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Acid Halides to Alcohols: LiAlH4 Reduction01:19

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Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
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Lithium dialkyl cuprate, also known as Gilman reagents, selectively reduces acid halides to ketones. The acid chloride is treated with Gilman reagent at −78 °C in the presence of ether solution to produce a ketone in good yield.
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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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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Multi-Electron Transfer Halide Cathode Materials Based on Intercalation-Conversion Reaction Towards All-Solid-State

Xu Zhou1, Ming Jiang2, Yuhao Duan1,3

  • 1Division of Energy Storage, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.

Angewandte Chemie (International Ed. in English)
|December 3, 2024
PubMed
Summary
This summary is machine-generated.

New halide cathode materials, LixFeXx+2, significantly boost all-solid-state lithium battery (ASSLB) energy density. These materials enable catholyte-free designs, achieving high capacity and ionic conductivity for safer, more powerful batteries.

Keywords:
Halide cathode materialsHigh-energy-densityIntercalation-conversion reactionMulti-electron transferSolid-state lithium batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • All-solid-state lithium batteries (ASSLBs) promise enhanced safety and energy density compared to conventional lithium-ion batteries.
  • Current ASSLBs are limited by low-capacity oxide cathode materials that rely on intercalation mechanisms and require significant catholyte content.
  • Developing high-performance cathode materials is crucial for advancing ASSLB technology.

Purpose of the Study:

  • To introduce novel halide cathode materials (LixFeXx+2) as alternatives to conventional oxide cathodes in ASSLBs.
  • To investigate the electrochemical performance and operating mechanism of these new halide materials.
  • To demonstrate the potential for high energy density and improved safety in ASSLBs utilizing these advanced cathodes.

Main Methods:

  • Synthesis and characterization of LixFeXx+2 (X=Cl, Br) cathode materials.
  • Electrochemical testing of catholyte-free ASSLBs incorporating LiFeCl3 active material (95 wt%).
  • Analysis of the intercalation-conversion coupling reaction mechanism, including the role of amorphous Fe formation.

Main Results:

  • LixFeXx+2 materials operate via a 3 mol e- transfer intercalation-conversion coupling reaction, offering higher capacity than traditional oxides.
  • Catholyte-free ASSLBs using 95 wt% LiFeCl3 achieved a capacity of 446 mAh g-1 and energy density of 912 Wh kg-1.
  • Amorphous Fe formed during conversion catalyzes the reverse reaction, enabling reversible intercalation-conversion and high cycling stability.

Conclusions:

  • Halide cathode materials (LixFeXx+2) represent a significant advancement for high-energy-density ASSLBs.
  • The unique intercalation-conversion mechanism and catholyte-free design overcome limitations of oxide cathodes.
  • These findings pave the way for next-generation safer and more powerful solid-state batteries.