Journal
ACS APPLIED ENERGY MATERIALS
Volume 3, Issue 5, Pages 4394-4402Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c00090
Keywords
lithium-ion batteries; silicon oxides; defect-enriched graphite flake; ions and electrons transportation; 3D electronic and flexible framework
Funding
- National Natural Science Foundation of China [U1802256, 51672128, 21773118, 21875107, 51802154]
- Key Research and Development Program in Jiangsu province [BE2018122]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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The two-dimensional (2D) defect-enriched nanomaterials have aroused great interests, owing to its special electronic properties and the fast transport of lithium ions. Herein, we present a facile and mature method to cage SiOx nanoparticles into the defect-enriched graphite flake through ball-milling for 4 h (GF-4), assisted by solid diluent 4-aminophenol (4-AP). 4-AP prevents reaggregation of the graphite flakes and excessive formation of defect carbon during the milling process. Moreover, it further consolidates the layered sandwiching structure and introduces nitrogen element into the SiOx/C/GF-4 composite after carbonization. Thus, the N-SiOx/C/GF-4 composite not merely retains a 3D electronic and flexible framework to guarantee the excellent structural compatibility but optimizes simultaneously the transport and the high diffusion rate of lithium ions in the electrodes. It displays an excellent cycle performance of 525.2 mAh g(-1) over 500 cycles (1 A g(-1)) and a superior rate performance of 334 mAh g(-1) (5 A g(-1)). Furthermore, the full cell based on N-SiOx/C/GF-4 and commercial NCM622 cathode demonstrates a commendable gravimetric energy density of 413.2 Wh kg(-1).
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