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Qualitative Analysis03:46

Qualitative Analysis

22.4K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
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Regulation of Sodium and Potassium01:26

Regulation of Sodium and Potassium

607
The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP).
Sodium Regulation
Sodium ions make up approximately 90% of extracellular cations, with a normal blood plasma concentration of 136–148 mEq/L. A decrease in blood volume and pressure triggers the release of renin from granular cells in the juxtaglomerular complex (JGC), primarily...
607
MOS Capacitor01:25

MOS Capacitor

839
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
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Ionic Crystal Structures02:42

Ionic Crystal Structures

14.4K
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...
14.4K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

41.7K
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. 
41.7K

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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
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替代后调制的坚固的层氧化物

Xu Gao1, Haoji Wang1, Huanqing Liu1

  • 1State Key Laboratory of Powder Metallurgy, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China.

Small methods
|August 12, 2023
PubMed
概括
此摘要是机器生成的。

一种新的后置换策略增强了离子电池 (SIB) 的层氧化物阴极材料. 这种方法提高了动力学和界面稳定性,提高了高级SIB应用程序的性能.

关键词:
电离子替代的替代过程涂层涂层是一种涂层.层层的氧化物 层层的氧化物离子电池 离子电池

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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:

  • 层氧化物具有高容量,但其动力学和界面不稳定性较差.
  • 现有的方法,如兴奋剂和涂层,无法同时解决散装和表面问题.
  • 剩余的性物种对层氧化物的性能和稳定性产生负面影响.

研究的目的:

  • 开发一种替代后策略,用于修改初级层氧化物颗粒.
  • 为了同时解决层氧化物中的散装和表面问题.
  • 为了提高离子电池 (SIB) 的层氧化物的电化学性能.

主要方法:

  • 对O3-NaNi1/3Fe1/3Mn1/3O2颗粒应用的替代后策略.
  • 通过调整热力学驱动力,从表面到散装进行受控的Ti输注.
  • 使用能量分散光谱 (EDS) 绘图进行表征,以确认Ti分布.
  • 电化学测试用于评估容量,速率能力和循环稳定性.

主要成果:

  • 实现了可深度控制的Ti注入,在初级颗粒中创建了类似梯度的分布.
  • 通过表面对散装的透反应,有效地减少剩余的性物种.
  • 在可逆容量 (135mAhg-1在C/10),速率能力 (74%在5C保持) 和长期循环稳定性 (在2C300个循环后80%的保持) 中显著改善.
  • 与传统方法相比,证明了增强的动力学和界面稳定性.

结论:

  • 拟议的替代后策略为修改分层氧化物颗粒提供了一种通用方法.
  • 这种方法有效地解决了层氧化物的体积和表面限制.
  • 开发的材料显示出作为高性能SIB的先进阴极的有前途潜力.