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相关概念视频

Ion Exchange01:17

Ion Exchange

1.1K
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
1.1K
Batteries and Fuel Cells03:12

Batteries and Fuel Cells

30.7K
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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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

804
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
804
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

1.3K
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
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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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阴离子阻断和多路径导电接口使室温以为基础的Ca-金属电池具有长寿命.

Xuedong He1, Jiarui Wang1, Qingyang Cao1

  • 1State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-Sen (Zhongshan) University, Guangzhou, 510275, P. R. China.

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概括

研究人员开发了第一个长寿命的纯盐以金属 (Ca-金属) 电池为基础的电池. 工程设计的Ca-金属接口克服了阳极被动化,使得稳定的循环和高容量保留用于先进的能量存储.

关键词:
在Ca-金属.阴离子腐蚀的腐蚀埃斯特电解质的电解质是什么接口的动力学 接口的动力学阶段间调节的调节.

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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:

  • 基于埃斯特的电解质在储存中很常见,但对于金属 (Ca金属) 电池来说是有问题的.
  • 由于离子腐蚀导致阳极被动化,Ca-金属电池面临纯盐电解质的挑战.
  • 稳定和快速的动力学接口对于持久的室温Ca金属电池运行至关重要.

研究的目的:

  • 为了展示第一个长寿命的纯盐 Ester 基Ca-金属电池.
  • 为了克服使用电解质的Ca-金属电池中阳极被动化的局限性.
  • 设计稳定和快速的动力学接口,以提高Ca-金属电池的性能.

主要方法:

  • 使用生物质衍生碳阴极.
  • 工程化Ca-金属接口与---铁-铁基无机盐和核心外铁 (Fe) 纳米晶体.
  • 作为阴离子阻断介质的内置碳 (C─N) 有机物.

主要成果:

  • 在基于纯盐 Ester 的 Ca-metal 电池中,在 25 mA g-1 时达到> 500 个周期,容量保持率为 85.4%.
  • 证明了0.53V的低Ca-金属沉积过电位 (vsCa/Ca2+).
  • 呈现稳定的Ca-金属沉积/剥离>950小时,具有6 mAh cm-2接口-稳定的沉积能力.

结论:

  • 成功开发了第一个长寿命的基于纯盐 Ester 的Ca-金属电池.
  • 具有多种相位和阴离子阻断能力的工程接口增强了动力学和可逆性.
  • 这项工作为以为基础的Ca-金属电池提供了一个可行的接口工程策略.