Chemical welding of diamine molecules in graphene oxide nanosheets: Design of precisely controlled interlayer spacings with the fast Li+ diffusion coefficient toward high-performance storage application. (1st June 2021)

• Record Type: Journal Article
• Authors: Zhang, Bin-Mei; Zhang, Yu-Shan; Liu, Mao-Cheng; Li, Jun; Lu, Chun; Gu, Bingni; Liu, Ming-Jin; Hu, Yu-Xia; Zhao, Kun; Liu, Wen-Wu; Niu, Wen-Jun; Kong, Ling-Bin; Chueh, Yu-Lun
• Is Part Of: Electrochimica acta. Volume 380(2021)
• Publication Date: 2021-06-01
• Subjects: Graphene oxide nanosheets -- Expanded interlayer spacing -- Ions diffusion coefficient -- Rate capability -- Lithium ions storage; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2021.138114
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: A facile method of chemical welding was proposed to construct the diamine molecules (xDM, x = 2, 3, 4, 6 and 8) pillared- and strained-graphene oxides (GO) with controllable interlayer spacing via the dehydration condensation reaction between GO and xDM. The interlayer spacing of xDM pillared- and strained-GO (GO-xDM) is controllably enlarged by choosing the length of xDM, which determines the pillaring effects. The GO-xDM exhibits a low diffusion barrier and ultrafast Li + diffusion dynamics due to its enlarged interlayer spacing, which leads the excellent Li + storage rate capability. The effects of interlayer spacing on Li + diffusion dynamics are clarified that GO-2DM with the interlayer spacing of 0.911 nm displays the excellent Li + storage performance and fast Li + diffusion dynamics (DLi+ =2.4 × 10 −7 cm 2 s −1 ). The GO-2DM presents a high capacity of 291.8 mAh g −1 at a current density of 0.1 A g −1 and a high-rate capability of 120.8 mAh g −1 at a current density of 5.0 A g −1 . The GO-2DM//AC lithium-ion hybrid capacitor delivers a high energy density of 103.6 Wh kg −1 at a power density of 55.8 W kg −1, even reaches 2777.8 W kg −1 at a power density of 61.1 Wh kg −1 . The approach of chemical welding provides a novel perspective for controllably enlarging interlayer spacing and designing two-dimensional (2D) energy storage materials with high-rate capability. Graphical abstract: A novel approach that chemical welding diamine molecules (DM) between graphene oxide (GO) nanosheets via a simple dehydration condensation recation can controllably tune interlayer spacing and achieve fast Li + insertion/extraction. Image, graphical abstract