Microscale Core-Shell Strctured Li[(Ni_(0.8)Co_(0.1)Mn_(0.1))_(0.8)(Ni_(0.5)Mn_(0.5))_(0.2)]O_2 as Positive Electrode Material for Lithium Batteries

摘要

A new concept of synergetic effects was developed with the synthesis of a spherical core-shell structure to effect a higher capacity from the LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 core and improved thermal stability from the Li[Ni_(0.5)Mn_(0.5)]O_2 shell. We now report the microscale spherical core-shell structure with LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 as the core and a Li[Ni_(0.5)Mn_(0.5)]O_2 as the shell. With these core-shell particles, a high capacity was delivered from the LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 core and a high thermal stability was achieved by the Li[Ni_(0.5)Mn_(0.5)]O_2 shell. The core-shell structured Li[(Ni_(0.8)Co_(0.1)Mn_(0.1))_(0.8)(Ni_(0.5)Mn_(0.5))_(0.2)]O_2-carbon cell showed superior cyclability and thermal stability relative to the Li[Ni_(0.8)Co_(0.1)Mn_(0.1)]O_2 alone at a 1 C rate for 600 cycles. As a new positive electrode material, the core-shell structure of Li[(Ni_(0.8)Co_(0.1)Mn_(0.1))_(0.8)(Ni_(0.5)Mn_(0.5))_(0.2)]O_2 provides a significant breakthrough for the development of lithium batteries with high capacity, excellent cyclability, and high thermal stability.