Synthesis And Electrochemical Properties Of Li(ni_(0.8)co_(0.1)mn_(0.1))o_2 Cathode Material: Ex Situ Structural Analysis By Raman Scattering And X-ray Diffraction At Various Stages Of Charge-discharge Process

摘要

Li(Ni_(0.8)Co_(0.1)Mn_(0.1))O_2 cathode materials were synthesized by solid-state reaction route. Single-phase layer structure with hexagonal unit cell having R3m symmetry was obtained and the average particle size was around 6 μm. Electrochemical studies showed single redox reaction and a maximum charging capacity of ～140 mAh g~(-1) was obtained. Ex situ structural studies by X-ray diffraction and Raman scattering at various stages of charging and discharging showed that the host layered structure is maintained throughout the electrochemical lithiation-delithiation processes in the 3-4.5 V range with systematic change in the lattice parameters. First discharge capacity was 132 mAhg~(-1) and the capacity retention was ～86% after 20 charge-discharge cycles.