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Related Concept Videos

Controlled-Potential Coulometry: Electrolytic Methods01:17

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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
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Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
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Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
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A Powerful Protocol Based on Anode-Free Cells Combined with Various Analytical Techniques.

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Anode-free lithium metal batteries (AFLMBs) face challenges from interfacial irreversible phenomena. This study introduces a protocol using anode-free cells and advanced analytics to quantify and mitigate these issues for improved battery performance.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium (Li) metal offers high energy density but poses safety risks due to its reactivity.
  • Anode-free lithium metal batteries (AFLMBs) present advantages in energy density, cost, and safety during production.
  • Interfacial irreversible phenomena, including electrolyte decomposition and lithium plating/stripping issues, limit the cycle life and capacity retention of AFLMBs.

Purpose of the Study:

  • To develop and present an integrated protocol for quantifying various sources of irreversible Coulombic efficiency (irr-CE) in AFLMBs and traditional lithium metal batteries (LMBs).
  • To decouple and identify the intrinsic reasons behind individual irreversible reactions occurring at the interfaces within these battery systems.
  • To demonstrate the utility of this protocol in screening and developing new electrolyte formulations and artificial protective layers.

Main Methods:

  • An integrated protocol combining Li||Cu, cathode||Li, and cathode||Cu cell configurations.
  • Utilizing advanced analytical techniques such as transmission X-ray microscopy (TXM) for visualizing Li plating/stripping, nuclear magnetic resonance (NMR) spectroscopy for quantifying dead lithium, and gas chromatography-mass spectrometry (GC-MS) for decoupling interfacial reactions.
  • Quantitative evaluation of Li metal deposition, solid electrolyte interphase (SEI) formation and fracture, lithium dendrite growth, and electrolyte decomposition mechanisms.

Main Results:

  • The proposed protocol successfully decouples and quantifies individual sources of irr-CE in AFLMBs and LMBs.
  • Visualization and quantification of dead lithium formation, SEI evolution, lithium dendrite propagation, and electrolyte decomposition pathways were achieved.
  • The anode-free configuration proved effective in screening and developing novel electrolyte formulations and protective layers.

Conclusions:

  • The integrated protocol based on anode-free cells and advanced analytical tools provides a powerful method for understanding interfacial irreversible phenomena in lithium metal batteries.
  • This approach is crucial for improving the cycle life and capacity retention of AFLMBs by addressing key loss mechanisms.
  • The methodology can be extended to investigate other metal batteries and solid-state anode-free systems, paving the way for next-generation energy storage.