Journal
SOLID STATE IONICS
Volume 370, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2021.115734
Keywords
Lithium-ion batteries; Cathode; Cathode-electrolyte interphases; Aluminum phosphate; Electrochemical performance
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Funding
- National Research Foundation of Korea (NRF) [NRF-2017R1A6A1A06015181]
- Incheon National University
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Dually-functionalized Ni-rich NCM cathode materials are developed using aluminum phosphate for surface modification, which effectively suppress undesired reactions and improve cycling retention.
To improve high temperature cycling performance of Ni-rich NCM cathode materials, dually-functionalized Nirich NCM cathode materials are developed. In detail, aluminum phosphate (AP), composed of Al and PO4 functional groups, is used for surface modification of Ni-rich NCM cathode materials, which can be accomplished by one-step thermal treatment process. Our surface characterization analyses indicate that Al and PO4-functionalized cathode-electrolyte interphases (CEI) layers are well developed on the surface of Ni-rich NCM cathode materials which can effectively suppress undesired reactions such as electrolyte decomposition and dissolution of transition metal components. In cycling performances, AP-modified Ni-rich NCM cathode materials exhibit markedly improved cycling retention at high temperature even after 150 cycles. Among these, the cell cycled with 0.5-AP NCM811 cathode material presents the highest retention while the cell cycled with non-modified NCM811 cathode material suffers from poor cycling retention.
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