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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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The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
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The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Superior ion-conducting hybrid solid electrolyte for all-solid-state batteries.

Jae-Kwang Kim1, Johan Scheers, Tae Joo Park

  • 1School of Energy&Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 689-798 Ulsan (Republic of Korea); Department of Applied Physics, Chalmers University of Technology, 412 96 Göteborg (Sweden). jaekwang@unist.ac.kr.

Chemsuschem
|November 14, 2014
PubMed
Summary
This summary is machine-generated.

A novel hybrid solid electrolyte combining LiTFSI, Py14 TFSI ionic liquid, and TiO2 nanoparticles offers high ionic conductivity and stability. This advanced material enables high-performance solid-state batteries with excellent discharge capacity.

Keywords:
anionselectrochemistryenergy storageion pairsnanoparticles

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Development of high-performance solid electrolytes is crucial for safer and more efficient lithium-ion batteries.
  • Traditional liquid electrolytes pose safety risks, driving research into solid-state alternatives.
  • Achieving high ionic conductivity and stable interfaces remains a key challenge in solid-state battery technology.

Purpose of the Study:

  • To develop a high-performance hybrid solid electrolyte for lithium-ion batteries.
  • To investigate the synergistic effects of ionic liquid and nanoparticles on electrolyte properties.
  • To evaluate the electrochemical performance of solid-state batteries utilizing the developed electrolyte.

Main Methods:

  • Fabrication of a hybrid solid electrolyte using lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt, Py14 TFSI ionic liquid, and TiO2 nanoparticles.
  • Characterization of ionic conductivity, thermal stability, and interfacial resistance of the hybrid electrolyte.
  • Assessment of lithium transference number enhancement due to TiO2 nanoparticles' scavenger effect.
  • Fabrication and testing of pouch-type solid-state batteries with the hybrid electrolyte.

Main Results:

  • The hybrid solid electrolyte demonstrated high room temperature ionic conductivity.
  • Excellent thermal stability and low interface resistance with good electrode contact were achieved.
  • TiO2 nanoparticles significantly increased the lithium transference number via a scavenger effect.
  • The solid-state battery delivered a high initial discharge capacity of 150 mAh g⁻¹ at room temperature.
  • A reversible capacity of 106 mAh g⁻¹ was maintained at a 1C rate.

Conclusions:

  • The developed hybrid solid electrolyte offers a promising solution for high-performance solid-state batteries.
  • The combination of ionic liquid and TiO2 nanoparticles effectively enhances ionic conductivity and lithium-ion transport.
  • The facile preparation method and excellent properties make this hybrid electrolyte suitable for practical battery applications.