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Related Concept Videos

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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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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Batteries and Fuel Cells03:12

Batteries and Fuel Cells

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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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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

23.9K
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:
23.9K
Alkali Metals03:06

Alkali Metals

19.3K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
19.3K
Electron Affinity03:07

Electron Affinity

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The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion).
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Lithium Metal-Compatible Antifluorite Electrolytes for Solid-State Batteries.

Pengcheng Yu1,2,3, Haochang Zhang4, Fiaz Hussain1

  • 1Eastern Institute for Advanced Study, Eastern Institute of Technology, Ningbo, Zhejiang 315201, China.

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|April 23, 2024
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Researchers developed novel Li-rich antifluorite solid electrolytes with an antistructure design. These electrolytes offer high ionic conductivity and stability for advanced lithium metal solid-state batteries.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Lithium metal solid-state batteries offer high energy density and safety advantages over traditional lithium-ion batteries.
  • A key challenge is the lack of solid electrolytes with sufficient stability against lithium metal anode decomposition.
  • Existing electrolytes often lack the necessary ionic conductivity for practical applications.

Purpose of the Study:

  • To design and synthesize a novel solid electrolyte with intrinsic thermodynamic stability against lithium metal anodes.
  • To achieve high ionic conductivity and three-dimensional Li-ion transport pathways.
  • To demonstrate the potential of this new electrolyte in high-energy-density solid-state batteries.

Main Methods:

  • Designed and synthesized Li-rich antifluorite solid electrolytes with an antistructure.
  • Characterized ionic conductivity using electrochemical impedance spectroscopy.
  • Evaluated stability using Li-Li symmetric batteries.
  • Assembled and tested full cells with LiCoO2 cathodes and Li metal anodes.

Main Results:

  • Achieved high ionic conductivity of 2.1 × 10-4 S cm-1 at room temperature.
  • Demonstrated excellent stability in Li-Li symmetric cells, indicating good anode compatibility.
  • Successfully fabricated reversible full cells, showcasing practical battery performance.

Conclusions:

  • Li-rich antifluorite solid electrolytes with antistructure design exhibit intrinsic thermodynamic stability with Li metal anodes.
  • These electrolytes enable fast Li-ion transport and high ionic conductivity.
  • The developed materials show significant potential for next-generation high-energy-density solid-state batteries.