Free-Standing Layer-By-Layer Hybrid Thin Film of Graphene-MnO2 Nanotube as Anode for Lithium Ion Batteries

被引:257
作者
Yu, Aiping [1 ]
Park, Hey Woong [1 ]
Davies, Aaron [1 ]
Higgins, Drew C.
Chen, Zhongwei [1 ]
Xiao, Xingcheng [2 ]
机构
[1] Univ Waterloo, Dept Chem Engn, Waterloo, ON N2L 3G1, Canada
[2] Gen Motors Global Res & Dev Ctr, Warren, MI 48090 USA
来源
JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2011年 / 2卷 / 15期
基金
加拿大自然科学与工程研究理事会;
关键词
NEGATIVE-ELECTRODE MATERIALS; REVERSIBLE CAPACITY; LI STORAGE; OXIDE; PERFORMANCE;
D O I
10.1021/jz200836h
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
Free-standing layer-by-layer assembled hybrid graphene-MnO2 nanotube (NT) thin films were prepared by an ultrafiltration technique and studied as anodes for lithium ion batteries. Each thin layer of graphene provides not only conductive pathways accelerating a conversion reaction of MnO2 but also buffer layers to maintain electrical contact with MnO2 NT during lithium insertion/extraction. In addition, the unique structures of the thin film provide porous structures that enhance Li ion diffusion into the structure. The graphene-MnO2 NT films as anode present excellent cycle and rate capabilities with a reversible specific capacity based on electrode composite mass of 495 mAh/g at 100 mA/g after 40 cycles with various current rates from 100 to 1600 mA/g. On the contrary, graphene-free MnO2 NT electrodes demonstrate only 140 mAh/g at 80 mA/g after 10 cycles. Furthermore, at a high current rate of 1600 mA/g, the charge capacity of graphene-MnO2 NT film reached 208 mAh/g.
引用
收藏
页码:1855 / 1860
页数:6
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