Journal
ELECTROCHIMICA ACTA
Volume 206, Issue -, Pages 440-445Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.12.034
Keywords
Lithium-ion capacitors; pre-lithiation; storage mechanism; positive electrode material; sacrificial lithium nickel oxide
Categories
Funding
- Foundation for Polish Science (FNP)
- European Union Regional Development Fund
- French embassy in Poland [31438NH]
- French Ministere des affaires etrangeres et du developpement international [31438NH]
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The use of non-stoichiometric lithium nickel oxide, being a part of the activated carbon positive electrode in lithium-ion capacitors, is presented as an alternative to the use of metallic lithium for graphite pre-lithiation. During the first cycle, lithium ions are irreversibly extracted from the Li0.65Ni1.35O2 host structure and intercalated into the graphite negative electrode. Once extraction and pre-lithiation are completed, activated carbon becomes the only active material for electrical double-layer storage at the positive electrode, while reversible lithium intercalation occurs at the graphite negative one. Since the lithium ions extraction occurs at a potential of 4.2 V vs. Li/Li+, electrolyte oxidation is prevented, and the cell displays a good cyclability in the potential range from 2.2 V to 3.8 V. (c) 2015 Elsevier Ltd. All rights reserved.
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