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Operando Quantification of (De)Lithiation Behavior of Silicon-Graphite Blended Electrodes for Lithium-Ion Batteries

Journal Article · · Advanced Energy Materials
 [1];  [2];  [2];  [2];  [2]
  1. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Delaware, Newark, DE (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
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Due to the high lithium capacity of silicon, the composite (blended) electrodes containing silicon (Si) and graphite (Gr) particles are attractive alternatives to the all-Gr electrodes used in conventional lithium-ion batteries. In this Communication, the lithiation and delithiation in the Si and Gr particles in a 15 wt% Si composite electrode is quantified for each component using energy dispersive X-ray diffraction. This quantification is important as the components cycle in different potential regimes, and interpretation of cycling behavior is complicated by the potential hysteresis displayed by Si. The lithiation begins with Li alloying with Si; lithiation of Gr occurs at later stages when the potential dips below 0.2 V (all potentials are given vs. Li/Li+). In the 0.2 – 0.01 V range, the relative lithiation of Si and Gr is ~58% and 42%, respectively. During delithiation, Li+ ion extraction occurs preferentially from Gr in the 0.01 – 0.23 V range and from Si in the 0.23 – 1.0 V range; that is, the delithiation current is carried sequentially, first by graphite and then by silicon. Furthermore, these trends can be used for rational selection of electrochemical cycling windows that limits volumetric expansion in Si particles, thereby extending cell life.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1496633
Alternate ID(s):
OSTI ID: 1489418
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 8 Vol. 9; ISSN 1614-6832
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

SnO 2 as Advanced Anode of Alkali‐Ion Batteries: Inhibiting Sn Coarsening by Crafting Robust Physical Barriers, Void Boundaries, and Heterophase Interfaces for Superior Electrochemical Reaction Reversibility journal December 2019
Low‐Temperature Charging and Aging Mechanisms of Si/C Composite Anodes in Li‐Ion Batteries: An Operando Neutron Scattering Study journal December 2019
Recent Progress in Advanced Characterization Methods for Silicon‐Based Lithium‐Ion Batteries journal May 2019

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Related Subjects

25 ENERGY STORAGE
X-ray diffraction
capacity quantification
electrochemistry
graphite silicon