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相关概念视频

Ionic Bonds00:42

Ionic Bonds

118.0K
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.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
118.0K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

41.2K
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. 
41.2K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

16.9K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
16.9K
Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

62.3K
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.
62.3K
Ionic Strength: Overview01:12

Ionic Strength: Overview

1.3K
The ionic strength of a solution is a quantitative way of expressing the total electrolyte concentration of a solution. This concept was first introduced in 1921 by two American physical chemists, Gilbert N. Lewis and Merle Randall, while describing the activity coefficient of strong electrolytes. During the calculation of ionic strength (I or μ), all the cations and anions are considered. However, the concentration (c) of an ion with a greater charge number (z) has a greater contribution...
1.3K
Electrolysis03:00

Electrolysis

26.0K
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...
26.0K

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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协调驱动的交联电解质用于快速离子导电和固态电池应用.

Xiao-Xue Wang1,2, De-Hui Guan1,2, Xin-Yue Ma1

  • 1State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China.

Angewandte Chemie (International ed. in English)
|November 30, 2024
PubMed
概括

本研究介绍了一种使用金属有机多面体和纤维素共聚合物的新型固体聚合物电解质,用于更安全,高能可充电电池. 这种新材料可以快速运输离子,从而提高电池的性能和寿命.

关键词:
金属电池的电池是金属电池.-O2电池的电池电池是什么?聚合物电解质的聚合物电解质.固态空气阴极是一种固态空气阴极.固态电解质 固态电解质

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 聚合物化学 聚合物化学

背景情况:

  • 带有金属阳极的可充电电池具有高能量密度,但由于树突和易燃液体电解质而面临安全问题.
  • 开发稳定,高性能固体聚合物电解质对于推进下一代能源存储至关重要.
  • 当前的固体电解质往往与低离子导电性和有限的电化学稳定性作斗争.

研究的目的:

  • 为高性能固体聚合物电解质设计一种新的协调驱动的交联网络.
  • 为了提高基可充电电池的安全性和能量密度.
  • 研究金属有机多面体 (MOP) 在固体聚合物电解质设计中的潜力.

主要方法:

  • 合成了一种基于纤维素的共聚合物,并将其与金属有机多面体 (MOP) 协调.
  • 为离子 (Li+) 运输设计了一个超交联的MOP (CHMOP-Li) 聚合物网络.
  • 使用开发的电解质制造固态金属和氧 (Li-O2) 电池.

主要成果:

  • 在25°C达到1.02×10-3 S cm-1的高Li+导电性和0.75.7的高Li+转移数.
  • 证明了CHMOP-Li电解质的广泛的电化学稳定性窗口和出色的热稳定性.
  • 在3200小时循环后,在对称电池中防止短路,在金属电池中达到300Wh kg-1.
  • 固态Li-O2电池表现出500个循环,具有15740mAhg-1.0的高放电容量.

结论:

  • 协调驱动的交叉连接战略为设计先进的固体聚合物电解质提供了一个可行的途径.
  • CHMOP-Li电解质为安全,高能量密度的可充电电池提供了一个有前途的解决方案.
  • 这种方法为下一代可持续电池技术铺平了道路.