Lithium-ion batteries (LIBs) are being dominant power sources for smart phones, electric vehicles and energy storage systems because of higher energy density, lighter weight, smaller volume design and longer cycle than other batteries. However, LIBs operated at high or low temperatures suffer from severe loss of power and energy due to degradation of structure and surface of cathode and anode, with an impedance rise. In addition, lithium plating occurs at a high rate cycling. Nickel-rich layered oxides of Li(Ni_(1-x-y)Co_xMn_y)O_2 (NCM, 1-x-y ≥ 0.5) has been regarded as a promising cathode active material because of high specific capacity and good thermal stability but its performance is limited by the interfacial stability with commercial electrolyte. In this presentation, we report our recent development and application of designed electrolyte that provides highly stable nickel-rich cathode-electrolyte interface under high-voltages. The correlation between improved performance and interface chemistry would be discussed in the meeting.
展开▼
