Journal Article

IMPULSE-2022-00024

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Investigation of capacity fade for 18650-type lithium-ion batteries cycled in different state of charge (SoC) ranges

Zhu, J. (Corresponding author) ; Knapp, M. ; Sørensen, D. R. ; Heere, M.MLZ* ; Darma, M. S. D. ; Müller, M. ; Mereacre, L. ; Dai, H. ; Senyshyn, A.MLZ* ; Wei, X. ; Ehrenberg, H.

2021
Elsevier New York, NY [u.a.]

Please use a persistent id in citations: doi:10.1016/j.jpowsour.2020.229422

Abstract: 18650-type cells comprising of LiNi0.5Co0.2Mn0.3O2 and LiNi0.9Co0.05Al0.05O2 as cathode blend and graphite as anode are cycled in various SoC ranges. Differing capacity fade is found, indicating that cycling in a medium SoC range results in lower capacity loss and behaves better than including high or low SoC in the cycling ranges. Cycling to low SoC tends to have nonlinear capacity fade (sudden capacity drop). Non-destructive methods, i.e. in situ neutron powder diffraction (NPD) and alternating current (AC) impedance, are employed to study the degradation mechanisms. Lithiated cathode loss and loss of lithium inventory (LLI) are calculated from crystal structure parameters refined from the in situ NPD. LLI is the dominating degradation factor for the differing capacity fade of cells. Lithiated cathode loss and solid electrolyte interphase (SEI) growth are deemed to be main fatigue reasons behind the LLI. By investigating the sensitivity of impedance parameters concerning the change in battery capacity, both ohmic resistance (R0) and SEI resistance (R1) present a linear relationship with the change of capacity for both, linear and nonlinear degradation, i.e. R0 and R1 follow the sudden capacity drop, which is ascribed to the formation of new SEI as evidenced by scanning electron microscopy (SEM) images.

Keyword(s): Energy (1st) ; Crystallography (2nd) ; Industrial Application (2nd)

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Contributing Institute(s):

1. SPODI (SPODI)

Experiment(s):

1. SPODI: High resolution powder diffractometer (SR8a)

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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