McNulty, D, Geaney, H, Ramasse, Q orcid.org/0000-0001-7466-2283 et al. (1 more author) (2020) Long Cycle Life, Highly Ordered SnO₂/GeO₂ Nanocomposite Inverse Opal Anode Materials for Li‐Ion Batteries. Advanced Functional Materials, 30 (51). 2005073. ISSN 1616-301X
Abstract
Nanocomposite SnO2/GeO2 inverse opals (IOs) provide long cycle life with excellent capacity retention when tested as anode materials for Li‐ion batteries. It is demonstrated that the electrochemical performance of SnO2 is significantly improved via the engineering of a nanocomposite of nanoparticles of tetragonal SnO2 and hexagonal GeO2 into a highly ordered, porous inverse opal architecture. By introducing a GeO2 component, the SnO2/GeO2 IOs demonstrate stepwise lithium storage processes to improve cycling stability by mitigating capacity fade from material volume variations in a material that already improves cycling repose by its architecture. This results in higher capacity and better capacity retention. SnO2/GeO2 IOs achieve a reversible capacity of ≈880 and 690 mAh g−1 after the 50th and 250th cycles, respectively, at a specific current of 150 mA g−1. SnO2/GeO2 IOs are capable of delivering high specific capacities (average value of ≈570 mAh g−1) with stable capacity retention over 750 cycles at a specific current of 450 mA g−1. Tailoring the composition of nanocomposite metal‐oxide anodes to exploit the combination of conversion and alloying mechanisms enables stable binder‐free Li‐ion anodes. Nanoscaling the walls of the ordered macroporous structure provides efficient reversible redox lithiation mechanisms involving the oxides of Sn and Ge, which are simpler to prepare.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Keywords: | anode; GeO2; inverse opals; Li‐ions; nanocomposites; nanomaterials; SnO2 |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 11 Dec 2020 13:31 |
Last Modified: | 29 Jun 2021 15:17 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1002/adfm.202005073 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:168830 |