Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (6): 1121-1126.doi: 10.3866/PKU.WHXB201404221

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Synthesis and Modification of a Lamellar Co3O4 Anode for Lithium-Ion Batteries

HUANG Guo-Yong1, XU Sheng-Ming1,2, LI Lin-Yan1, WANG Xue-Jun1, LU Sha-Sha1   

  1. 1 Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, P. R. China;
    2 Beijing Key Laboratory of Fine Ceramics, Tsinghua University, Beijing 100084, P. R. China
  • Received:2014-01-16 Revised:2014-04-21 Published:2014-05-26
  • Contact: XU Sheng-Ming, LI Lin-Yan E-mail:smxu@tsinghua.edu.cn;lilinyan@mail.tsinghua.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51274130).

Abstract:

For advanced performance lithium-ion batteries (LIBs) various novel electrode materials with high energy density have been extensively investigated. Cobaltosic oxide (Co3O4), commonly used as an anode in LIBs, has attracted much interest because of its high theoretical specific capacity (890 mAh·g-1), high tap density, and stable chemical properties. However, its practical use has been hindered because of its low electronic conductivity and poor rate capability. To address these problems, we investigated a liquid phase precipitation method followed by thermal treatment and obtained a unique lamellar Co3O4 powder. Its X-ray diffraction (XRD) diffraction peaks match the standard pattern for cubic phase Co3O4 with good crystallinity. We found that the Co3O4 powder consists of many irregular sheets (1.5-3.0 μm in diameter, 100-300 nm in thickness) with numerous poles by scanning electronmicroscopy (SEM).Additionally, the surface area was about 30.5 m2·g-1, and this was calculated from BET nitrogen adsorption isotherm measurement data. Remarkably, perfect performance was obtained as evaluated by electrochemical measurements, including a high initial discharge capacity (1444.5 mAh·g-1 at 0.1C) and excellent capacity retention (charge capacity after 50 cycles was still greater than 1100.0 mAh·g-1 at 0.1C). However, its rate capability was still not adequate (75.3% of the first charge capacity after 50 cycles at 1C). To improve the rate capability, commercial carbon nanotubes (CNTs) mixed with the Co3O4 powder was used to enhance the electronic conductivity. The charge capacity retention ratios were 96.3% after 70 cycles at 1C and 97.0% after 50 cycles at 2C. Therefore, enhanced electrochemical performance with impressive rate capability was obtained, as expected.

Key words: Co3O4, Lamellar, Carbon nanotube, Lithium-ion battery, Anode

MSC2000: 

  • O646