首页|Unlocking fast Li-ion transport in micrometer-sized Mn-based cation-disordered rocksalt cathodes
Unlocking fast Li-ion transport in micrometer-sized Mn-based cation-disordered rocksalt cathodes
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The development of cation-disordered rocksalt(DRX)cathodes has garnered worldwide attention due to their high capacity,broad chemical space and excellent structural flexibility.However,their low intrinsic Li-ion conductivity necessitates extensive particle pulverization,typically achieved through ball-milling process,which impedes large-scale production.In this work,we present a proton-exchange assisted strategy to activate the Li-ion transport in Mn-based DRX cathodes.Short-range spinel-like ordering is observed to form within the DRX matrix after the post treatment,which significantly enhances the intrin-sic Li ion mobility.Notably,more than 280 mAh g-1 discharge capacity can be delivered at a slow rate from micrometer-sized particles with an overall disordered cation arrangement,which retains more than 150 mAh g-1 when cycled at a very high rate of 2000 mA g-1.Furthermore,we also demonstrate that the electrochemical performance of the post-treated cathodes can be further optimized by fine-tuning the reaction parameters.
Cation-disordered rocksalt cathodesPartially-disordered spinelProton-exchangeShort-range order
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