Abstract
Li(Ni0.8Mn0.1Co0.1)O2 (NMC811) cathode material for Li-ion battery has been considered as a next-generation of the lithium-ion battery, used for advanced applications such as electric vehicles. Although it has a high specific capacity, the major drawbacks of this material result in the obstacle of commercialization. In this work, the composite materials of reduced graphene oxide (rGO), carbon black (CB), and titanium dioxide (TiO2) nanoparticles were coated on the surface of the NMC811 particle by mechano-fusion technique, forming the core@shell structure to protect the morphological instability, as well as the electrolyte decomposition. Also, the shell elevates the Li-ion diffusion and ionic conductivity. Moreover, we firstly reported the fined-tune step formation protocol of cylindrical cell type lithium-ion battery (18650). As a result, the core@shell cathode with the step formation of 3.0-4.0V CC-charge/CCCV-discharge condition can deliver the capacity retention over 90% after 400 cycles at 1C (3.0-4.2V).
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