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Calendar-life versus cycle-life aging of lithium-ion cells with silicon-graphite composite electrodes

Journal Article · · Electrochimica Acta
 [1];  [1];  [1];  [1];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
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The use of blended silicon-graphite (Si-Gr) negative electrodes increases the energy density of lithium-ion cells over those containing only graphite (Gr) electrodes. However, volume changes in the Si particles that occur during cycling causes deterioration of the solid-electrolyte interphase (SEI) layer on the particles resulting in further electrolyte reduction that immobilizes Li+ ions and, therefore, capacity fade. Because the volume changes are not expected to occur during a potentiostatic hold (referred to as calendar-life aging), by comparison of cycle-life and calendar-life aged cells one can expect to assess the role of volume changes in the deterioration of cell performance. To this end, cells with Si-Gr and Gr negative electrodes (and Li1.03(Ni0.5Co0.2Mn0.3)0.97O2 containing positive electrodes) were assembled, tested, and compared using cycle-life and calendar-life aging protocols. As expected, the capacity loss of the cycle-life aged cells was higher than that of the calendar-life aged cells. However, the measurable capacity loss for the calendar-life aged cells indicated continued immobilization of Li+ ions. Furthermore, electrolytes extracted from the calendar-life aged cells showed more LiPF6 hydrolysis products than those extracted from the cycle-life aged cells. In conclusion, we discuss possible mechanistic causes for the observed aging behaviors in this article.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1465507
Alternate ID(s):
OSTI ID: 1562991
OSTI ID: 23117257
Journal Information:
Electrochimica Acta, Journal Name: Electrochimica Acta Journal Issue: C Vol. 280; ISSN 0013-4686
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Operando Quantification of (De)Lithiation Behavior of Silicon-Graphite Blended Electrodes for Lithium-Ion Batteries journal January 2019
Rapid coating of asphalt to prepare carbon-encapsulated composites of nano-silicon and graphite for lithium battery anodes journal December 2019
Fast Charging of Li-Ion Cells: Part I. Using Li/Cu Reference Electrodes to Probe Individual Electrode Potentials journal January 2019
Critical Review of the Use of Reference Electrodes in Li-Ion Batteries: A Diagnostic Perspective journal January 2019

Figures / Tables (15)

Table 1(p. 19)table Table 1
Table 2(p. 20)table Table 2
Table 3(p. 21)table Table 3
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Table S1(p. 30)table Table S1
Fig. S1(p. 31)figure Fig. S1
Fig. S2(p. 32)figure Fig. S2
Figure S3(p. 33)figure Figure S3
Figure S4(p. 34)figure Figure S4

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Related Subjects

25 ENERGY STORAGE
FEC
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electrochemical performance
electrolyte NMR
reference electrode