相关实验视频
Updated: Jun 16, 2026
07:23
Construction and Testing of Coin Cells of Lithium Ion Batteries
Published on: August 2, 2012
31.6K
一个LiNiCoMnO2阴极的状分子涂层,用于高速容量的离子电池
Nir Yuran1, Bagavathi Muniyandi2, Arka Saha2
1Department of Applied Physics, Center for Nanoscience and Nanotechnology, Hebrew University of Jerusalem, Jerusalem 91904, Israel.
The journal of physical chemistry letters
|March 1, 2024
概括
研究人员使用简单的聚氨酸性分子涂层增强了富含的离子电池阴极. 这种涂层提高了排放能力和速度性能,为储能解决方案提供了有前途的进步.
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
- 纳米技术纳米技术
背景情况:
- 不断增长的能源需求需要先进的电池存储解决方案.
- 富含的分层过渡金属氧化物 (NCM) 是离子电池的有希望的阴极材料,因为其高特异性容量和工作电压.
- 像NCM811和NCM622这样的丰富的阴极在性能和稳定性方面面临挑战.
研究的目的:
- 为了研究聚氨酸奇拉分子涂层对丰富的NCM阴极材料性能的影响.
- 探讨在改善电极接口特性方面,奇拉诱导自旋选择性 (CISS) 效应的潜力.
- 为了提高NCM阴极的放电能力,速率能力和电压稳定性.
主要方法:
- 涂层 富含Ni的NCM (NCM811和NCM622) 阴极材料,含有薄层聚氨酸奇拉分子.
- 电化学表征包括循环电压测量,静电电荷-放电循环和电化学阻抗光谱学.
- 分析电极-电解质接口和电荷转移电阻.
主要成果:
- 基拉尔聚氨酸涂层显著提高NCM811和NCM622电极的放电能力和速率能力.
- 涂层电极表现出降低的电压歇斯底里和提高的速率性能,在4C放电速率下,容量增加了10%以上.
- 被认定为机理的作用是基拉性诱导的旋转选择性效应,通过对齐电子旋转来降低界面电阻和超电位.
结论:
- 一种简单的聚氨酸奇拉分子涂层是一种有效的策略,可以提高富含Ni的NCM阴极的电化学性能.
- CISS效应为优化电极接口和提高离子电池性能提供了一条新的途径.
- 这种方法为开发下一代高性能储能设备提供了一个有前途的途径.
相关概念视频
03:12Batteries 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...
01:08Electrodeposition
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
01:25MOS 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...
01:30The 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...