Partic. vol. 8 no. 3 pp. 202-206 (June 2010)
doi: 10.1016/j.partic.2010.03.006

Synthesis of layered cathode materials Li[Co_xNi_yMn_1−x−y]O₂ from layered double hydroxide precursors

Yanluo Lu^*, Yang Zhao

luyl1@mail.buct.edu.cn

Abstract

Cathode materials Li[Co_xNi_yMn_1−x−y]O₂ for lithium secondary batteries have been prepared by a new route using layered double hydroxides (LDHs) as a precursor. The resulting layered phase with the α-NaFeO₂ structure crystallizes in the rhombohedral system, with space group R-3m having an interlayer spacing close to 0.47 nm. X-ray photoelectron spectroscopy (XPS) was used to measure the oxidation states of Co, Ni and Mn. The effects of varying the Co/Ni/Mn ratio on both the structure and electrochemical properties of Li[Co_xNi_yMn_1−x−y]O₂ have been investigated by X-ray diffraction and electrochemical tests. The products demonstrated a rather stable cycling behavior, with a reversible capacity of 118 mAh/g for the layered material with Co/Ni/Mn = 1/1/1.

Keywords

Layered Li[Co_xNi_yMn_1−x−y]O₂; Layered double hydroxides; Precursor method; Cathode materials