基于以太的弱溶解电解质能够快速充电和宽温度的离子电池
Zhicheng Wang1,2,3, Ran Han1, Dan Huang1,2
1i-lab, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences, Suzhou 215123, China.
ACS nano
|September 7, 2023
概括
环甲基以太 (CPME) 能够使离子电池在-60°C下稳定快充. 这种新的以太基电解质可以防止石墨电极问题,在极寒条件下提供高容量和长周期寿命.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 基于以太的电解质为快速充电和低温离子电池 (LIB) 提供了优势,因为粘度和点较低.
- 常见的以太溶剂会与石墨 (Gr) 阳极产生不可逆转的协同插曲,从而限制电池的性能.
研究的目的:
- 引入环甲基以太 (CPME) 作为LIBs的无协同干扰的以太溶剂.
- 使用CPME开发一种弱溶解电解质 (WSE),以提高低温性能.
主要方法:
- 研究了CPME的特性,包括其固态阻碍和广泛的液相温度范围.
- 用CPME和乙烯碳酸盐 (FEC) 辅溶剂配制了一个WSE.
- 在超低温度 (-60°C) 测试了具有WSE的Gr/Li半电池和LiFePO4/Gr袋式电池.
主要成果:
- CPME显示出较弱的溶解能力和广泛的液相温度范围 (-140至+106°C).
- 基于CPME的WSE实现了快速溶解,高离子导电性,并在Gr阳极上诱导了富含LiF的固体电解质介相 (SEI).
- Gr/Li 半电池具有较高的特定容量 (319 mAh g−1) 和在 -60 °C 稳定的循环.
- 在 -60°C下,LiFePO4/Gr袋式电池表现出极好的速率能力和超过1000个周期,高库伦比克效率 (≈99.9%) .
结论:
- CPME 是一种可行的无共间隔溶剂,用于先进的LIB电解质.
- 开发的WSE可实现高性能LIB,包括快速充电和在超低温下稳定运行.
- 这项研究突出了强大的低温电池应用的潜力.
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
13.0K
10:03Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
25.5K
相关概念视频
01:17Ion Exchange
620
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...
620
02:21Electrolyte and Nonelectrolyte Solutions
63.2K
Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
63.2K
03:13Intermolecular Forces
58.6K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
58.6K
00:42Ionic Bonds
118.6K
Overview
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 Compounds
Ionic bonds are reversible electrostatic interactions between ions...
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 Compounds
Ionic bonds are reversible electrostatic interactions between ions...
118.6K
02:48Ionic 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
01:09Ion-Exchange Chromatography
577
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...
577