Binder-free flexible Li2ZnTi3O8@MWCNTs stereoscopic network as lightweight and superior rate performance anode for lithium-ion batteries

By An, Chenying; Li, Caihui; Tang, Haoqing; Liu, Tao; Tang, Zhiyuan
Published in Journal of Alloys and Compounds 2019

Abstract

High performance flexible electrodes with ultrathin and ultralight characteristics are great potential as power supply for foldable and wearable electronic devices. One major problem is how to combine active material with conductive substrate firmly in the absence of polymeric binder. Here, sandwich structure of flexible electrode is successfully prepared which Li2ZnTi3O8@multi-walled carbon nanotubes (MWCNTs) composite as intermediate anode active ingredient and three-dimensional network MWCNTs as top and bottom conductive layers. The MWCNTs in active material and conductive layers cross-link each other to form a firm and stable three-dimensional network, which provides stereoscopic electron and ion transmission channels without metal copper substrate. This particular structure of electrode is effectively reduce the total weight and improve flexibility. Typically, the flexible Li2ZnTi3O8@MWCNTs electrode shows good cycling stability and achieved a high reversible capacity of 95.2 mAh g?1 after 1000 cycles at current density of 7000 mA g?1 with 89.0% capacity retention and 99% Coulombic efficiency. This study offers a new strategy for the development of high conductivity flexible electrode for wearable devices and deformable electronic devices.

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