Chemically Lithiated TiO2 Heterostructured Nanosheet Anode with Excellent Rate Capability and Long Cycle Life for High-Performance Lithium-Ion Batteries

被引：98

作者：

Balogun, Muhammad-Sadeeq ^{[1
]}

Zhu, Yikun ^{[1
]}

Qiu, Weitao ^{[1
]}

Luo, Yang ^{[1
]}

Huang, Yongchao ^{[1
]}

Liang, Chaolun ^{[2
]}

Lu, Xihong ^{[1
]}

Tong, Yexiang ^{[1
]}

机构：

[1] Sun Yat Sen Univ, Sch Chem & Chem Engn, MOE Key Lab Bioinorgan & Synthet Chem, KLGHEI Environm & Energy Chem, Guangzhou 510275, Guangdong, Peoples R China

[2] Sun Yat Sen Univ, Instrumental Anal & Res Ctr, Guangzhou 510275, Guangdong, Peoples R China

来源：

ACS APPLIED MATERIALS & INTERFACES | 2015年 / 7卷 / 46期

基金：

中国国家自然科学基金;

关键词：

TiO2-Li4Ti5O12; heterostructured nanosheet; phase boundary; oxygen vacancy; lithium ion battery; HIGH-SURFACE-AREA; NANOTUBE ARRAYS; NANOWIRE ARRAYS; LI4TI5O12-TIO2; NANOSHEETS; HIGH-ENERGY; 001; FACETS; NANORODS; NANOCRYSTALS; STORAGE; ELECTRODES;

D O I：

10.1021/acsami.5b09610

中图分类号：

TB3 [工程材料学];

学科分类号：

082905 [生物质能源与材料];

摘要：

A new form of dual-phase heterostructured nanosheet comprised of oxygen-deficient TiO2/Li4Ti5O12 has been successfully synthesized and used as anode material for lithium ion batteries. With the three-dimensional (3D) Ti mesh as both the conducting substrate and the Ti3+/Ti4+ source, blue anatase Ti3+/TiO2 nanosheets were grown by a hydrothermal reaction. By controlling the chemical lithiation period of TiO2 nanosheets, a phase boundary was created between the TiO2 and the newly formed Li4Ti5O12, which contribute additional capacity benefiting from favorable charge separation between the two phase interfaces. Through further hydrogenation of the 3D TiO2/Li4Ti5O12 heterostructured nanosheets (denoted as H-TiO2/LTO HNS), an extraordinary rate performance with capacity of 174 mAh g(-1) at 200 C and outstanding long-term cycling stability with only an similar to 6% decrease of its initial specific capacity after 6000 cycles were delivered. The heterostructured nanosheet morphology provides a short length of lithium diffusion and high electrode/electrolyte contact area, which could also explain the remarkable lithium storage performance. In addition, the full battery assembled based on the H-TiO2/LTO anode achieves high energy and power densities.

引用

页码：25991 / 26003

页数：13

共 72 条

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