A synergistic “cascade” effect in copper zinc tin sulfide nanowalls for highly stable and efficient lithium ion storage
Journal
Nano Energy
Journal Volume
44
Pages
438-446
Date Issued
2018
Author(s)
Chiu, J.-M.
Chou, T.-C.
Wong, D.P.
Lin, Y.-R.
Shen, C.-A.
Hy, S.
Hwang, B.-J.
Tai, Y.
Abstract
Applications of lithium ion battery have been hampered by a lack of ideal anode materials in terms of capacity and stability. The emergence of metal chalcogenide as a candidate material has reinvigorated the search of a low cost and high capacity material system. However, debate about the underlying mechanisms and overall appraisal of its usage in lithium ion battery system remains. Here, a comprehensive study on the energy storage mechanism of copper zinc tin sulfide (CZTS) nanowalls possessing ultrahigh rate capability (500 mAh g−1 charged within 60 s) is reported. Structural evolutions along with the accompanying changes in the oxidation state upon charge/discharge were monitored by ex-situ X-ray diffraction and X-ray photoelectron spectroscopy. During lithiation, lithium ion reacted with CZTS to form lithium sulfides. At the same time, a sequential conversion reactions of copper, zinc and tin sulfides enabled the CZTS nanowalls to achieve excellent electrochemical performance (1400 mAh g−1 at a current density of 1000 mA g−1 over 400 cycles). Multi-element metal chalcogenides in conjunction with an adhesion-enhancing seed layer and a rational nanostructure design hold the key to such ultrahigh capacity and stable anode materials for next generation energy storage devices. © 2017 Elsevier Ltd
SDGs
Other Subjects
Anodes; Chalcogenides; Copper; Electric batteries; Electrodes; Energy storage; Inorganic compounds; Ions; Lithium; Nanostructures; Secondary batteries; Storage (materials); Sulfur compounds; Tin; X ray diffraction; X ray photoelectron spectroscopy; Zinc; Zinc sulfide; Cascade effects; Conversion reactions; Copper zinc tin sulfides; Electrochemical performance; High rate capability; High-capacity materials; Lithium ion storages; Structural evolution; Lithium-ion batteries
Publisher
Elsevier Ltd
Type
journal article