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 language | English (US) |
|---|---|
| Pages (from-to) | 268-275 |
| Number of pages | 8 |
| Journal | Energy Storage Materials |
| Volume | 33 |
| DOIs | |
| State | Published - Dec 2020 |
Funding
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). 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).
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- General Materials Science
- Energy Engineering and Power Technology
