纤维快速嵌锂负极材料

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