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Related Concept Videos

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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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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Electrolyte and Nonelectrolyte Solutions02:21

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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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Alkali Metals03:06

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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
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Electrolysis03:00

Electrolysis

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Ionic Bonds00:42

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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
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Related Experiment Video

Updated: Jun 3, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Li2ZrF6-based electrolytes for durable lithium metal batteries.

Qingshuai Xu1, Tan Li1, Zhijin Ju2

  • 1School of Environment and Energy, State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou, China.

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|January 8, 2025
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Adding monoclinic lithium hexafluorozirconate (m-Li2ZrF6) nanoparticles to electrolytes stabilizes solid-electrolyte interphases in lithium metal batteries (LMBs). This innovation enhances ion conductivity and suppresses dendrite growth for durable, high-rate performance.

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium metal batteries (LMBs) offer high energy density but suffer from lithium dendrite formation and capacity decay.
  • A stable solid-electrolyte interphase (SEI) is crucial for high-rate, long-life LMBs, yet remains a significant challenge.
  • Current non-aqueous electrolytes react with highly active lithium, compromising battery safety and performance.

Purpose of the Study:

  • To develop a novel electrolyte additive for enhancing the stability and performance of lithium metal batteries.
  • To investigate the in situ formation of a stable solid-electrolyte interphase using lithium hexafluorozirconate nanoparticles.
  • To demonstrate improved Li-ion conductivity and dendrite suppression in LMBs.

Main Methods:

  • Addition of excess monoclinic lithium hexafluorozirconate (m-Li2ZrF6) nanoparticles to a commercial LiPF6-based carbonate electrolyte.
  • Electrochemical studies under applied voltage to induce ZrF6(2-) ion release and SEI formation.
  • Computational modeling and cryogenic transmission electron microscopy (cryo-TEM) to analyze SEI structure and Li-ion transfer.
  • Battery cycling tests with LiFePO4 cathodes and 3D Li-carbon anodes.

Main Results:

  • In situ formation of a stable trigonal lithium hexafluorozirconate (t-Li2ZrF6)-rich SEI layer with high Li-ion conductivity.
  • Marked enhancement of Li-ion transfer and significant suppression of lithium dendrite growth, confirmed by computational and cryo-TEM studies.
  • LMBs demonstrated excellent cycling stability, retaining over 80.0% capacity after 3,000 cycles at 1C/2C rates.

Conclusions:

  • The developed Li2ZrF6-based electrolyte effectively creates a robust SEI, addressing key challenges in LMB technology.
  • This approach offers a reliable solution for durable, high-rate lithium metal batteries.
  • The findings represent a significant advancement in materials for next-generation energy storage.