Preparation and electrochemical properties of Li4Ti5O12/Ti4O7 composite for lithium-ion batteries

被引：10

作者：

Zhang, Xiaoyan ^{[1
]}

Zhong, Xiaoxi ^{[2
]}

Xu, Wen ^{[1
]}

Li, Xing ^{[1
]}

Liu, Wanying ^{[1
]}

Lin, Yuanhua ^{[1
,3
]}

机构：

[1] Southwest Petr Univ, Sch Mat Sci & Engn, Chengdu 610500, Sichuan, Peoples R China

[2] Chengdu Univ Informat Technol, Sichuan Prov Key Lab Informat Mat & Devices Appli, Chengdu 610225, Sichuan, Peoples R China

[3] Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Sichuan, Peoples R China

来源：

IONICS | 2018年 / 24卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Lithium-ion batteries; Li4Ti5O12; Ti4O7; Rate capability; OXYGEN REDUCTION; ANODE MATERIAL; NANO-TUBES; PERFORMANCE;

D O I：

10.1007/s11581-017-2207-6

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：

In order to improve the rate capability of Li4Ti5O12, Ti4O7 powder was successfully fabricated by improved hydrogen reduction method, then a dual-phase composite Li4Ti5O12/Ti4O7 has been synthesized as anode material for lithium-ion batteries. It is found that the Li4Ti5O12/Ti4O7 composite shows higher reversible capacity and better rate capability compared to Li4Ti5O12. According to the charge-discharge tests, the Li4Ti5O12/Ti4O7 composite exhibits excellent rate capability of 172.3 mAh g(-1) at 0.2 C, which is close to the theoretical value of the spinel Li4Ti5O12. More impressively, the reversible capacity of Li4Ti5O12/Ti4O7 composite is 103.1 mAh g(-1) at the current density of 20 C after 100th cycles, and it maintains 84.8% of the initial discharge capacity, whereas that of the bare spinel Li4Ti5O12 is only 22.3 mAh g(-1) with a capacity retention of 31.1%. The results indicate that Li4Ti5O12/Ti4O7 composite could be a promising anode material with relative high capacity and good rate capability for lithium-ion batteries.

引用

页码：379 / 384

页数：6

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