Video Experimental Relacionado

Updated: Jul 2, 2025

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Published on: December 20, 2016

Desvelando el papel de la fluoración en los electrolitos de éter hexacíclicos coordinados para baterías de litio de

Lan-Qing Wu¹, Zhe Li¹, Zhen-Yu Fan¹

¹Frontiers Science Center for New Organic Matter, Renewable Energy Conversion and Storage Center (RECAST), Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, China.

Journal of the American Chemical Society

|February 21, 2024

Resumen

Los éteres parcialmente fluorados, en particular los que tienen un grupo -CHF2, son prometedores para las baterías de metal de litio de alto voltaje (LMB). Estos electrolitos ofrecen un mejor transporte de iones y estabilidad, lo que permite una larga vida útil del ciclo incluso en condiciones de escasez.

Área de la Ciencia:

La electroquímica
Ciencias de los materiales
Tecnología de baterías

Sus antecedentes:

Los éteres fluorados son clave para las baterías de metal de litio de alto rendimiento (LMB) debido a su estabilidad.
Comprender cómo la fluoración afecta la solución iónica es crucial para optimizar el diseño del electrolito.
La mayoría de los electrolitos actuales utilizan grupos -CF3, lo que limita la exploración de otros efectos de fluoración.

Objetivo del estudio:

Sintetizar y evaluar éteres fluorados con diversos grados de fluoración (-CH2F, -CHF2, -CF3) como disolventes electrolitos para las LMB.
Investigar el impacto de la fluoración en la estructura de solvación, el transporte de iones y la deposición de litio.
Para evaluar el rendimiento de estos electrolitos en LMB de alto voltaje.

Principales métodos:

Síntesis de éteres hexacíclicos coordinados: EMP, F1EMP, F2EMP y F3EMP.
Caracterización electroquímica: estructura de solvación, transporte de iones de litio, cinética de deposición de litio y estabilidad a alto voltaje.
Cálculos teóricos y análisis espectroscópico.
Pruebas de célula completa con cátodos de alta tensión y condiciones de electrolito limitado/deficiente.

Principales resultados:

El poder solvente disminuye con el aumento de la fluoración, lo que lleva a una reducción de la conductividad iónica.
Los éteres parcialmente fluorados (-CHF2) presentan números de transferencia de Li+ más altos y densidades de corriente de intercambio.
El electrolito F2EMP demostró una retención de capacidad del 80% durante 168 ciclos en LMB de alto voltaje.
Se logró un rendimiento excelente en condiciones de electrolito magro y sin ánodo.

Conclusiones:

El grado de fluoración influye significativamente en las propiedades de los electrolitos y el rendimiento de los LMB.
Los éteres fluorados basados en CHF2 ofrecen un equilibrio óptimo de propiedades para aplicaciones de alta tensión.
Este estudio proporciona información para el diseño de electrolitos de éter fluorado avanzados para LMB prácticos de alto voltaje.

Más Videos Relacionados

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering

Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering

Published on: April 17, 2018

Videos de Conceptos Relacionados

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.

Ionic Bonding and Electron Transfer

Ionic Bonding and Electron Transfer

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.

Crown Ethers

Crown Ethers

Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether...

Halogens

Halogens

Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group.

Ionic Crystal Structures

Ionic Crystal Structures

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...

Acid Halides to Alcohols: LiAlH4 Reduction

Acid Halides to Alcohols: LiAlH₄ Reduction

Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...