| 초록 |
The high energy density of Li-ion batteries (LIB) make them attractive for energy storage in applications ranging from mobile products to electric vehicles (EV) and dedicated energy storage systems (ESS). However, slow progress in improvement limits the feasibly of widespread LIB. Among the various cell components, the capacity and activity of cathode materials, such as LiCoO2 and LiMnO2, are limiting factors to increase energy density. There are two candidate material for achieving this capacity. One is Li-rich layered-oxide cathode materials, referred to as over-lithiated layered oxides (OLO), in the solid solution system Li2MnO3-LiMO2 (where M is Co, Ni, or Mn). OLO have been produced with capacities exceeding 250 mAh/g at high operating voltages. The other is Ni-rich layered oxide cathode materials (Ni-rich NCM or NCA), such as LiNixCoyMn (or Al)1-x-yO2 (x ＞ 0.8) with high specific capacity and low manufacturing cost. |
