Alkylated LixSiyOz Coating for Stabilization of Li-rich Layered Oxide Cathodes

Rosy, Shira Haber, Eliran Evenstein, Arka Saha, Olga Brontvein, Yosi Kratish, Dmitry Bravo‐Zhivotovskii, Yitzhak Apeloig, Michal Leskes, Malachi Noked

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34 Scopus citations

Abstract

The commercialization of the high energy, lithium, and manganese-rich NCM (LMR-NCM) is impeded by its complex interfacial electrochemical processes, oxygen release, and surface degradation. Here, we introduced t-butyl-dimethylsilyllithium as a single-source precursor for depositing LixSiyOz with an integrated network of siloxane moieties as an artificial cathode/electrolyte interphase (ACEI) which stabilizes LMR-NCM by mitigating oxygen release, electrolyte degradation and preventing fractures. Using solid-state NMR coupled with dynamic nuclear polarization, detailed molecular-level characterization of the ACEI is presented. The proposed CEI enabled improved energy-density at high rates (644 Wh.kg-1, compared to uncoated material with 457 Wh.kg-1 at 4C) with suppressed parasitic reactions and O2 evolution. The efficacy of the CEI is demonstrated in full graphite/LMR-NCM pouch cells with ~ 35% enhanced capacity and >80% capacity retention over 200 cycles. Altogether, these results present the importance of careful selection and design of surface chemistry for stabilizing the electrode/electrolyte interphase in challenging battery chemistries.

Original languageEnglish
Pages (from-to)268-275
Number of pages8
JournalEnergy Storage Materials
Volume33
DOIs
StatePublished - Dec 2020

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© 2020

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