Journal Article

IMPULSE-2017-00090

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Aging behavior of lithium iron phosphate based 18650-type cells studied by in situ neutron diffraction

Paul, N. (Corresponding author)MLZ* ; Wandt, J. ; Seidlmayer, S.MLZ* ; Schebesta, S. ; Mühlbauer, M. J. ; Dolotko, O.MLZ* ; Gasteiger, H. A. ; Gilles, R.MLZ*

2017
Elsevier New York, NY [u.a.]

Please use a persistent id in citations: doi:10.1016/j.jpowsour.2017.01.134

Abstract: The aging behavior of commercially produced 18650-type Li-ion cells consisting of a lithium iron phosphate (LFP) based cathode and a graphite anode based on either mesocarbon microbeads (MCMB) or needle coke (NC) is studied by in situ neutron diffraction and standard electrochemical techniques. While the MCMB cells showed an excellent cycle life with only 8% relative capacity loss (i.e., referenced to the capacity after formation) after 4750 cycles and showed no capacity loss on storage for two years, the needle coke cells suffered a 23% relative capacity loss after cycling and a 11% loss after storage. Based on a combination of neutron diffraction and electrochemical characterization, it is shown that the entire capacity loss for both cell types is dominated by the loss of active lithium; no other aging mechanisms like structural degradation of anode or cathode active materials or deactivation of active material could be found, highlighting the high structural stability of the active material and the excellent quality of the investigated cells.

Keyword(s): Energy (1st) ; Materials Science (2nd) ; Industrial Application (2nd) ; Condensed Matter Physics (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:
; 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 ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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