优化离子电池电解质设计的大小诱导高效应
Xiaoyan Wang1, Chaoyuan Ji2, Huiqin Chen1
1Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan, 430072, China.
Advanced materials (Deerfield Beach, Fla.)
|August 28, 2025
概括
开发了一种新型大小诱导的高电解质 (SHEE),提高了离子电池的性能. 这种先进的电解质提供了更好的导电性和稳定性,
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 高能离子电池 (LIB) 的电解质设计至关重要,在平衡导电性和稳定性方面面临挑战.
- 增加电解质提供了一种提高离子导电性的途径,而不会损害电化学稳定性.
研究的目的:
- 为了设计先进的LIB电解质,研究大小诱导的高效应.
- 开发和评估一种新的小型高电解质 (SHEE),以提高电池性能,特别是在低温下.
主要方法:
- 开发了一种使用小尺寸的高电解质 (SHEE).
- 描述了电解质的特性,包括配置,+溶解,结点和离子导电性.
- 在包括超低温度在内的各种条件下测试了NCM811液晶电池和NCM811石墨袋电池.
主要成果:
- SHEE表现出增强的配置多样性和,导致较小的Li+溶解集群和较低的点 (-96.6 °C).
- 与传统电解质相比,在-60°C达到三倍的离子导电性,改善了可湿性,并促进了Li+解离.
- 在光NCM811电池中显示出卓越的循环稳定性 (2000个循环,0.0162%/循环衰变在10°C) 和优异的低温速率能力 (84.3%在-60°C保持).
结论:
- 大小诱导的高设计策略对于在极端温度下产生性能优越的电解质是有效的.
- SHEE 能够实现均的沉积和强大的阴极电解质间相 (CEI) 形成,这对于电池的寿命至关重要.
- 开发的SHEE可用于在苛刻环境条件下运行的LIB.
相关概念视频
01:19Ionic Strength: Effects on Chemical Equilibria
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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...
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02:54Trends in Lattice Energy: Ion Size and Charge
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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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03:08Electrolytes: van't Hoff Factor
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Colligative Properties of Electrolytes
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
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02:48Ionic Bonding and Electron Transfer
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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.
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03:24Common Ion Effect
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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02:21Electrolyte and Nonelectrolyte Solutions
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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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