具有增强的积极温度系数效应的聚3-基烯的分子工程,用于内在安全的离子电池
Hao Chen1, Sicheng Miao1, Hui Li2
1College of Chemistry and Molecular Sciences, Hubei Key Laboratory of Electrochemical Power Sources, Wuhan University, Wuhan, 430072, China.
聚3-基烯 (P3AT) 通过抑制热失控,为离子电池 (LIB) 提供热安全性. 定制P3AT侧链和剂优化了它们的正温度系数 (PTC) 效应,以获得更安全的电池电极.
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:
- 高能量密度的离子电池 (LIB) 面临着热安全挑战.
- 聚3-基烯 (P3ATs) 具有正温度系数 (PTC) 效应,对于热失控抑制至关重要.
- 了解P3ATs对PTC行为的结构-属性关系是必不可少的.
研究的目的:
- 用量身定制的基侧链合成P3AT.
- 为了研究各种阴离子剂对P3AT PTC特性的影响.
- 为热保护性电池材料建立分子设计原则.
主要方法:
- 系统合成具有多种基侧链的P3ATs.
- 对PTC过渡温度和电阻比率的阳离子剂效应 (PF6,TFSI,ClO4) 的研究.
- 在110°C时对基于LiFePO4的温度敏感电极 (LFP-P3AT) 的评估.
主要成果:
- 较长的基侧链和较小的剂离子降低了PTC过渡温度并增加了阻力比率.
- 增强的链路流动性和多邦分离效率与改善的PTC行为相关.
- P3ATs显示部分PTC可逆性,但热循环和较长的侧链加速降解.
结论:
- 考虑到基链长度和剂类型的P3ATs的分子设计是可调节的PTC特性的关键.
- 可以将P3AT集成到LiFePO4电极中,以在特定温度下进行有效的热关闭.
- 这项研究为开发内在安全的智能电池材料提供了基本原则.
更多相关视频
08:59Concurrent Quantitative Conductivity and Mechanical Properties Measurements of Organic Photovoltaic Materials using AFM
Published on: January 23, 2013
11:04Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
相关概念视频
π Molecular Orbitals of 1,3-Butadiene
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
Thermal and Photochemical Electrocyclic Reactions: Overview
Thermal Electrocyclic Reactions: Stereochemistry
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.
Radical Chain-Growth Polymerization: Overview
Anionic Chain-Growth Polymerization: Overview
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)
