If high-voltage electrode materials are used to increase energy density, then the battery's energy storage capacity is improved, but the electrolyte decomposes more easily due to the narrow potential window

The patent introduces a coating layer comprising metal fluoride, metal oxide, or metal oxyfluoride as an intermediary between the high-voltage cathode material and the electrolyte. This coating layer acts as a mediator that prevents direct contact and harmful interactions, allowing the use of high-voltage electrode materials while maintaining electrolyte stability. The coating layer has specific properties (ionic conductivity, electronic conductivity control, and chemical stability) that enable it to bridge the gap between high-energy-density materials and stable electrolyte operation.

If the battery operates at high temperatures to improve performance, then the power output is enhanced, but the electrolyte decomposition accelerates reducing lifetime

The patent applies a protective coating layer on the cathode material surface before battery operation begins. This pre-applied coating serves as a cushioning barrier that prevents thermal runaway and electrolyte decomposition even when the battery operates at high temperatures. The coating layer is specifically designed to remain stable under thermal stress and prevent harmful reactions between the electrolyte and electrode materials at elevated temperatures, thereby extending battery lifetime while maintaining high-power capability.