Graphene collage on Ni-rich layered oxide cathodes for advanced lithium-ion batteries

Chang Won Park, Jung-Hun Lee, Jae Kwon Seo, Won Young Jo, Dongmok Whang, Soo Min Hwang () and Young-Jun Kim ()
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Chang Won Park: Sungkyunkwan University
Jung-Hun Lee: Sungkyunkwan University
Jae Kwon Seo: Sungkyunkwan University
Won Young Jo: Sungkyunkwan University
Dongmok Whang: Sungkyunkwan University
Soo Min Hwang: Sungkyunkwan University
Young-Jun Kim: Sungkyunkwan University

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract The energy storage performance of lithium-ion batteries (LIBs) depends on the electrode capacity and electrode/cell design parameters, which have previously been addressed separately, leading to a failure in practical implementation. Here, we show how conformal graphene (Gr) coating on Ni-rich oxides enables the fabrication of highly packed cathodes containing a high content of active material (~99 wt%) without conventional conducting agents. With 99 wt% LiNi0.8Co0.15Al0.05O2 (NCA) and electrode density of ~4.3 g cm-3, the Gr-coated NCA cathode delivers a high areal capacity, ~5.4 mAh cm−2 (~38% increase) and high volumetric capacity, ~863 mAh cm-3 (~34% increase) at a current rate of 0.2 C (~1.1 mA cm-2); this surpasses the bare electrode approaching a commercial level of electrode setting (96 wt% NCA; ~3.3 g cm-3). Our findings offer a combinatorial avenue for materials engineering and electrode design toward advanced LIB cathodes.

Date: 2021
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DOI: 10.1038/s41467-021-22403-w

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