将金属协调聚合物转换为聚合离子液体改善了Li运输.
James T Bamford1,2, Leo W Gordon1,3, Raphaële J Clément1,3
1Materials Department, University of California, Santa Barbara, California 93106, United States.
ACS macro letters
|January 3, 2025
概括
四重化聚合物增强了先进电池的固体聚合物电解质 (SPEs) 中的离子 (Li+) 导电性. 这种修改改善了盐溶解和离子传输,与传统材料相比,导电率显著提高.
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
- 聚合物化学 聚合物化学
背景情况:
- 固体聚合物电解质 (SPEs) 为下一代离子 (Li+) 电池提供机械强度和降低可燃性.
- 传统的SPE在Li+导电性方面存在局限性,这阻碍了它们的广泛应用.
- 伊米达功能化聚合物 (PMS-Im) 是有前途的,但需要进一步优化以改善离子传输.
研究的目的:
- 研究聚合物四级化对盐溶解和SPE中的Li+运输的影响.
- 为了提高基于伊米达的聚合物的离子导电性,用于高性能Li+电池应用.
- 探索聚合物结构,离子运输机制和电池整体性能之间的关系.
主要方法:
- 通过PMS-Im.的四分化合成一种伊米达功能化聚合物 (PMS-Im+).
- +溶解特性和聚合物可塑化的表征.
- 测量离子导电性和分析Li +运输使用反向的海文比率.
主要成果:
- 将PMS-Im四级化为PMS-Im+显著改善了盐溶解和聚合物塑化.
- 逆避风港比率高达10表示正相关Li+运输,表明纳米通道透.
- 在90°C时,PMS-Im+实现了2.1 × 10^-5 S/cm的Li+导电性,比PMS-Im (1.6 × 10^-6 S/cm) 高出一个数量级.
结论:
- 四元化伊米达聚合物 (PMS-Im+) 是优越的固体聚合物电解质,与它们的伊米达对应物相比.
- 在PMS-Im+中增强的溶解和离子运输机制导致显著改善Li+导电性.
- 这些发现为开发高级离子电池的高性能SPE铺平了道路.
更多相关视频
11:04Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
12.9K
10:27Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides
Published on: July 14, 2015
10.0K
相关概念视频
02:51Metal-Ligand Bonds
20.5K
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...
20.5K
01:20Anionic Chain-Growth Polymerization: Overview
2.1K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.1K
00:56Extraction: Advanced Methods
409
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
409
01:04Anionic Chain-Growth Polymerization: Mechanism
2.0K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.0K
00:57Cationic Chain-Growth Polymerization: Mechanism
2.2K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.2K
01:17Ziegler–Natta Chain-Growth Polymerization: Overview
3.2K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.2K