Recently,
Ni-rich layered cathode materials have become the most
common material used for lithium-ion batteries. From a structural
viewpoint, it is crucial to stabilize the surface structures of such
materials, as they are prone to undesirable side reactions and particle
cracking in which intergranular microcracks form at the particle surfaces
and then propagate inside. As a simplified engineering technique for
obtaining Ni-rich cathode materials with high reversibility and long-term
cycling stability, we propose a facile surface coating of piezoelectric
LiTaO3 onto a Ni-rich cathode material to enhance the charge
transfer reaction and surface structural integrity. Based on theoretical
and experimental investigation, we demonstrate that this surface protection
approach is effective at enhancing the reversibility and mechanical
strength of Ni-rich cathode materials, leading to a stable cycle performance
at up to 150 cycles, even at 60 °C. Furthermore, the piezoelectric
characteristics of the surface LiTaO3 can enhance the rate
capability of Ni-rich cathode materials at current densities of up
to 2.0C. The results of this study provide a practical insight on
the development of Ni-rich cathode materials for practical use in
electric vehicle applications.
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