Nonpassivated Silicon Anode Surface
- 10 June 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 12 (23), 26593-26600
- https://doi.org/10.1021/acsami.0c03799
Abstract
A stable solid electrolyte interphase (SEI) has been proven to be a key enabler to most advanced battery chemistries, where the reactivity between the electrolyte and the anode operating beyond the electrolyte stability limits must be kinetically suppressed by such SEIs. The graphite anode used in state-of-the-art Li-ion batteries presents the most representative SEI example. Because of similar operation potentials between graphite and silicon (Si), a similar passivation mechanism has been thought to apply on the Si anode when using the same carbonate-based electrolytes. In this work, we found that the chemical formation process of a proto-SEI on Si is closely entangled with incessant SEI decomposition, detachment, and reparation, which lead to continuous lithium consumption. Using a special galvanostatic protocol designed to observe the SEI formation prior to Si lithiation, we were able to deconvolute the electrochemical formation of such dynamic SEI from the morphology and mechanical complexities of Si and showed that a pristine Si anode could not be fully passivated in carbonate-based electrolytes.Funding Information
- University of Colorado Boulder
- Vehicle Technologies Program (DE-AC36-08GO28308)
This publication has 33 references indexed in Scilit:
- Insight on lithium metal anode interphasial chemistry: Reduction mechanism of cyclic ether solvent and SEI film formationEnergy Storage Materials, 2019
- In situ quantification of interphasial chemistry in Li-ion batteryNature Nanotechnology, 2018
- The Chemistry of Electrolyte Reduction on Silicon Electrodes Revealed by in Situ ATR-FTIR SpectroscopyThe Journal of Physical Chemistry C, 2017
- Review—SEI: Past, Present and FutureJournal of the Electrochemical Society, 2017
- Voltage Dependent Solid Electrolyte Interphase Formation in Silicon Electrodes: Monitoring the Formation of Organic Decomposition ProductsChemistry of Materials, 2015
- Electrode–Electrolyte Interface in Li-Ion Batteries: Current Understanding and New InsightsThe Journal of Physical Chemistry Letters, 2015
- Electrolytes and Interphases in Li-Ion Batteries and BeyondChemical Reviews, 2014
- Nonflammable electrolyte enhances battery safetyProceedings of the National Academy of Sciences of the United States of America, 2014
- Role of Solution Structure in Solid Electrolyte Interphase Formation on Graphite with LiPF6 in Propylene CarbonateThe Journal of Physical Chemistry C, 2013
- Differentiating Contributions to “Ion Transfer” Barrier from Interphasial Resistance and Li+ Desolvation at Electrolyte/Graphite InterfaceLangmuir, 2010