Journal Article

IMPULSE-2020-00111

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Investigation of lithium-ion battery degradation mechanisms by combiningdifferential voltage analysis and alternating current impedance

Zhu, J. ; Dewi Darma, M. S. ; Knapp, M. ; Sørensen, D. R. ; Heere, M.MLZ* ; Fang, Q. ; Wang, X. ; Dai, H. ; Mereacre, L. ; Senyshyn, A. ; Wei, X. ; Ehrenberg, H.

2020
Elsevier New York, NY [u.a.]

Please use a persistent id in citations: doi:10.1016/j.jpowsour.2019.227575

Abstract: 18650-type cells with 2.5 Ah capacity are cycled at both 25 �C and 0 �C separately, and at 25 �C two chargingprotocols (constant current, and constant current-constant voltage charge) are used. Differential voltage analysis(dV/dQ) and alternating current (AC) impedance are mainly used to investigate battery degradation mechanismsquantitatively. The dV/dQ suggests that active cathode loss and loss of lithium inventory (LLI) are the dominatingdegradation factors. Significant microcracks are observed in the fatigued cathode particles from the scanningelectron microscopy (SEM) images. Crystal structure parameters of selected fatigued batteries at fully chargedstate are determined by in situ high-resolution neutron powder diffraction. Obvious increases of ohmic resistanceand solid electrolyte interphase (SEI) resistance occur when the battery capacity fade falls beneath 20%.Continuous charge transfer resistance and Warburg impedance coefficient (W.eff) increase are observed in thecourse of cycling. Correlation analysis is performed to bridge the gap between material loss as well as LLI andimpedance increase. The increase of the charge transfer resistance is related to both active cathode loss and LLI,and a functional relationship is revealed between LLI and W.eff regardless of the used cycling protocols.

Keyword(s): Energy (1st) ; Chemistry (2nd)

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Contributing Institute(s):

1. SPODI (SPODI)

Experiment(s):

1. SPODI: High resolution powder diffractometer (SR8a)

Appears in the scientific report 2020

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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 ; IF >= 5 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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