Simultaneously enhanced electrochemical performance and air stability of Ni-rich cathode with a modified washing process AITranslate

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Chinese Library Classification Number:TM912[电气工程—电力电子与电力传动]

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Water washing has been regarded as one of the most effective strategies to remove surface residual lithium of nickel-rich layered oxides for lithium-ion batteries(LIBs).However,the loss of lattice lithium during the water washing process deteriorates the electrochemical performances and air stability.Herein,washing the LiNi_0.90Co_0.05Al_0.02O₂(NCA) with ammonium dihydrogen phosphate(NH₄H₂PO₄) solution has been proposed to simultaneously enhance electrochemical performances and air stability,in which in-situ generated Li₃PO₄ coating layer on surface of NCA can suppress the loss of lattice lithium.Besides,as a fast ionic conductor,Li₃PO₄ coating layer on NCA can prevent the direct contact with electrolyte/air.As a result,the NH₄H₂PO₄ solution washed NCA cathode can deliver a high capacity of131.9 mAh·g^-1 at 10.0C rate as well as impressive cycle stability with a capacity retention of 83.1% after 100 cycles at 1.0C,much higher than those of water washed NCA(WS-NCA) electrode.After exposed in air for 7 days,the NH₄H₂PO₄ solution washed NCA electrode can more effectively maintain the structural integrity as well as the electrochemical performances than water-washed NCA.This work provides a simple and effective approach to enhance the cycle stability and air stability of Nickel-rich cathode materials.