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相关概念视频

Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

1.3K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
1.3K
Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

1.0K
Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
1.0K
Precipitation Processes01:12

Precipitation Processes

350
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
350
Colloidal precipitates01:09

Colloidal precipitates

468
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
468
Precipitation of Ions03:11

Precipitation of Ions

27.4K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
27.4K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

16.6K
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...
16.6K

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相关实验视频

Updated: May 20, 2025

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
11:04

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

Published on: December 20, 2016

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固溶液反应增强了快速的离子迁移,以获得卓越的低温性能.

Jiao Li1, Jianfeng Ban2, Zhuoyan Zeng1

  • 1College of Chemistry, Xiangtan University, Xiangtan 411105, China.

Journal of colloid and interface science
|May 17, 2025
PubMed
概括

这项研究开发了一种用于离子电池 (SIB) 的新型分层阴极材料,在低温下保持出色的性能. 这种新材料可确保可靠的储能解决方案,用于电网应用,即使在零下环境.

关键词:
阴极材料是以阴极为材料的.长周期 长周期 长周期低温 低温 低温 低温 低温离子电池是一种离子电池.

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

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相关实验视频

Last Updated: May 20, 2025

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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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
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 由于资源丰富,离子电池 (SIB) 对电网存储充满希望.
  • SIB 的性能对温度非常敏感,特别是在零度以下的条件下,限制了它们的应用.
  • 为不同的温度环境开发可靠的SIB是一个关键的挑战.

研究的目的:

  • 创建一个分层的阴极材料,在低温下提高电化学性能.
  • 调查多重兴奋剂对SIB阴极的结构稳定性和循环性能的影响.
  • 为可靠的能量存储提供先进的正极材料提供见解.

主要方法:

  • 使用简单的sol-gel方法制造分层阴极材料.
  • 实施一个协同的Cu/Co/Mg多种兴奋剂战略.
  • 在各种温度下进行电化学性能测试,包括-20°C.

主要成果:

  • 一种新型材料Na0.7Ni0.25Cu0.1Co0.05Mg0.05Mn0.55O2 (NNCCMM) 被合成,具有高容量和结构稳定性.
  • 在低温和正常温度下,NNCCMM展示了非凡的循环稳定性和快速充电能力.
  • 在-20°C下,容量保持率为0.2°C的室温值的81.7%.

结论:

  • 这种Cu/Co/Mg多重兴奋剂策略有效地提高了SIB阴极材料的低温性能.
  • 在寒冷的环境中,NNCCMM为可靠和多功能离子电池应用提供了一个有前途的解决方案.
  • 这项研究扩大了SIB技术在电网存储和其他成本敏感应用中的潜力.