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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Quantifying inactive lithium in lithium metal batteries.

Chengcheng Fang1, Jinxing Li2, Minghao Zhang2

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Unreacted metallic lithium (Li0) is the main cause of inactive lithium and capacity loss in lithium metal anodes, not solid electrolyte interphase compounds. This finding enables strategies for more efficient lithium plating and stripping for next-generation batteries.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Lithium metal anodes offer high theoretical capacity but are hindered by dendrite growth and low Coulombic efficiency, preventing commercial use.
  • Inactive lithium, comprising Li+ in the solid electrolyte interphase and unreacted metallic Li0, leads to capacity loss and safety concerns.
  • Existing diagnostic tools lack the ability to quantitatively distinguish between Li+ and Li0, limiting understanding of inactive lithium formation.

Purpose of the Study:

  • To establish an analytical method for quantifying unreacted metallic lithium (Li0) in lithium metal anodes.
  • To identify the primary source of inactive lithium and capacity loss in these anodes.
  • To elucidate the formation mechanism of inactive lithium and the cause of low Coulombic efficiency.

Main Methods:

  • Development and application of titration gas chromatography to quantify unreacted metallic Li0.
  • Coupling Li0 quantification with cryogenic electron microscopy (scanning and transmission) for microstructural and nanostructural analysis.
  • Investigation across different electrolyte types to understand inactive lithium formation.

Main Results:

  • Unreacted metallic Li0, rather than Li+ in the solid electrolyte interphase, is identified as the dominant contributor to inactive lithium and capacity loss.
  • The study establishes the formation mechanism of inactive lithium by correlating Li0 content with microstructural and nanostructural observations.
  • The underlying cause of low Coulombic efficiency during lithium plating and stripping is determined.

Conclusions:

  • Titration gas chromatography provides a quantitative method to assess inactive lithium in Li metal anodes.
  • Focusing on mitigating unreacted metallic Li0 formation is crucial for improving lithium metal anode performance.
  • Proposed strategies aim to enhance lithium plating and stripping efficiency for advanced high-energy batteries.