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相关概念视频

Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

268
Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
268
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

632
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
632
Fast Decoupled and DC Powerflow01:24

Fast Decoupled and DC Powerflow

178
The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:
178
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

191
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
191

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相关实验视频

Updated: Jun 11, 2025

Identification and Quantification of Decomposition Mechanisms in Lithium-Ion Batteries; Input to Heat Flow Simulation for Modeling Thermal Runaway
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在离子电池中的交叉尺度解动态过程,使用了放松时间的多维分布.

Xue Cai1,2, Caiping Zhang1, Haijun Ruan3,4

  • 1National Active Distribution Network Technology Research Center, Beijing Jiaotong University, Beijing, 100044, China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|October 8, 2024
PubMed
概括
此摘要是机器生成的。

这项研究引入了一个新的框架,以准确诊断离子电池退化. 该方法增强了放松时间 (DRT) 分析的分布,以可靠地监测电池健康状况.

关键词:
跨尺度识别识别跨尺度识别放松时间的分布.运动过程解解.离子电池的离子电池重建的界面阻抗.

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The Effect of Charging and Discharging Lithium Iron Phosphate-graphite Cells at Different Temperatures on Degradation
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相关实验视频

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In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries
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科学领域:

  • 电化学 电化学 电化学
  • 材料科学 材料科学 材料科学
  • 电池技术 电池技术

背景情况:

  • 对离子电池 (LIB) 退化的非破坏性诊断对于可靠的操作至关重要.
  • 放松时间分布 (DRT) 是分析运动过程的强大工具,但在LIBs中因界面阻抗低而受到阻碍.
  • 现有的DRT方法对于复杂的LIB系统缺乏足够的解决方案和验证.

研究的目的:

  • 开发一个分层的分析框架,以提高时间表的解决方案,并减少DRT分析LIBs的不确定性.
  • 为了使LIBs中降解机制的可靠,非破坏性诊断成为可能.
  • 为了提高在LIBs中的动力过程解卷的准确性.

主要方法:

  • 使用高保真频域模型进行界面阻抗重建,以去除感应和扩散元件.
  • 多维DRT分析包括电荷状态 (SOC) 可逆性来解固体电解质介相 (SEI) 和电荷转移 (CT) 过程.
  • 基于SOC和温度变化的电极运动演变的表征.

主要成果:

  • 重建阻抗使得识别的时间常数的精度提高了约20%.
  • 交叉尺度DRT有效地区分了低SOC (10%以下) 和25°C的电极动力学,这是由于强大的阴极CT-SOC相关性.
  • 动力指标将阳极SEI或CT确定为不同电池中低温性能的独特速度限制步骤.

结论:

  • 拟议的层次框架显著提高了DRT用于LIB诊断的可靠性和准确性.
  • 该方法允许精确地解SEI和CT过程,提供对降解机制的洞察力.
  • 这项工作表明了对LIB动态演变和健康的非破坏性监测的有希望的方法.