This technology introduces Co-MOF-74, featuring 0.4–0.9 nm pores, as an electrode additive for cathode compositions. It selectively captures unstable Ni, Mn, and Co ions remaining on the cathode surface during charge/discharge, suppressing metal leaching and enhancing electrode interface stability.
Ni-rich cathodes, such as NCM811, have historically suffered from transition metal leaching caused by the reaction between unstable surface Ni4+ species and the electrolyte. These leached metal ions migrate to the anode, disrupting SEI layer formation and accelerating cathode structural degradation, which reduces long-term cycle performance.
This technology involves adding Co-MOF-74, synthesized from 2,5-dihydroxyterephthalic acid and Co(NO3)2·6H2O, at 5 wt% of the total cathode composition. The microporous MOF selectively traps transition metals to inhibit leaching, improves capacity retention during high-temperature cycling, and prevents the formation of electrolyte decomposition products on the anode surface. Applicable to EV battery packs and high-nickel cathode cell designs requiring long-term high-temperature operation, it slows degradation at both the cathode and anode simply by adding the additive, without requiring changes to the active material composition.
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