提高硫电池的阴极活性和阳极稳定性,使用酸盐触发的强物种
Pengfei Jia1, Jin Wang1, Tianle Zheng2,3
1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China.
Angewandte Chemie (International ed. in English)
|February 23, 2024
概括
这项研究引入了一种用于硫 (Li-S) 电池的新型电解质添加剂. 该添加剂同时增强了硫阴极活动,并使阳极复苏,克服了实际Li-S电池应用的关键挑战.
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:
- 硫 (Li-S) 电池具有高的理论能量密度,但面临着诸如阴极电荷转移缓慢和阳极降解等挑战.
- 现有的Li-S电池系统需要先进的电解质解决方案来提高性能和循环寿命.
研究的目的:
- 开发一种先进的电解质添加剂,同时解决 Li-S 电池中的阴极和阳极问题.
- 为了提高硫的利用率和阳极的稳定性,用于实际的Li-S电池应用.
主要方法:
- 在极性电解质中采用了使用I2-LiNO3的新型电解质添加剂策略.
- 为了了解添加剂的机制,进行了in situ/ex situ光谱和形态分析.
- 组装和测试了对称的LiLi细胞和Li-S细胞,以评估性能指标.
主要成果:
- 添加剂触发了I3-/IO3-物种,这些物种有效地与隔热Li2S反应,并使不活跃的再生.
- 促进了Li2S解离,并抑制了树突性的生长,显著改善了Li阳极的稳定性.
- 对称的Li-S电池实现了4000小时的寿命,具有较低的超电位;Li-S电池显示了100%的容量保留和增强的速率能力.
结论:
- 开发的电解质添加剂策略有效地提高了硫活性,并使Li-S电池中的死再生.
- 这项工作通过电解质工程提出了一种可行的方法,用于先进的Li-S电池技术的实际应用.
相关概念视频
Formation of Complex Ions
23.6K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.6K
Ionic Strength: Effects on Chemical Equilibria
1.5K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
1.5K
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
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
Electrodeposition
633
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...
633
Ionic Bonding and Electron Transfer
41.6K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
41.6K


