Improved performances of mechanical-activated LiMn2O4/MWNTs cathode for aqueous rechargeable lithium batteries

被引：32

作者：

Chen, Shengyao ^{[1
]}

Mi, Changhuan ^{[1
]}

Su, Linghao ^{[1
]}

Gao, Bo ^{[1
]}

Fu, Qingbin ^{[1
]}

Zhang, Xiaogang ^{[1
]}

机构：

[1] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Engn, Nanjing 210016, Peoples R China

来源：

JOURNAL OF APPLIED ELECTROCHEMISTRY | 2009年 / 39卷 / 10期

基金：

中国国家自然科学基金;

关键词：

LiMn2O4; MWNTs; Mechanical activated; Rate capability; ION BATTERIES; ELECTROCHEMICAL PERFORMANCE; CARBON NANOTUBES; RATE CAPABILITY; ELECTRODES; INTERCALATION; SPINEL; EXTRACTION; IMPEDANCE; OXIDE;

D O I：

10.1007/s10800-009-9903-5

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

LiMn2O4/multi-walled carbon nanotubes (MWNTs) composite was synthesized by mechanical activation reaction followed by a heat-treatment (500 A degrees C). The LiMn2O4 and LiMn2O4/MWNTs as cathodes were investigated in 1 M Li2SO4 by cyclic voltammetry (CV), galvanostatic charge/discharge (GC), and electrochemical impedance spectroscopy (EIS). The LiMn2O4/MWNTs cathode delivered higher discharge capacity (117 mAh g(-1)) than LiMn2O4 (84.6 mAh g(-1)). Furthermore, the results from EIS showed that LiMn2O4/MWNTs had a faster kinetic process for lithium ion intercalation/de-intercalation than LiMn2O4. Besides, LiMn2O4/MWNTs had better cycling stability and rate capability than LiMn2O4, which was confirmed by GC testing. SEM images showed that a three-dimensional network structure was formed during the mechanical activation, giving a decrease of particle size.

引用

页码：1943 / 1948

页数：6

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