高压和长寿命离子电池的阴离子氧化转化使渐变相间工程成为可能
Baodan Zhang1,2, Xiaohong Wu3, Haiyan Luo1
1State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China.
Journal of the American Chemical Society
|February 12, 2024
概括
研究人员开发了一种用于高能离子电池的新渐变阴极电解质介面 (CEI). 这种工程接口提高了丰富的阴极的稳定性和循环性能,为先进的可充电电池铺平了道路.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 丰富的阴极中的离子氧化还原反应 (ARR) 为下一代电池提供了高能量密度.
- 由于复杂的ARR机制,如核友性攻击,阴极-电解质间相 (CEI) 的不稳定性是丰富阴极的一个主要挑战.
- 现有的高压阴极面临CEI稳定性问题,在丰富的系统中,这种问题更加严重.
研究的目的:
- 通过操纵界面反应,在丰富的阴极上设计一个稳定且功能性的CEI.
- 为了利用核友的攻击, 通常是有害的, 建设性的CEI形成.
- 提高丰富电池阴极的电化学性能和循环寿命.
主要方法:
- 引入一个全的电解质与核友攻击相互作用.
- 在丰富的正极表面上构建具有明显化层的梯度CEI.
- 形成基于LiF的外罩和化聚合物内罩,以提供强大的相间保护.
主要成果:
- 在丰富的阴极上实现了梯度CEI和增强的界面稳定性.
- 将有害的核友电解质分解转化为有益的CEI制造工艺.
- 在800个循环后,丰富阴极的容量保留率从43%提高到71%.
- 在没有阳极的全细胞中表现出优异的循环稳定性 (在220个循环中保持98. 8%).
结论:
- 梯度CEI工程有效地稳定丰富的阴极,通过减轻与离子氧化还原反应相关的问题.
- 开发的接口策略提高了电池循环寿命和能量密度,这对于实际应用至关重要.
- 这种方法为开发先进的高能充电电池提供了有前途的途径.
更多相关视频
相关概念视频
Batteries and Fuel Cells
27.4K
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...
27.4K
Ion Exchange
592
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...
592
Electrolysis
26.4K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
26.4K
Voltaic/Galvanic Cells
57.2K
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
57.2K
Ion-Exchange Chromatography
492
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
492


