TY - JOUR
T1 - Alkylated LixSiyOz Coating for Stabilization of Li-rich Layered Oxide Cathodes
AU - Rosy,
AU - Haber, Shira
AU - Evenstein, Eliran
AU - Saha, Arka
AU - Brontvein, Olga
AU - Kratish, Yosi
AU - Bravo‐Zhivotovskii, Dmitry
AU - Apeloig, Yitzhak
AU - Leskes, Michal
AU - Noked, Malachi
N1 - Funding Information:
Rosy is thankful to the Planning and Budgeting Committee of the council of high education for awarding post-doctoral research fellowship. M.N. and M.L. are thankful to the Israeli council of high education, for Alon fellowship. S.H was supported by a research grant from the Yotam Project and the Weizmann Institute Sustainability and Energy Research Initiative. D.B.-Z. is grateful to the Ministry of Immigrant Absorption, Israel, for a Kamea fellowship. The work was made possible in part by the historic generosity of the Harold Perlman family. The project was conducted through the support of INREP, IMOE and of the Israel Research and Innovation authority through Kamin grant 68005. We thank the ISF, Israel, for equipment support (M.N. Grant no. 2028/17 and 2209/17) and funding (M.L. 1580/17).
Funding Information:
Rosy is thankful to the Planning and Budgeting Committee of the council of high education for awarding post-doctoral research fellowship. M.N. and M.L. are thankful to the Israeli council of high education, for Alon fellowship. S.H was supported by a research grant from the Yotam Project and the Weizmann Institute Sustainability and Energy Research Initiative. D.B.-Z., is grateful to the Ministry of Immigrant Absorption, Israel, for a Kamea fellowship. The work was made possible in part by the historic generosity of the Harold Perlman family. The project was conducted through the support of INREP, IMOE and of the Israel Research and Innovation authority through Kamin grant 68005. We thank the ISF, Israel, for equipment support (M.N., Grant no. 2028/17 and 2209/17) and funding (M.L., 1580/17).
Publisher Copyright:
© 2020
PY - 2020/12
Y1 - 2020/12
N2 - 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.
AB - 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.
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U2 - 10.1016/j.ensm.2020.08.015
DO - 10.1016/j.ensm.2020.08.015
M3 - Article
AN - SCOPUS:85090230065
SN - 2405-8297
VL - 33
SP - 268
EP - 275
JO - Energy Storage Materials
JF - Energy Storage Materials
ER -
