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

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

doi:10.3969/j.issn.0438-1157.2013.01.044

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

更新时间：2025-12-10

- TiO₂-B fibres derived from K₂Ti₄O₉ as fast lithium intercalation negative material
- CIESC Journal Issue 1, Pages: 374-380(2013)
- 作者机构：
  
  南京工业大学材料化学工程国家重点实验室,江苏,南京,210009
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2013.01.044
  CLC： M912.9
- Online First：05 January 2013，
  
  Published：05 January 2013
- 稿件说明：
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ZHUANG Wei, LV Linghong, WU Xinbing, et al. TiO₂-B fibres derived from K₂Ti₄O₉ as fast lithium intercalation negative material[J]. CIESC Journal, 2013, (1): 374-380. DOI: 10.3969/j.issn.0438-1157.2013.01.044.
DOI：

ZHUANG Wei, LV Linghong, WU Xinbing, et al. TiO₂-B fibres derived from K₂Ti₄O₉ as fast lithium intercalation negative material[J]. CIESC Journal, 2013, (1): 374-380. DOI: 10.3969/j.issn.0438-1157.2013.01.044. DOI：

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。

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).

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