Blended cathode materials for all-solid-state Li-ion batteries

Abstract

In this article, we report the effects of blended cathode materials in all solid-state lithium-ion batteries (ASLBs) with oxide-based inorganic-organic-hybrid electrolytes. A high capacity Ni-rich cathode material was used for high energy density in an ASLB, and LiFePO4, with its robust olivine structure, was added to compensate for the degradation of the Ni-rich cathode material during cycling. In case of the blended cathode, the shortcomings of the parent material can be minimized by blending two cathode materials, and the blending ratio can be tailored to produce stable high energy and power densities. For these reasons, the structure, cycling stability, and rate performance of the blended LiNi0.7Co0.15Mn0.15O2/LiFePO4 cathode material, for use in ASLBs with oxide-based inorganic–organic-hybrid electrolytes, was investigated by powder X-ray diffraction, field-emission scanning electron microscopy, Brunauer–Emmett–Teller sorption experiments, electrochemical impedance spectroscopy, and galvanostatic testing.