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In Situ Fabrication of Hierarchical Porous CoO/Cu 2 O Composites on Cu Foam as High‐Performance Freestanding Anodes for Lithium–Ion Batteries
Author(s) -
Zhou Tingting,
Cao Zhen,
Ma Houyi,
Liu Xizheng
Publication year - 2017
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201700096
Subject(s) - materials science , dielectric spectroscopy , electrochemistry , anode , lithium (medication) , composite number , bimetallic strip , chemical engineering , electrolyte , cyclic voltammetry , fabrication , porosity , composite material , electrode , metallurgy , chemistry , metal , medicine , alternative medicine , engineering , pathology , endocrinology
A hierarchical porous CoO/Cu 2 O nanoarray assembled on three‐dimensional Cu foam was successfully fabricated by a facile solution‐phase cation exchange technique. The morphology and crystalline structure of the target composite were optimized by investigating the sintering conditions. The unique bimetallic oxides demonstrate a secondary porous structure on primary nanoarrays, which facilitated the electrolyte permeation and decreased the ionic transport distance. Owing to the conductive Cu framework and synergistic biactive components, the as‐prepared composite displayed superior electrochemical performance with high capacity and rate capability. Moreover, it showed stable cycling performance and a capacity of 832 mAh g −1 even after 50 discharge/charge cycles. The ionic transfer kinetics were investigated by cyclic voltammetry and electrochemical impedance spectroscopy. The cycled electrodes were also carefully examined to explain the origin of the enhanced performance. With a superb electrochemical performance and facile fabrication route, the freestanding CoO/Cu 2 O composites have a promising future as next‐generation anodes for lithium–ion batteries.