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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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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Lithium-sulfur battery cathode enabled by lithium-nitrile interaction.

Juchen Guo1, Zichao Yang, Yingchao Yu

  • 1School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, USA. jguo@engr.ucr.edu

Journal of the American Chemical Society
|December 14, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed a new lithium sulfide-carbon composite for high-energy batteries. This material effectively prevents polysulfide shuttling, leading to high capacity and efficiency in lithium ion batteries.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium sulfide (Li2S) is a promising cathode material for high-energy lithium ion batteries.
  • Preventing lithium polysulfide dissolution and shuttling is crucial for Li2S cathode stability.
  • Existing methods often require metallic lithium anodes, posing safety concerns.

Purpose of the Study:

  • To develop a novel lithium sulfide-carbon composite cathode material.
  • To create an inherent mechanism for sequestering lithium polysulfides within the cathode structure.
  • To evaluate the electrochemical performance of the new composite in lithium ion batteries.

Main Methods:

  • Synthesizing lithium sulfide-carbon composites by dispersing Li2S within a carbon host derived from a polymer precursor (polyacrylonitrile).
  • Utilizing interactions between lithium ions and nitrile groups in the polymer precursor to control Li2S distribution.
  • Carbonizing the precursor to form the Li2S-carbon composite structure.
  • Evaluating the composite as a cathode material in a half-cell lithium battery setup.

Main Results:

  • The synthesized Li2S-carbon composites demonstrated uniform dispersion of Li2S.
  • The composite architecture effectively sequestered lithium polysulfides, mitigating shuttling.
  • The cathode materials exhibited high galvanic charge/discharge capacities.
  • Excellent Coulombic efficiency was achieved during electrochemical cycling.

Conclusions:

  • The proposed composite architecture is effective in homogeneously distributing Li2S and sequestering polysulfides.
  • This approach offers a viable pathway for developing stable and high-performance lithium sulfide cathodes for advanced lithium ion batteries.
  • The method obviates the need for metallic lithium anodes, enhancing battery safety and energy density.