Essay on Battery

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Journal of Alloys and Compounds 521 (2012) 83–89

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Nanostructured hybrid cobalt oxide/copper electrodes of lithium-ion batteries with reversible high-rate capabilities
Yue Qi, Ning Du ∗ , Hui Zhang, Jiazheng Wang, Yang Yang, Deren Yang
State Key Lab of Silicon Materials and Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China

a r t i c l e

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Article history:
Received 29 October 2011
Received in revised form 5 January 2012
Accepted 7 January 2012
Available online 16 January 2012
Keywords:
Cobalt oxide
Cu nanorod
…show more content…
Among them, cobalt oxides
(Co3 O4 , CoO) demonstrated the better electrochemical properties in lithium-ion batteries, than nickel oxide and iron oxides [4–6].
The reversible electrochemical reaction mechanism of the cobalt oxide was demonstrated as the formation and decomposition of
Li2 O, accompanying the reduction and oxidation of Co nanoparticles (in the range of 1–5 nm), which is different from the classical Li insertion/deinsertion or Li-alloying processes [3]. However, cobalt oxide suffers from poor capacity retention due to the low electrical conductivity and large volume swings during the charge/discharge cycling [7–9]. Despite the improvements on the specific capacity and cyclability by using cobalt oxides nanomaterials [10–12], there

∗ Corresponding author. Tel.: +86 571 87953190; fax: +86 571 87952322.
E-mail address: dna1122@zju.edu.cn (N. Du).
0925-8388/$ – see front matter © 2012 Elsevier B.V. All rights reserved. doi:10.1016/j.jallcom.2012.01.046 are still great challenges in the preparation of nano-architectured
CoOx electrodes with high surface area, small crystal size and designed shapes.
Hybridizing nanostructured cobalt oxides with conducting matrices to form complex structures has been realized to be an effective route to overcome the above-mentioned problems
[13–17]. More recently, Taberna et al. [18] demonstrated a two-step designed electrode consisting of Cu nanorods grown on a current collector followed by

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