Journal
ELECTROCHIMICA ACTA
Volume 304, Issue -, Pages 246-254Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.02.098
Keywords
Colloidal bimetallic nanoparticles; Nickel tin alloy; Anode materials; Lithium-ion batteries; Sodium-ion batteries
Categories
Funding
- European Regional Development Funds
- Spanish Ministerio de Economia y Competitividad through the project SEHTOP [ENE2016-77798-C4-3-R]
- China Scholarship Council
- National Natural Science Foundation of China [51771076]
- 1000 plan from Chinese Government
- Project of Public Interest Research and Capacity Building of Guangdong Province [2017A010104004]
- Generalitat de Catalunya [2017 SGR 327]
- Spanish MINECO [ENE2017-85087-C3]
- Severo Ochoa Programme (MINECO) [SEV-2013-0295]
- CERCA Programme / Generalitat de Catalunya
- CSC-UAB PhD scholarship program
- MINECO/FEDER [ENE2015-63969-R, GC 2017 SGR 128]
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Nickel tin alloy nanoparticles (NPs) with tuned composition NixSn (0.6 <= x <= 1.9) were synthesized by a solution-based procedure and used as anode materials for Li-ion batteries (LIBs) and Na-ion batteries (SIBs). Among the compositions tested, Ni0.9Sn-based electrodes exhibited the best performance in both LIBs and SIBs. As LIB anodes, Ni0.9Sn-based electrodes delivered charge-discharge capacities of 980 mAh g(-1) after 340 cycles at 0.2 A g(-1) rate, which surpassed their maximum theoretical capacity considering that only Sn is lithiated. A kinetic characterization of the charge-discharge process demonstrated the electrode performance to be aided by a significant pseudocapacitive contribution that compensated for the loss of energy storage capacity associated to the solid-electrolyte interphase formation. This significant pseudocapacitive contribution, which not only translated into higher capacities but also longer durability, was associated to the small size of the crystal domains and the proper electrode composition. The performance of NixSn-based electrodes toward Na-ion storage was also characterized, reaching significant capacities above 200 mAh g(-1) at 0.1 A g(-1) but with a relatively fast fade over 120 continuous cycles. A relatively larger pseudocapacitive contribution was obtained in NixSn-based electrodes for SIBs when compared with LIBs, consistently with the lower contribution of the Na ion diffusion associated to its larger size. (C) 2019 Elsevier Ltd. All rights reserved.
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