了解长寿命离子电池的含聚离子材料的支柱化学
Wenyi Liu1,2, Wenjun Cui1, Chengjun Yi2
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, P. R. China.
Nature communications
|November 14, 2024
概括
含的聚离子化合物对离子电池具有前景. 一个新的支柱效应稳定了结构,使得超过10,000个循环,最小的体积变化.
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
- 固态化学 固态化学
背景情况:
- 含的聚离子化合物由于其离子运输通道和稳定的框架,为离子电池提供了潜力.
- 这些材料中的储存机制和行为在很大程度上仍未得到研究.
研究的目的:
- 为了全面揭示含有K的聚离子化合物的离子 (Na+) 储存机制.
- 阐明剩余离子 (K+) 在储存期间稳定宿主结构中的作用.
主要方法:
- 使用KTiOPO4薄膜模型进行无干扰研究.
- 用于in situ/operando光谱学,偏差校正电子显微镜和密度函数理论 (DFT) 计算.
- 研究了粉末电极和准固态囊细胞的结构和电化学性能.
主要成果:
- 发现不完整的K+/Na+离子交换,其余的K+离子作为稳定道结构的支柱.
- 与纯K+或Na+插入相比,观察到显著减少体积变化 (3.9%),导致异常的循环稳定性 (10,000个循环).
- 在粉末电极中实现了2.47 mAh cm-2的商业级面积容量,并在准固态袋式电池中证明了长期稳定性.
结论:
- 剩余的K+离子的"支柱效应"对于保持结构完整性和使离子电池能够长期循环至关重要.
- 这一发现为设计高性能金属离子电池材料提供了新的策略,通过结合异质.
- 这项研究激发了未来对金属离子储存在混合阴离子组成的主体材料的研究.
相关概念视频
03:06Alkali Metals
19.1K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
19.1K
01:19Ionic Strength: Effects on Chemical Equilibria
1.4K
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...
1.4K
03:00Electrolysis
26.0K
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...
26.0K
00:42Ionic Bonds
118.0K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
118.0K
02:54Classification of Elements and Compounds
66.4K
Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond. Elements are classified as atomic or molecular based on the nature of their basic units.
Compounds are pure substances composed of two or more elements in fixed, definite proportions. Compounds are classified as ionic or molecular (covalent) based on the bonds...
Compounds are pure substances composed of two or more elements in fixed, definite proportions. Compounds are classified as ionic or molecular (covalent) based on the bonds...
66.4K
02:54Ions as Acids and Bases
23.6K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
23.6K