(Invited) Development of High-performance Si Anodes and O3-type Metal Oxide Cathodes for Next Generation Li-ion Batteries and Beyond

Abstract

Silicon is the most promising anode material for next generation high energy Li-ion batteries. While Na-ion battery is one of the closest beyond Li-ion technologies to commercial production and O3-type metal oxide cathodes are expected to deliver high performance in terms of specific capacity and energy density. In this talk, we will discuss the progress of our recent development on porous structured Si materials and localized high concentration electrolyte towards practical applications. For the development of O3-type layered cathode for Na-ion batteries, we will report the synthesis of O3-NaNi0.68Mn0.22Co0.10O2 cathode, which delivers a specific capacity of ~196 mAh/g and a specific energy of ~612 Wh/kg (based on the cathode). By controlling the surface phase transition and chemical reactivity with localized high concentration electrolyte, the Ni-rich NMC cathode demonstrated >83% capacity retention over 100 cycles between 2-4.2V (vs. Na/Na+). The cathode has a specific capacity of ~151 mAh/g between 2-4V and ~80% capacity retention over 1000 cycles. NaNi0.68Mn0.22Co0.10O2-hard carbon full-cells with practical loading (>2.5 mAh/cm2) and lean electrolyte (~40 µL) also were demonstrated. The capacity retention is ~82% after 450 cycles.