High-coulombic-efficiency Si-based hybrid microspheres synthesized by the combination of graphene and IL-derived carbon. Issue 42 (11th August 2015)

• Record Type: Journal Article
• Authors: Park, Sang-Hoon; Ahn, Dongjoon; Choi, Young-Min; Roh, Kwang Chul; Kim, Kwang-Bum
• Is Part Of: Journal of materials chemistry. Volume 3:Issue 42(2015)
• Page Start: 20935
• Page End: 20943
• Publication Date: 2015-08-11
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c5ta03861h
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The low initial coulombic efficiency of a Si-based anode can hinder the performance of practical full-cell Li-ion batteries (LIBs), as the irreversible capacity loss of the anode can diminish the reversible full-cell capacity and the energy efficiency. Abstract : The low initial coulombic efficiency of a Si-based anode can hinder the performance of practical full-cell Li-ion batteries (LIBs), as the irreversible capacity loss of the anode can diminish the reversible full-cell capacity and the energy efficiency. Therefore, it is critical to develop high-coulombic-efficiency Si-based anode materials from a practical perspective. To this end, we developed a high-coulombic-efficiency Si-based hybrid anode material with suitable cycling performance by developing a spray-assisted assembly process based on a combination of graphene and ionic liquid (IL). During the assembly process, the IL was trapped between the graphene and Si nanoparticles. Then, it was easily converted into IL-derived carbon, to generate additional protective/binding layers in the resultant Si-based hybrid microspheres. This IL-derived carbon layer played an important role in improving the electrochemical performance of the Si-based hybrid microspheres. The resultant Si-based hybrid microsphere electrode exhibited enhanced initial coulombic efficiency along with improved cycling performance, owing to the formation of the protective/binding carbon layers derived from the IL.