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相关概念视频

Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

663
Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
663
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
1.6K
Potentiometry: Overview01:06

Potentiometry: Overview

4.2K
Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as...
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Standard Electrode Potentials03:02

Standard Electrode Potentials

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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
49.9K
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

1.9K
Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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在全聚合体固体电解质中以宏观方式排序的压力电位,以响应阳极的体积变化,以抑制树突.

Shuang-Feng Li1, Min Zuo1, Jia-Ming Wang1

  • 1Guangdong Provincial Key Laboratory of New Energy Materials Service Safety, Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|October 13, 2025
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概括

设计的压电聚合物纳米纤维可以创建定向电场来引导沉积,防止固态电池中的树生长,并提高稳定性.

关键词:
阳极的体积变化所有聚合物固体电解质的电解质.的树突是的树突.宏观上有序的压力电位.

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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
  • 聚合物科学 聚合物科学

背景情况:

  • 固态聚合物电解质 (SPEs) 提高了金属电池的安全性,但由于阳极体积的变化而与树突石的形成作斗争.
  • 树突是下一代电池的主要安全性和性能问题.

研究的目的:

  • 开发一种新的策略,以抑制固态电池中的树生长.
  • 研究由压电聚合物产生的定向电场在控制沉积中的作用.

主要方法:

  • 制造具有对齐双极的压电聚乙烯-协同三乙烯 (P) [P (VDF-TrFE) ]纳米纤维接口.
  • 产生的电场的特征及其对Li+迁移和沉积的影响.
  • 对称Li电池和LiNi0.8Co0.1Mn0.1O2 (NCM811)//Li全电池的稳定性和循环性能的测试.

主要成果:

  • 压电P ((VDF-TrFE) 间相产生了一个定向电场,引导Li+从树尖端沉积到平面区域.
  • 实现了高离子导电性 (5.0 × 10-4 S cm-1) 和 Li+ 转移数 (0.40).
  • 对称Li细胞表现出3000小时的稳定性,全细胞在400个循环后保持96%的容量. 逆转场方向可以使这些改进无效.

结论:

  • 在聚合物界面中以定向工程设计的压电场对于有效的树抑制至关重要.
  • 这种方法为提高金属固态电池的安全性和性能提供了新的途径.
  • 该研究强调了控制电池应用中的压电场方向的重要性.