A novel calendula-like MnNb2O6 anchored on graphene sheet as high-performance intercalation pseudocapacitive anode for lithium-ion capacitors. Issue 6 (23rd January 2019)

• Record Type: Journal Article
• Authors: Zhang, Xu; Zhang, Jinyu; Kong, Shuying; Zhu, Kai; Yan, Jun; Ye, Ke; Wang, Guiling; Cheng, Kui; Zhou, Limin; Cao, Dianxue
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 6(2019)
• Page Start: 2855
• Page End: 2863
• Publication Date: 2019-01-23
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8ta10233c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : In this paper, for the first time, we investigated MnNb2 O6 as a new rate capability type anode material for lithium-ion capacitors (LICs), which exhibit excellent charge storage capacity and reasonably superior cycling stability. Abstract : To balance the electrochemical performance gap between the Li + insertion/deintercalation anode and the anion adsorption/desorption cathode, in this paper, for the first time, we investigated MnNb2 O6 as a new rate capability type anode material for lithium-ion capacitors (LICs). Novel calendula-like MnNb2 O6 particles anchored on reduced graphene oxide (rGO) were prepared via a simple two-step hydrothermal route. The special three-dimensional structure and cross-linked conductive network constructed by graphene could shorten the lithium-ion diffusion path, efficiently facilitate electron transmission and adapt to volume strain without shedding during the long-term charge/discharge process. This resulted in excellent charge storage capacity and reasonably superior cycling stability. MnNb2 O6 @rGO//AC LICs assembled with MnNb2 O6 @rGO as the cathode and activated carbon (AC) as the anode exhibited excellent performance with maximum energy density of 118 W h kg −1 and power density of 8000 W kg −1 based on the total mass loading of the active material weight. The initial capacity retention was up to 88% after 10 000 charge/discharge cycles, which was higher than that of bimetallic oxide materials reported so far. Therefore, this study might provide a novel rate capability anode material for LICs with high performance.