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Related Concept Videos

Interfacial Electrochemical Methods: Overview01:06

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Li-ion transport at the interface between a graphite anode and Li2CO3 solid electrolyte interphase: ab initio

Takeshi Baba1, Keitaro Sodeyama2, Yoshiumi Kawamura1

  • 1Frontier Research Center, Toyota Motor Corporation, 1200, Mishuku, Susono, Shizuoka, 410-1193, Japan.

Physical Chemistry Chemical Physics : PCCP
|March 12, 2020
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This study reveals key insights into lithium-ion (Li+) transport across battery interfaces. Understanding Li+ migration barriers at the anode-SEI interface is crucial for improving battery performance and safety.

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Area of Science:

  • Battery electrochemistry
  • Interface science
  • Materials science

Background:

  • Lithium-ion (Li+) transport across the anode and solid electrolyte interphase (SEI) is critical for battery performance.
  • Understanding interfacial properties is key to controlling Li+ migration.

Purpose of the Study:

  • Investigate Li+ migration between graphite anode (LiCx) and Li2CO3 SEI film.
  • Analyze structural, electronic, and free energy properties of Li+ transport.
  • Compare different graphite edge terminations and Li+ transfer scenarios.

Main Methods:

  • Utilized ab initio molecular dynamics and free energy calculations.
  • Validated computational models with bulk Li2CO3 and LiCx systems.
  • Sampled interfacial structures under thermodynamic equilibrium.

Main Results:

  • OH- and mixed-terminated graphite edges exhibited larger binding energies.
  • Li+ intercalation barriers from SEI to LiC24 exceeded 1.2 eV across all cases.
  • Calculated Li+ charges remained largely unchanged during intercalation.
  • Modeled free energy profiles under charging/discharging, revealing a ca. 0.5 eV barrier during charging.

Conclusions:

  • The study provides crucial insights into Li+ transport mechanisms at battery interfaces.
  • The findings contribute to understanding and controlling Li+ migration for enhanced battery design.
  • The developed model aligns with experimental observations for charging processes.