化功能性电解质添加剂用于Li-CO2电池
Binbin Dan1, Linyue Li1, Shixuan Li1
1Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, P. R. China.
ACS applied materials & interfaces
|October 10, 2023
概括
功能性电解质添加剂可以提高Li-CO2电池的性能. 在CO2演变过程中,N-phenylpyrrolidine (PPD) 降低了充电潜力,而Br-PPD通过在阳极上形成保护性固体电解质介相 (SEI) 来提高循环稳定性.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 功能性电解质添加剂对于Li-CO2电池至关重要,影响CO2演变 (CO2ER) 和减少 (CO2RR) 反应.
- 现有的添加剂具有有限和多样化的功能,需要进一步研究它们的多重影响.
研究的目的:
- 为了研究功能性电解质添加剂在Li-CO2电池中的多重影响.
- 探索分子结构和添加剂的电化学性能之间的关系.
- 为了使可充电电池的新添加剂的有针对性的设计.
主要方法:
- 作为电解质添加剂,研究了N-phenylpyrrolidine (PPD) 和1-(3-bromophenyl) pyrrole (Br-PPD) 的作用.
- 评估了CO2ER充电潜力和Li的对称电池循环稳定性.
- 在金属阳极上分析了稳定的固体电解质介相 (SEI) 的形成.
主要成果:
- PPD将CO2ER的充电潜力降低到3.65V.
- 由于具有保护性的SEI,Br-PPD使Li能在Li电池中保持800小时的稳定循环.
- 基于Br-PPD的Li-CO2电池使用超级P阴极120个周期保持3.70V.
结论:
- 功能性电解质添加剂显著影响Li-CO2电池的性能.
- 有机分子的结构性质与它们的电化学应用有关.
- 这项研究为设计用于先进可充电电池的有效添加剂提供了洞察力.
相关概念视频
Ionic Bonding and Electron Transfer
41.7K
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.
41.7K
Batteries and Fuel Cells
27.6K
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...
27.6K
Acid Halides to Alcohols: LiAlH4 Reduction
2.9K
Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
2.9K
Halogens
18.5K
Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group.
18.5K
Alkyl Halides
16.7K
Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
16.7K
Lewis Acids and Bases
44.1K
In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
44.1K


