卡拉基南作为5V LiNi0.5 Mn1.5 O4 在离子电池中的阴极中的牺牲粘合剂
Barsa Chang1, Dae Hui Yun2, Insu Hwang1
1School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University, 1-Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea.
Advanced materials (Deerfield Beach, Fla.)
|July 19, 2023
概括
一种新型的牺牲性粘合剂,λ-carrageenan,通过稳定电极-电解质接口,提高了离子电池中5V级LiNi$_{0.5}$Mn$_{1.5}$O$_{4}$阴极性能. 这一突破改善了循环和速率的能力,克服了退化问题.
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
- 聚合物科学 聚合物科学
背景情况:
- 5V级LiNi$_{0.5}$Mn$_{1.5}$O$_{4}$ (LNMO) 由于其旋转结构,是离子电池的一个有前途的阴极材料.
- 高压运行LNMO导致界面降解和电解质分解,限制了电池的性能.
研究的目的:
- 为了克服LNMO阴极的界面不稳定性.
- 引入一种新的牺牲粘合剂,以提高电化学性能.
主要方法:
- 作为一种粘合剂,纳入了硫酸多糖体 λ-卡拉基 (CRN),作为一种粘合剂.
- 通过结和离子双极相互作用,研究CRN与LNMO表面的相互作用.
- 对阴极-电解质相间层组成的分析.
主要成果:
- CRN均地覆盖LNMO表面,形成含有LiSO$_{x}$F.的离子导电性阴极电解质相间层.
- 与传统的结合剂 (PVDF,藻酸盐) 相比,基于CRN的电极显示出明显优异的循环和速率性能.
结论:
- λ-carrageenan 作为一种有效的牺牲结合剂,增强了 LNMO 阴极的稳定性和性能.
- 该研究引入了一项新的策略,用于改进易受界面不稳定性的电池电极.
相关概念视频
Ionic Bonds
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 CompoundsIonic bonds are reversible electrostatic interactions between ions with...
Ionic Bonding and Electron Transfer
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.
Formation of Complex Ions
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...
Batteries and Fuel Cells
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...
Metal-Ligand Bonds
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...


