Journal
APPLIED SURFACE SCIENCE
Volume 552, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.149446
Keywords
Disproportionated SiOX; Controllable preparation; SiOX@C sheets; 3-dimensional network; High-performance anode materials
Categories
Funding
- Natural Science Foundation of Jiangsu Province [BK20181055]
- Natural Science Foundation of China [51805466]
- National Natural Science Foundation of China [61774084]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- special fund of Jiangsu province for the transformation of scientific and technological achievements [BA2019047]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX18_0273]
- China Postdoctoral Science Foundation [2019M651823]
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The controllable preparation of porous SiOX/C sheets with various oxygen content and graphite-like carbon as anode materials of LIB has been achieved, showing improved structural stability and performance.
Silicon suboxide (SiOX) is a promising anode material for lithium ion battery (LIB). However, oxygen-dependent SiOX poses a great impact on its cycling stability, which is difficult to controllably prepare. Additionally, the aggregation of nano-scale SiOX restricts the diffusion of lithium ion and structural stability during cycles. Herein, we realize the controllable preparation of porous SiOX/C sheets with various oxygen content and graphite-like carbon as anode materials of LIB. It is found that high oxygen content and a 3-dimensional network in SiOX/C can ensure high structural stability during cycles. As-prepared SiOX facilitates the growth of graphite-like carbon with high defect density, improving their electron and ion conductivity. As-prepared SiOX@C sheets deliver superior reversible capacity, cycling stability and rate performance (the second discharging capacity of 717.4 mAh g(-1) at 100 mA g(-1) with high initial Coulombic Efficiency of 64.08% is obtained; its capacity retention is as high as 100.44% against the second discharging capacity after 200 cycles; at a high current density of 2000 mA g(-1), its reversible capacity still remains 389 mAh g(-1)). This work provides a novel and simple approach to controllably prepare disproportionated SiOX@C sheets with the 3-dimensional network as ultrastable SiOx-based anode materials of LIB for practical application.
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