Promotional role of Li4Ti5O12 on SnO2-based materials electrochemical performances

被引：6

作者：

Hu, Xuebu ^{[1
]}

Zhang, Yonglong ^{[1
]}

Zeng, Tianbiao ^{[1
]}

Zhong, Dengjie ^{[1
]}

Zhou, Dewen ^{[1
]}

Zhang, Min ^{[1
]}

机构：

[1] Chongqing Univ Technol, Coll Chem & Chem Engn, Chongqing 400054, Peoples R China

来源：

IONICS | 2015年 / 21卷 / 12期

基金：

中国国家自然科学基金;

关键词：

SnO2-based materials; Li4Ti5O12; Lithium ionic conductor; Electronic conductor; ANODE MATERIALS; HIERARCHICAL SNO2; CARBON; NANOSTRUCTURES; NANOCOMPOSITE; COMPOSITES; NANOWIRES;

D O I：

10.1007/s11581-015-1563-3

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

SnO2-based materials consisting of core-shell structure (SnO2/C)@C microspheres and Li4Ti5O12/C composites were prepared via a hydrothermal method and solid-state reaction. The effects of Li4Ti5O12/C content on the electrochemical performances of SnO2-based materials were systematically studied. The results illustrate that the SnO2-based materials with Li4Ti5O12 show improved cycling performance and rate capability as compared to pure SnO2 and (SnO2/C)@C composites, which is attributed to the multi-functional roles of the electronic conductor carbon and the lithium ionic conductor Li4Ti5O12. Due to the presence of Li4Ti5O12, the significantly increased lithium-ion diffusion coefficient and Warburg impedance of SnO2-based anode materials lead to overall high lithium ionic conductivity. The "combined effect" of the electronic conductor and the lithium ionic conductor is an efficient way for the SnO2 anode to suppress volume expansion and improve electrochemical performances, especially rate capability.

引用

页码：3289 / 3294

页数：6

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