Electrochemical Properties of Low Temperature Crystallized LiCoO2

Electrochemical properties of low temperature (LT) crystallized are investigated. LT was obtained by a precipitation process in aqueous solution and a final heat‐treatment at 400°C in air. Potentiometric, voltammetric, and ac impedance experiments are performed as well as x‐ray diffraction measurements on electrochemically delithiated compounds. LT shows electrochemical and structural properties quite different from that exhibited by the high temperature (HT) . The main differences appear in terms of practical voltage, reversibility, Li transport in oxide, and structural changes as Li is deintercalated. This work clearly proves the 3D character of LT (spinel‐like structure). In spite of a lower working potential and a satisfactory capacity (Δ x = 0.5), the LT is highly reactive toward the electrolyte and is characterized by a slower Li transport than in layered HT .