O3型層状酸化物カソードの容量をRb変調で解き放つ：先進ナトリウムイオン電池に向けて

関連する実験動画

Updated: Jan 23, 2026

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

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

Published on: November 11, 2013

Jian Qiu¹, Pengzhi Li¹, Miaomiao Jiang²

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

|January 21, 2026

Abstract:

Optimizing the Rb modulation strategy in O3-type NaNi_0.5Mn_0.5O₂ (NaNM) layered oxides addresses the practical challenges of phase transitions and slow ion diffusion, thereby unlocking near-theoretical capacity. Even with a minute 1% Rb doping, significant improvements in specific capacity and cycling stability are observed. The Na_0.99Rb_0.01Ni_0.5Mn_0.5O₂ (NaNMR-1) sample exhibits a reversible capacity of 235.1 mAh g^-1 at 0.2 C, maintaining 93.1% capacity retention after 100 cycles in a full cell configuration (NaNMR-1||HC). Theoretical calculations and comprehensive characterizations reveal that Rb decoration enhances Na⁺ transport channels and strengthens TM-O bonds, substantially reducing the energy barrier for ion migration and improving structural reversibility. This study underscores the potential of this approach to significantly enhance the cycle stability and specific capacity of O3-type layered oxide cathodes, promising for high-performance sodium-ion batteries.

キーワード:

O3型NaNi0.5Mn0.5O2 層状酸化物カソードルビジウム変調ナトリウムイオン電池構造改変

さらに関連する動画

Preparation of Graphene Liquid Cells for the Observation of Lithium-ion Battery Material

Preparation of Graphene Liquid Cells for the Observation of Lithium-ion Battery Material

Published on: February 5, 2019

Three-electrode Coin Cell Preparation and Electrodeposition Analytics for Lithium-ion Batteries

Three-electrode Coin Cell Preparation and Electrodeposition Analytics for Lithium-ion Batteries

Published on: May 22, 2018

関連する概念動画

Batteries and Fuel Cells

Batteries and Fuel Cells

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...

Lung Capacity

Lung Capacity

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.

Common Ion Effect

Common Ion Effect

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:

Precipitation of Ions

Precipitation of Ions

Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:

Ions as Acids and Bases

Ions as Acids and Bases

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:

Formation of Complex Ions

Formation of Complex Ions

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...