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Influence of Binder Coverage on Interfacial Chemistry of Thin Film LiNi0.6Mn 0.2Co0.2O2 Cathodes

Journal Article · · Journal of the Electrochemical Society (Online)
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In this work, we explore the influence of binder coverage and chemistry on the interfacial properties of the textured Ni-rich cathode LiNi0.6Mn0.2Co0.2O2. We find that the formation of the cathode/electrolyte interphase (CEI) composition varies significantly for cathodes coated with either poly(vinylene fluoride) (PVDF), carboxymethyl cellulose (CMC), or lithium polyacrylate (LiPAA) after cycling to high upper cutoff voltages (4.5 V vs Li/Li). The PVDF-coated samples had a thinner CEI and twice the relative concentration of LiF and Li2CO3 to LixPOyFz species in the CEI compared to the uncoated sample. This correlated with significantly lower interfacial impedance (285 vs ~1700 Ohm-cm2) and improved capacity retention between cycles of the PVDF-coated samples compared to the other binder compositions and the uncoated sample. CMC-coated samples performed worst, with a CEI comprised of greater amounts of LixPOyFz. In addition, we find the choice of binder results in the selective protection or promotion of electrolyte reactions at the (104) surface of the 622 cathode. This suggests that the choice of binder can impact the surface chemistry and performance of high voltage cathodes and supports an avenue for interest in multifunctional binders for stabilizing the CEI.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1602334
Alternate ID(s):
OSTI ID: 1607055
Journal Information:
Journal of the Electrochemical Society (Online), Journal Name: Journal of the Electrochemical Society (Online) Journal Issue: 4 Vol. 167; ISSN 1945-7111
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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