A diffusion encouraged core–shell heterostructured Co3Sn2@SnO2 anode towards emerging dual ion batteries with high energy density. Issue 26 (25th June 2021)

• Record Type: Journal Article
• Authors: Salunkhe, Tejaswi Tanaji; Kadam, Abhijit Nanaso; Kidanu, Weldejewergis Gebrewahid; Lee, Sang-Wha; Nguyen, Tuan Loi; Kim, Il Tae
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 26(2021)
• Page Start: 14991
• Page End: 15002
• Publication Date: 2021-06-25
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1ta03496k
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A novel core–shell heterostructured Co3 Sn2 @SnO2 anode is explored for lithium dual ion batteries (LDIBs). The optimized Co3 Sn2 @SnO2 anode and expanded graphite cathode in an LDIB delivered notable energy density (334.5 W h kg −1 ). Abstract : Lithium dual-ion batteries (LDIBs) are currently receiving great attention as energy-storage systems due to their low cost, environmentally friendly characteristics, and good safety features. Herein, mesoporous Co3 Sn2 and SnO2 core–shell heterostructures (Co3 Sn2 @SnO2 CSHs) were developed as new anode materials for LDIBs using diffusion-based nanocrystal conversion chemistry. LDIBs were configured using the 1 M LiPF6 electrolyte, Co3 Sn2 @SnO2 CSH anode, and expanded graphite (obtained by a simple ball milling process; so-called EG) cathode. After 200 cycles, the Co3 Sn2 @SnO2 -EG LDIB delivered a reversible capacity of 90.0 mA h g −1 at 300 mA g −1, a high coulombic efficiency of 93.3%, and an outstanding energy density of 334.5 W h kg −1 . These values demonstrate the feasibility of using LDIBs in various energy-related applications. Mechanisms are proposed to explain the intercalation/deintercalation of PF6 − and Li + ions at different charge–discharge voltages and these are validated by Raman spectroscopy, X-ray diffraction, and elemental mapping. Finally, the superior electrochemical performance of the fabricated LDIBs could be attributed to the following reasons: (i) the large number of inner voids and mesopores in the CSHs improved reaction kinetics and structural stability. (ii) The hybrid composites exhibited a significantly high conductivity. (iii) Inactive Co effectively buffered against electrode pulverization and aggregation, thus enhancing the structural integrity of Co3 Sn2 @SnO2 CSHs during the charge–discharge process. It is expected that these results will provide a new direction for the exploration of Co3 Sn2 @SnO2 CSHs and probably other transition metal-based composites in LDIB development for scalable energy storage.