Development of a high-performance anode for lithium ion batteries using novel ordered mesoporous tungsten oxide materials with high electrical conductivity
Songhun Yoon,Changshin Jo,Soon Young Noh,Chul Wee Lee,Jun Ho Song,Jinwoo Lee
Physical Chemistry Chemical Physics Pub Date : 05/09/2011 00:00:00 , DOI:10.1039/C1CP20940J
Abstract

An ordered mesoporous WO3−X with high electrical conductivity (m-WO3−X) was prepared and evaluated as an anode material for lithium ion batteries (LIBs). Ordered mesoporous tungsten trioxide (m-WO3) with an identical pore structure to that of m-WO3−X and bulk WO3−X (b-WO3−X) was prepared for the comparison purpose. An m-WO3−X electrode exhibited a high reversible capacity (748 mAh g−1, 6.5 Li/W) and a high volumetric capacity (∼1500 mAh cm−3), which is comparable to the Li metal itself (ca. 2000 mAh cm−3). Also, an improved rate capability and a good cyclability were observed in the m-WO3−X electrode when compared with m-WO3 and b-WO3−X electrodes. From electrochemical impedance spectroscopy (EIS) analysis, the advanced anode performance of the m-WO3−X electrode was probably attributed to large ordered mesopores and a high electrical conductivity. Differential scanning calorimetry (DSC) result displayed that the safety of m-WO3−X was more improved than those of graphite and Si anode materials.

Graphical abstract: Development of a high-performance anode for lithium ion batteries using novel ordered mesoporous tungsten oxide materials with high electrical conductivity