Abstract
The structural and electrochemical characteristics and the thermal behavior of four-cation oxides, LiNi 0.85Co 0.10M 0.05O 2 (M=Al, Fe) were examined by X-ray and neutron diffraction measurements, charge/discharge cycling and thermal analysis. LiNi 0.85Co 0.10Al 0.05O 2 showed enhanced electrochemical properties, i.e. a small polarization and a large reversible capacity during the charge/discharge cycling compared with LiNiO 2 and it is due to the structural stabilization of the nickelate in the wide range of x by Co and Al substitution. The substitution of Co, Al and Fe also had a beneficial effect on the thermal stability of LiNiO 2.
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