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相关概念视频

Types of Reversible Electrodes01:24

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...

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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为硬碳阳极预工程人工固体电解质介面,以获得优越的储能性能.

Lu Shi1, Yadi Sun1, Wei Liu1

  • 1Institute of Intelligent Flexible Mechatronics & School of Mechanical Engineering, Jiangsu University, Zhenjiang, 212013, China.

Chemical communications (Cambridge, England)
|October 6, 2023
PubMed
概括

研究人员设计了一个5纳米的人工固体电解质接口 (SEI),用于离子电池中的硬碳阳极. 这一创新显著提高了库伦比克的初始效率,并提高了长期的自行车稳定性和速度性能.

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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
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 离子电池 (SIB) 是离子电池的有希望的替代品,因为的丰富含量.
  • 硬碳阳极在SIB中广泛使用,但最初的库伦比效率低,容量下降.
  • 稳定的固体电解质接口 (SEI) 的形成对阳极性能至关重要.

研究的目的:

  • 为离子电池中的硬碳阳极设计一个稳定的人工固体电解质接口 (SEI).
  • 评估人工SEI对硬碳阳极电化学性能的影响.
  • 为了提高离子电池的初始库伦比克效率和循环稳定性.

主要方法:

  • 在硬碳阳极上制造5纳米厚的人工SEI层.
  • 使用静电循环,循环电压测量和电化学阻抗光谱的电化学表征.
  • 根据各种C率和周期号进行性能评估.

主要成果:

  • 人工SEI显著提高了最初的库伦比克效率,达到94%.
  • 经过修改的硬碳阳极表现出优越的速率性能,在800个循环后在1°C下保持247 mA hg-1 .
  • 观察到卓越的循环稳定性,在400个循环后在6°C下可逆容量为220mA hg-1 .

结论:

  • 工程人工SEI有效地稳定了硬碳阳极表面.
  • 人工SEI是一种可行的策略,可以提高离子电池的性能.
  • 这种方法为实现实用和高性能离子储能系统提供了一条途径.