期刊
NANO LETTERS
卷 23, 期 14, 页码 6681-6688出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.3c01890
关键词
P2-type cathode; Na-ion full cell; hard carbonanode; presodiation; active Na
A presodiation strategy is proposed to compensate for the initial Na loss in Na-ion full cells, resulting in a higher specific capacity and a higher energy density. The presodiation effect can be achieved through other engineering approaches, suggesting the scalability of this methodology.
The initial Na loss limits the theoretical specific capacityofcathodes in Na-ion full cell applications, especially for Na-deficientP2-type cathodes. In this study, we propose a presodiation strategyfor cathodes to compensate for the initial Na loss in Na-ion fullcells, resulting in a higher specific capacity and a higher energydensity. By employing an electrochemical presodiation approach, weinject 0.32 excess active Na into P2-type Na0.67Li0.1Fe0.37Mn0.53O2 (NLFMO),aiming to compensate for the initial Na loss in hard carbon (HC) andthe inherent Na deficiency of NLFMO. The structure of the NLFMO cathodeconverts from P2 to P & PRIME;2 upon active Na injection, without affectingsubsequent cycles. As a result, the HC||NLFMOpreNa fullcell exhibits a specific capacity of 125 mAh/g, surpassing the valueof 61 mAh/g of the HC||NLFMO full cell without presodiation due tothe injected active Na. Moreover, the presodiation effect can be achievedthrough other engineering approaches (e.g., Na-metal contact), suggestingthe scalability of this methodology.
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