Lithium−Cobalt Citrate Precursors in the Preparation of Intercalation Electrode Materials

• DOI: 10.1021/cm960009t
• Publication Date: 2002-07-26T05:30:15Z
• Authors: E. Zhecheva; R. Stoyanova; M. Gorova; R. Alcántara; J. Morales; J. L. Tirado
• Keywords: 02 engineering and technology; 0210 nano-technology; 01 natural sciences; 0104 chemical sciences

Noncrystalline solids with LiCoC6H5O7·5H2O and (NH4)3LiCo(C6H5O7)2 compositions were obtained by ethanol dehydration of concentrated lithium−cobalt citrate solutions. Electron spectroscopy solutions solid citrates, as well IR reveals that in one triionized ion chelates Co2+ while two ions surround (NH4)3LiCo(C6H5O7)2. Lithium−cobalt citrates used precursors the formation mixed oxides. At 400 °C, thermal decomposition yields a mixture pseudo-spinel rhombohedral LiCoO2. From (NH4)3LiCo(C6H5O7)2, monophase powders LiCoO2 at which consist hexagonal individual particles diameter 80−120 nm. This product can be annealed up to 800 °C without marked structural changes. The was active cathode material lithium cells. Cyclic voltammogams showed little changes main cathodic anodic peaks synthesis temperature. loss cell capacity is limited electrodes prepared from compared products low-temperature synthetic procedures previously reported.