This technology involves coating or embedding a composite of aluminum oxide (Al2O3) and the radical scavenger tris(2,4,6-trimethylphenyl)phosphine (TMPP) onto the surface of a lithium secondary battery separator to chemically remove harmful radicals generated by electrolyte decomposition and enhance electrode interface stability.
Using high-energy-density electrodes like NCM811 often leads to the formation of unstable radical intermediates during electrolyte decomposition, which accelerate chain reactions within the battery and degrade cycling performance.
This technology is configured by synthesizing a composite through the condensation reaction of hydroxyl groups (-OH) on Al2O3 with TMPP, then applying it to a polyethylene (PE) separator surface via dip coating. The low-oxidation-state phosphorus (P) atoms scavenge radicals, while Al2O3 improves surface hydrophilicity, enhancing electrolyte wettability and ionic conductivity. It can be applied by separator manufacturers using existing PE coating lines or in power tool and EV batteries requiring longer life for high-nickel cathodes, effectively breaking the chain of side reactions at the separator level without altering electrolyte composition.
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