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相关概念视频

Batteries and Fuel Cells03:12

Batteries and Fuel Cells

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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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Lung Capacity

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The air in the lungs is measured in volumes and capacities. Lung volume measures reflect the amount of air taken in, released, or left over after a lung function, like a single inhalation. Lung capacity measures are sums of two or more lung volume measures.
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Common Ion Effect

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
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Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
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Formation of Complex Ions03:45

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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相关实验视频

Updated: Jan 23, 2026

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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通过Rb调制释放O3型分层阴极容量,用于先进的离子电池.

Jian Qiu1, Pengzhi Li1, Miaomiao Jiang2

  • 1School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China.

ACS nano
|January 21, 2026
PubMed
概括

将少量 (Rb) 添加到O3型,,氧化物 (NaNM) 层层的氧化物中,可显著提高特定容量和循环稳定性. 这种优化是开发高性能离子电池的关键.

关键词:
在O3型的NaNi0.5Mn0.5O2中.层层的氧化物阴极 层层的氧化物阴极卢比调制是一种调制.离子电池是一种离子电池.结构的修改,结构的改变.

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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
  • 固态化学 固态化学

背景情况:

  • O3型层氧化物是离子电池的有希望的阴极材料.
  • 阶段过渡和缓慢的离子扩散限制了它们的实际性能.
  • 优化材料结构对于提高电池容量和稳定性至关重要.

研究的目的:

  • 研究 (Rb) 兴奋剂对O3型NaNi0.5Mn0.5O2 (NaNM) 层氧化物电化学性能的影响.
  • 了解Rb兴奋剂改善离子运输和结构稳定的机制.
  • 释放这些材料的近乎理论能力,用于实际应用.

主要方法:

  • 合成Rb-doped的NaNi0.5Mn0.5O2 (NaNMR) 材料. 这种材料的合成.
  • 电化学测试包括静电循环和速率能力测量.
  • 先进的表征技术 (例如XRD,XPS) 和理论计算 (例如DFT) 用于分析结构和电子特性.

主要成果:

  • 一分钟1%的Rb兴奋剂 (NaNMR-1) 显著提高了特定容量和循环稳定性.
  • NaNMR-1样本在0.2°C下达到235.1mAhg-1的可逆容量,在100个循环后保持93.1%.
  • 发现Rb装饰可以改善Na+运输道和加强TM-O键,减少离子迁移的能量障碍.

结论:

  • Rb调制是一种有效的策略,可以克服O3型层氧化物的局限性.
  • 这种方法大大提高了循环稳定性和特定容量,为高性能离子电池铺平了道路.
  • 这些发现突出了针对先进的储能材料的目标元素兴奋剂的潜力.