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Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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Batteries and Fuel Cells03:12

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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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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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Formation of Complex Ions03:45

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
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Ionic Bonding and Electron Transfer02:48

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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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Dendrite formation in solid-state batteries arising from lithium plating and electrolyte reduction.

Haoyu Liu1, Yudan Chen1, Po-Hsiu Chien1

  • 1Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, USA.

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Researchers uncovered two distinct mechanisms of dendrite formation in solid-state lithium batteries using advanced imaging. Understanding these processes is key to overcoming challenges in high-energy-density energy storage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Batteries

Background:

  • All-solid-state batteries promise high energy density and eco-friendliness.
  • Lithium metal anodes in these batteries are hindered by dendrite formation, impeding commercialization.

Purpose of the Study:

  • To elucidate the distinct mechanisms of dendrite formation in lithium/lithium lanthanum zirconium oxide/lithium solid-state batteries.
  • To provide insights for mitigating dendrite-related challenges in solid-state energy storage.

Main Methods:

  • Utilized non-invasive techniques: solid-state nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI).
  • Employed tracer-exchange NMR to analyze Li plating and Li+ reduction at interfaces and grain boundaries.
  • Applied in situ MRI to observe real-time dendrite growth dynamics.

Main Results:

  • Identified two primary dendrite formation mechanisms: rapid non-uniform Li plating and sluggish bulk Li+ reduction.
  • Observed localized Li+ reduction at Li7La3Zr2O12 grain boundaries.
  • Revealed a period of stalled dendrite growth between the two mechanisms.

Conclusions:

  • Dendrite formation in solid-state batteries is complex, influenced by amorphous/crystalline dendrites, solid electrolyte defect chemistry, and operating conditions.
  • This study deepens the fundamental understanding of dendrite growth in solid-state lithium batteries.
  • Findings offer valuable insights for developing strategies to suppress dendrite formation and enhance battery safety and performance.