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Revisiting Solid Electrolyte Interphase on the Carbonaceous Electrodes Using Soft X-ray Absorption Spectroscopy.

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ACS Applied Materials & Interfaces
|August 9, 2018
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Summary
This summary is machine-generated.

The solid electrolyte interphase (SEI) layer on carbonaceous anodes can reversibly form and decompose, challenging previous assumptions for lithium-ion and sodium-ion batteries.

Keywords:
Li- and Na-ion batteriesSEI layercarbon anodeelectrolyte decompositionreversible surface reaction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Surface Chemistry

Background:

  • The solid electrolyte interphase (SEI) layer on carbonaceous anodes is typically formed by irreversible electrolyte decomposition, crucial for Li-ion battery stability.
  • Transition metal oxide anodes exhibit reversible electrolyte decomposition, contrasting with carbonaceous materials.

Purpose of the Study:

  • To investigate the electrochemical behavior of SEI formation on carbonaceous anode materials.
  • To determine if SEI formation/decomposition is exclusively irreversible for carbonaceous anodes.

Main Methods:

  • Soft X-ray absorption spectroscopy was employed to study the SEI layer on carbonaceous anode materials.
  • Electrochemical cycling of Li-ion and Na-ion battery systems with carbonaceous anodes.

Main Results:

  • Reversible formation and decomposition of the SEI layer were observed on carbonaceous materials.
  • This reversible behavior was confirmed in both lithium-ion and sodium-ion battery systems.

Conclusions:

  • The SEI layer on carbonaceous anodes can exhibit reversible behavior, contrary to established understanding.
  • This finding necessitates a revised comprehension of interfacial chemistry in carbonaceous anodes for Li- and Na-ion batteries.