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Lithium-rich oxides with different compositions are synthesized by coprecipitation method and tested as cathode materials for lithium-ion batteries (LIBs). The paper presents research into the degradation processes: capacity and voltage fade during cycling life. The lithium mobility is known to make one of the major contributions to LIBs lifetime. Therefore, galvanostatic intermittent titration (GITT) is provided to estimate lithium-ion diffusion coefficients (DLi+). We also calculate ohmic and polarization resistance values. There is shown the influence of the structural transformation of lithium-rich oxides on their kinetic parameters. We make an assumption about the optimal composition of such cathode materials for good electrochemical properties.

INVESTIGATION OF CAPACITY FADE AND VOLTAGE DECAY IN Li-RICH CATHODE MATERIALS WITH DIFFERENT PHASE COMPOSITION