Highly active cathode material LiCoO_2 for lithium ion battery through β-Co(OH)_2 as precursors

Structure and the electrochemical properties of LiCoO 2 were studied. Highly active layered LiCoO 2 powders, as the cathode materials for lithium ion battery, were synthesized through the layered β Co(OH) 2 as precursors, which were prepared by the controlled crystallization method. DTA/TGA (“differential thermal analysis” and “thermagravimetric analysis”) were employed to investigate the reaction mechanism. XRD (X ray diffraction) results show that the prepared LiCoO 2 is HT LiCoO 2 with α NaFeO 2 layer structure type. SEM photographs show that β Co(OH) 2 are the excellent precursors for LiCoO 2. Electrochemical test of constant current charge discharge proves that the LiCoO 2 powders prepared have excellent electrochemical property in laboratory coin cell: its initial charge capacity is 150.1 mAh/g, its initial discharge capacity is 143.8mAh/g and the coulomb efficiency is 95.8%.