Abstract
Nanomaterials exhibiting high conductivity have attracted immense interest for their promising applications in stabilizing electrodes for Li-ion batteries. Despite this, challenges in their dispersion and effective integration with active materials remain unresolved. In this study, we introduce an innovative strategy to augment Si-based anode materials, employing minimally defective graphene oxide (C-GO) and significantly oxidized single-walled carbon nanotubes (C-SWCNTs), synthesized via a chlorate-based oxidation process. Our technique encapsulates Si alloy (SiA) particles with C-GO and C-SWCNTs, circumventing the necessity for supplementary additives. We engineer composite structures featuring lithiophilic N-doped SWCNTs and a highly crystalline, reduced C-GO coating on SiA surfaces through spray drying, followed by chemical reduction. This synergistic integration results in impressive capacities, consistent retention performance, and exceptional initial capacities (1224 mAh g-1), alongside superior retention rates (82.3% after 100 cycles at 0.1 C). When applied in a LIB full-cell with a SiA/NC anode, the system delivers a high energy density of 350 Wh kg-1, while preserving 65% of its capacity after 200 cycles. Our results underscore the efficacy of this hybrid methodology, obviating the need for additional conducting additives and maintaining a minimal binder content (5 wt%). This research puts forth a viable solution to enhance Si-based anode materials in lithium-ion batteries, successfully addressing the persistent issues of nanomaterial dispersion and hybridization in electrode design. Acknowledgment This research was supported by the Primary Research Program (24A01016) of the Korea Electrotechnology Research Institute, and the National Research Council of Science & Technology (NST) grant by the Korea government (MSIT) (No. CAP21041-000). Figure 1
Published Version
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