相关实验视频

Updated: Jun 4, 2025

Fabrication of VB2/Air Cells for Electrochemical Testing

Fabrication of VB2/Air Cells for Electrochemical Testing

Published on: August 5, 2013

控制的异质离子协调花形超分子阴极用于离子储存

Yue Lu¹, Siyang Han¹, Jingang Zheng¹

¹School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, China.

ACS applied materials & interfaces

|December 20, 2024

概括

一种新型的-超分子花形材料 (VSF) 与受控异价 (V5+/V4+) 合成用于高性能离子电池 (ZIB). 这种材料表现出优越的容量和循环稳定性,使能有效储存能量.

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:

基于的材料对离子电池 (ZIB) 是有前途的,因为它们具有多种氧化状态和氧化还原活性.
对ZIBs进行异质氧化的受控合成仍然是一个重大挑战.

研究的目的:

为ZIBs开发一种绿色和高效的方法,用于制备以控制的异价为基础的材料.
为了研究合成材料作为ZIB中的阴极的电化学性能.

主要方法:

一种超分子花形材料 (VSF) 在水溶液中使用NH4VO3和六甲基甲胺合成.
在预后确定了最佳的VSF材料 (PVSF-2/1),V5+/V4+比为2/1 .
使用硬币电池和袋式电池评估了电化学性能,包括特定容量,速率能力和循环稳定性.

主要成果:

PVSF-2/1阴极在0.2 A g-1下达到398.9 mAh g-1的高特异容量,显著超过纯VO2和V2O5.5的性能.
该材料表现出极好的循环稳定性,在2000个循环后在5.0 A g-1下保留了225 mAh g-1.
ZnPVSF-2/1袋式电池表现出令人满意的339 mAh g-1在0.2 A g-1的特定容量.

结论:

合成的PVSF-2/1材料为高性能ZIB提供了一个有前途的阴极.
增强的性能归因于异质瓦纳状态的协同效应,促进Zn2+运输并提供丰富的活性位点.
该研究提出了一个可行的策略,用于为下一代储能设备设计基于的先进电极材料.

关键词:

不同价值状态平衡的平衡.具有较高的特定容量.调节异质的.瓦纳-超分子花形材料的花形.离子电池离子电池

更多相关视频

A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery

A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery

Published on: February 13, 2017

Zinc-Sponge Battery Electrodes that Suppress Dendrites

Zinc-Sponge Battery Electrodes that Suppress Dendrites

Published on: September 29, 2020

相关概念视频

Valence Bond Theory

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

Metal-Ligand Bonds

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...

Ionic Crystal Structures

Ionic Crystal Structures

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...

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...

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...

Voltaic/Galvanic Cells

Voltaic/Galvanic Cells

Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...