The oxidation stability of new energy battery materials directly determines the cycle life and safety of the battery. In the electrolyte of lithium-ion batteries, the introduction of fluorinated aromatic antioxidants has increased the cycle life of high-voltage positive electrode materials (such as NCM811) by more than 40%. Its unique electron absorption ability effectively suppresses the oxidation and decomposition of the electrolyte at high voltage. The stability of the solid electrolyte interface facial mask (SEI film) also benefits from the new antioxidant. The organic-inorganic hybrid nano anti oxygen particles form a uniform protective layer on the electrode surface, making the capacity retention rate of the silicon based anode still reach 85% after 500 cycles.
In the more cutting-edge field of lithium sulfur batteries, the shuttle effect of polysulfides leads to severe capacity degradation. Researchers have developed a microporous polymer antioxidant with free radical capture function, which constructs a selective barrier on the positive electrode side to allow lithium ions to pass through and block polysulfides, while removing reactive oxygen species generated during the oxidation process. This dual function design has made breakthrough progress in the cycling stability of lithium sulfur batteries, reducing the energy density decay rate to below 0.05% per cycle.
The demand for anti free radical corrosion of proton exchange membranes in hydrogen fuel cells has given rise to a new antioxidant system. Nano antioxidants based on cerium ions are uniformly dispersed in Nafion membranes and continuously eliminate hydroxyl radicals generated during operation through reversible Ce ³ ⁺/Ce ⁴⁺ redox cycles. Test data shows that this protection mechanism extends the service life of proton exchange membranes from 3000 hours to 15000 hours under harsh operating conditions, significantly reducing the maintenance cost of fuel cell systems.
