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06-11-2023 | Original Article

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

Authors: Ben-Rui Hu, Ying-Yi Yuan, Yu-Cheng Wang, Xun-Hui Xiong

Published in: Rare Metals | Issue 1/2024

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Abstract

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_0.08Al_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 of 131.9 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.

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Title: Simultaneously enhanced electrochemical performance and air stability of Ni-rich cathode with a modified washing process
Authors: Ben-Rui Hu
Ying-Yi Yuan
Yu-Cheng Wang
Xun-Hui Xiong
Publication date: 06-11-2023
Publisher: Nonferrous Metals Society of China
Published in: Rare Metals / Issue 1/2024
Print ISSN: 1001-0521
Electronic ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-023-02388-9

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