Type

Journal Article

Authors

Colm O'Dwyer
Justin D. Holmes
John O'Connell
David McNulty
Hugh Geaney

Subjects

Chemistry

Topics
foams ions lithium lithium ion batteries high temperature anneals batteries and energy storage charge discharge cycle current collector nio nanoparticles cyclic voltammetry electrochemical activities electrochemical response electric current collectors hydrothermal formations electric batteries

Assessing charge contribution from thermally treated Ni foam as current collectors for Li-ion batteries (2016)

Abstract In this report we have investigated the use of Ni foam substrates as anode current collectors for Li-ion batteries. As the majority of reports in the literature focus on hydrothermal formation of materials on Ni foam followed by a high temperature anneal/oxidation step, we probed the fundamental electrochemical responses of as received Ni foam substrates and those subjected to heating at 100°C, 300°C and 450°C. Through cyclic voltammetry and galvanostatic testing, it is shown that the as received and 100°C annealed Ni foam show negligible electrochemical activity. However, Ni foams heated to higher temperature showed substantial electrochemical contributions which may lead to inflated capacities and incorrect interpretations of CV responses for samples subjected to high temperature anneals. XRD, XPS and SEM analyses clearly illustrate that the formation of electrochemically active NiO nanoparticles on the surface of the foam is responsible for this behavior. To further investigate the contribution of the oxidized Ni foam to the overall electrochemical response, we formed Co3O4 nanoflowers directly on Ni foam at 450°C and showed that the resulting electrochemical response was dominated by NiO after the first 10 charge/discharge cycles. This report highlights the importance of assessing current collector activity for active materials grown on transition metal foam current collectors for Li-ion applications.
Collections Ireland -> University College Cork -> College of Science, Engineering and Food Science
Ireland -> University College Cork -> Tyndall National Institute
Ireland -> University College Cork -> Tyndall National Institute - Journal Articles
Ireland -> University College Cork -> Chemistry
Ireland -> University College Cork -> Chemistry - Journal Articles
Ireland -> University College Cork -> Research Institutes and Centres

Full list of authors on original publication

Colm O'Dwyer, Justin D. Holmes, John O'Connell, David McNulty, Hugh Geaney

Experts in our system

1
Colm O'Dwyer
University College Cork
Total Publications: 121
 
2
Justin D. Holmes
University College Cork
Total Publications: 182
 
3
John O'Connell
University College Cork
Total Publications: 17
 
4
David McNulty
University College Cork
Total Publications: 20
 
5
Hugh Geaney
University College Cork
Total Publications: 33