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Synthesis of hierarchical graphene coated porous Si anode for lithium-ion batteries

Journal Article · · Journal of Energy Storage
 [1];  [2];  [2];  [3];  [3];  [3];  [3]
  1. University of North Dakota, Grand Forks, ND (United States); University of North Dakota
  2. Canadian Light Source Inc., Saskatoon (Canada)
  3. University of North Dakota, Grand Forks, ND (United States)
The ultra-high capacity and widespread availability of Si materials have resulted in them being the focus of extensive studies to replace the graphite anode. However, the main barriers preventing the Si anodes from large-scale applications are their huge volume change and severe interface reactions in the lithiation/delithiation process, which pulverizes its structure and subsequently deteriorates its cycle life. Here, micrometer-scale porous Si coated with graphene coating (mpSi@G) has been synthesized by using SiO2 nanoparticles and novel coal-derived humic acid as feedstocks through a magnesiothermic reduction, followed by spray drying and calcination techniques. SEM, Raman, and X-ray absorption analysis demonstrate that the hierarchical graphene shell and micrometer-sized porous Si structure effectively release the Si anode's mechanical stress upon lithiation to achieve good structural stability. Here, the synthesized mpSi@G anode delivers a high initial lithiation capacity of 2974.9 mAh g–1 at 0.1 A g–1 with an initial coulombic efficiency of 70.2 %. Furthermore, the conductive hierarchical graphene network, along with the tight contacts of porous-Si and the graphene shell, contribute to a high capacity of 1109.5 mAh g–1 at a high current density of 5.0 A g–1, showing excellent rate capability.
Research Organization:
University of North Dakota, Grand Forks, ND (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Fossil Energy and Carbon Management (FECM), Office of Carbon Management
Grant/Contract Number:
FE0026825; FE0031984
OSTI ID:
2440733
Alternate ID(s):
OSTI ID: 2459341
Journal Information:
Journal of Energy Storage, Journal Name: Journal of Energy Storage Vol. 97; ISSN 2352-152X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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