High Voltage Cathode

Electrolyte Oxidation

Standard carbonate solvents reach their stability limit when paired with a high voltage cathode. Oxidation leads to gas evolution and the formation of a thick solid electrolyte interphase that consumes active lithium. Fluorinated additives are often used to create a more stable interface that can withstand the aggressive environment.

This modification prevents rapid capacity fading and internal pressure buildup.

Lattice Expansion

Structural strain occurs as lithium ions are removed from the crystal framework during high voltage charging. In a high voltage cathode, the volume change can lead to micro-cracking within the secondary particles. These cracks expose fresh surfaces to the electrolyte and accelerate degradation.

Thermal Response

Safety profiles are heavily influenced by the oxygen release temperature of the oxide structure. A high voltage cathode may release oxygen more readily than lower voltage alternatives during a thermal event. Doping with aluminum or magnesium improves the bonding strength within the oxygen lattice.