Methanol Oxidation on Carbon-Supported Pt-Os Bimetallic Nanoparticle Electrocatalysts

Authors:
  • JHJunjie Huang
    Junjie Huang
  • HYHui Yang
    Hui Yang
  • QHQinghong Huang
    Qinghong Huang
  • YTYawen Tang
    Yawen Tang
  • TLTianhong Lu
    Tianhong Lu
  • DADaniel L. Akins
    Daniel L. Akins
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Abstract
Li[NixCo1−2xMnx]O2Li[NixCo1−2xMnx]O2 electrode materials prepared at 900°C show good performance and are less reactive with electrolyte at elevated temperatures than LiCoO2LiCoO2 when charged to 4.2 V (vs. Li) and above. However, the tap density and the resulting electrode density of samples reported previously are lower than required for some industrial applications in Li-ion batteries. One way to increase the density while preserving a 900°C heating temperature is to use a sintering agent. A few weight percent of B2O3B2O3 was added during the synthesis of Li[NixCo1−2xMnx]O2Li[NixCo1−2xMnx]O2 as a sintering agent. The preparation, structure, morphology, density, and electrochemical behavior of the resulting materials, for several compositions, including x=0x=0 (i.e., LiCoO2),LiCoO2), are presented as a function of B2O3B2O3 content. We found that denser Li[NixCo1−2xMnx]O2Li[NixCo1−2xMnx]O2 (x>0)(x>0) could be obtained using B2O3B2O3 as a sintering agent. The presence of a lithium borate impurity in LiCoO2LiCoO2 samples and an increase in the amount of Ni in the Li layer for Li[NixCo1−2xMnx]O2Li[NixCo1−2xMnx]O2 with x>0x>0 are induced by B2O3B2O3 additions. For x=0.1,x=0.1, and for up to 1 wt % added B2O3,B2O3, the electrochemical behavior remains quite good while the sintering significantly improves the density of the powder. © 2004 The Electrochemical Society. All rights reserved.

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