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相关概念视频

Ionic Bonding and Electron Transfer02:48

Ionic 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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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Ion Exchange01:17

Ion Exchange

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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
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.0K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

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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...
496
Batteries and Fuel Cells03:12

Batteries and Fuel Cells

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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...
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Preparation of Graphene Liquid Cells for the Observation of Lithium-ion Battery Material
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自终止的,异质的固体电解质介相能够在石墨阳极中实现可逆的乙烯共接.

Dawei Xia1, Heonjae Jeong2,3,4, Dewen Hou5,6

  • 1Department of Chemistry, Virginia Tech, Blacksburg, VA 24061.

Proceedings of the National Academy of Sciences of the United States of America
|January 23, 2024
PubMed
概括

研究人员使用以太溶剂和盐开发了离子电池的新型电解质,在石墨阳极中实现了高效率和稳定性. 这一突破使得可逆的溶剂共,克服先前的先进电池应用的局限性.

关键词:
离子电池是一种离子电池.它们是共插曲的共插曲.乙太电解质是以太的电解质.石墨阳极是一种石墨阳极.固体-电解质相间阶段

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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
  • 电池技术 电池技术

背景情况:

  • 乙溶剂适用于Na-ion和K-ion电池,但历史上在离子电池中会导致石墨剥落.
  • 开发稳定的离子电池电解质对于高性能储能至关重要.

研究的目的:

  • 为了在石墨中实现可逆的溶剂协同干扰,使用离子电池的以太基电解质.
  • 为了克服石墨脱皮和与以太电解质相关的细胞衰竭的历史挑战.

主要方法:

  • 一种新型电解质的设计和配方:1M LiBF4 在1,2-dimethoxyethane (G1) 中.
  • 用开发的电解质对天然石墨阳极进行电化学测试.
  • 使用各种技术,包括同步子分析,对固体电解质介相 (SEI) 的表征.
  • 使用ab initio分子动力学 (AIMD) 模拟的计算建模.

主要成果:

  • 设计的电解质 (1M LiBF4 in G1) 使得天然石墨可以达到~91%的初始库伦比克效率和400个循环后>88%的容量保留.
  • 在石墨边缘平面上形成了一个自我终结的,粒状的,化伪SEI,减轻了剥皮.
  • AIMD模拟揭示了伪SEI的分子起源,操作同步仪分析证实了可逆石墨相变.

结论:

  • 证明了极端条件电池在石墨中共化学的可行性.
  • 使用以太电解质在石墨中进行可逆的Li-溶剂协同干扰的既定策略.
  • 提供了理解和控制各种电池系统中相间形成的基础.