title: Defect-free, size-tunable graphene for high-performance lithium ion battery.
abstract: The scalable preparation of graphene in control of its structure would significantly improve its commercial viability. Despite intense research in this area, the size control of defect-free graphene (df-G) without any trace of oxidation or structural damage remains a key challenge. Here, we propose a new scalable route for generating df-G with a controllable size of submicron to micron through sequential insertion of potassium and pyridine at low temperature. Structural and chemical analyses confirm that the df-G perfectly preserves the intrinsic properties of graphene. The Co3O4 (<50 nm) wrapped by ∼ 10.5 μm(2) df-G has unprecedented capacity, rate capability, and cycling stability with capacities as high as 1050 mAh g(-1) at 500 mA g(-1) and 900 mAh g(-1) at 1000 mA g(-1) even after 200 cycles, which suggests enticing potential for the use in high performance lithium ion batteries.
authors.affiliation: Department of Chemical and Biomolecular Engineering and ‡Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 305-701, Republic of Korea.
authors.forename: Kwang Hyun
authors.initials: KH
authors.lastname: Park
authors.forename: Dongju
authors.initials: D
authors.lastname: Lee
authors.forename: Jungmo
authors.initials: J
authors.lastname: Kim
authors.forename: Jongchan
authors.initials: J
authors.lastname: Song
authors.forename: Yong Min
authors.initials: YM
authors.lastname: Lee
authors.forename: Hee-Tak
authors.initials: HT
authors.lastname: Kim
authors.forename: Jung-Ki
authors.initials: JK
authors.lastname: Park