高容量转换型离子电池的多孔和无形MnMo3S13凝电极
Taohedul Islam1, Sahar Bayat2, Matthew A Wright3
1Department of Chemistry, Physics, and Atmospheric Sciences, Jackson State University, Jackson, Mississippi 39217, United States.
Journal of the American Chemical Society
|February 20, 2025
概括
研究人员开发了一种新型的硫化物凝,用于高容量的硫电池. 这种材料通过控制聚硫化物链并形成稳定的固体电解质介相来提高能量密度和循环稳定性.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 由于传统的正极材料,离子电池 (LIB) 的能量密度受到限制.
- 高能量密度的-硫 (Li-S) 电池提供了使用转化化学的有希望的替代方案.
- 电池的挑战包括实现高容量,可逆性,循环稳定性和管理体积变化.
研究的目的:
- 为高容量和循环稳定的Li-S电池开发一种新材料.
- 为了研究有孔,无形,硫化基MnMo3S13的结构和电化学特性.
主要方法:
- 在室温下通过溶液处理合成MnMo3S13.
- 使用同步射线对分布函数 (PDF) 和扩展射线吸收细结构 (EXAFS) 的表征.
- 在Li/Mn0.25Mo3S13半细胞中进行电化学测试,并使用放松时间分布 (DRT) 进行分析.
主要成果:
- Mn0.25Mo3S13凝具有一个结构,Mn2+集成到Mo3S13矩阵中.
- 初始分子动力学 (AIMD) 模拟显示Mn2+的结合缩短了多硫化物链.
- 一个Li/Mn0.25Mo3S13半电池实现了897 mAh g-1的初始容量,并在C/3的100个周期后保留了571 mAh g-1.
结论:
- Mn0.25Mo3S13凝显示了Li-S电池的高容量和循环稳定性.
- 稳定的固体电解质间相 (SEI) 形成有助于电荷-放电可逆性.
- 通过较短的多硫化物链和对多硫化物的Mn2+亲和力来减少活性质溶解,提高了性能.
相关概念视频
Ion Exchange
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 basic...
Schottky Barrier Diode
Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
MOS Capacitor
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...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
MOSFET: Depletion Mode
Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity arises...
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity arises...
Types of Reversible Electrodes
For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...
The Electrical Double Layer
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...


