Journal
ENERGY STORAGE MATERIALS
Volume 36, Issue -, Pages 265-271Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2020.12.034
Keywords
Thick-electrode; Thickness-independent capacity; 2D porous nanosheets; Layered structure; Ion transport
Funding
- National Science Foundation of China [22075048]
- Shanghai International Collaboration research project [19520713900]
- State Key Laboratory of Molecular Engineering of Polymers
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A high-performance thick electrode was fabricated through layer-by-layer assembly of two-dimensional nanosheets, allowing for abundant ion-transport channels. The new electrode exhibits excellent capacity and areal capacity, marking a significant stride towards higher energy density.
Thick electrode is essential for new-generation, high energy density batteries due to its low active/inactive-component ratio. However, current strategies using external forces for improving ion-transport in electrodes often cause low volumetric density, poor mechanical property or less mass loading. Here, high-performance thick electrodes were fabricated through layer-by-layer assembly of two-dimensional (2D), porous nanosheets. The 2D morphology and in-plane pores enable dense electrode structure but with abundant, penetrated ion-transport channels. Various cathode species (NCMs, LCO and LNMC nanosheets) were synthesized by a simple one-pot process. Typically, the mechanically robust NS-NCM electrode reveals rate and cycling performance far better than the commercial NCM counterparts. In particular, the NS-NCM electrode exhibits thickness-independent capacity and excellent volumetric capacity even when the mass loading is scaled up to 320 mg cm(-2). This enables it to deliver a superb areal capacity of 45.4 mAh cm(-2), surpassing all the reported cathode species and one order of magnitude higher than commercial cathodes. This strategy provides a significant stride in structural design of electrode toward higher areal and volumetric energy density.
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