Use of sacrificial lithium nickel oxide for loading graphitic anode in Li-ion capacitors

• DOI: 10.1016/j.electacta.2015.12.034
• Publication Date: 2015-12-12T07:02:09Z
• Authors: P. Jeżowski; K. Fic; O. Crosnier; T. Brousse; F. Béguin
• Keywords: [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]; 02 engineering and technology; 0210 nano-technology; 7. Clean energy; [PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]

Abstract 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.