Related Experiment Video
Updated: Sep 18, 2025
08:06
Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
Published on: February 23, 2017
8.6K
Continuously Alternating Storage of Anion and Cation Toward a High-Performance Bipolar Conjugated Polymer Cathode
Lian-Wei Luo1,2, Wenyan Ma1, Siteng Zhu1
1Key Laboratory of Flexible Optoelectronic Materials and Technology (Jianghan University), Ministry of Education, School of Optoelectronic Materials & Technology, Jianghan University, Wuhan, 430056, P. R. China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|June 23, 2025
Summary
This study introduces a new organic electrode material that stores both anions and cations, overcoming limitations in aluminum battery performance. This breakthrough enables faster charging and longer battery life for advanced energy storage applications.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Chemistry
Background:
- Single-host organic electrodes face challenges with rapid ion insertion due to Coulomb repulsion, limiting capacity and rate performance.
- This conflict hinders the development of high-performance energy storage devices.
Purpose of the Study:
- To design and synthesize a bipolar conjugated donor-acceptor (D-A) polymer for efficient co-storage of opposite ions.
- To investigate the electrochemical performance of this new material in aluminum batteries.
Main Methods:
- Synthesis of a D-A polymer (PTZ-Pz) using phenothiazine (donor) and phenazine (acceptor) units.
- Electrochemical testing to evaluate specific capacity, rate performance, and cyclability.
Main Results:
- The PTZ-Pz polymer demonstrated a high specific capacity of 208 mAh g-1.
- Achieved ultra-long cyclability (>80,000 cycles) and excellent rate performance (116 mAh g-1 at 20 A g-1).
- The material operated effectively at a high mass loading of 44.2 mg cm-2.
Conclusions:
- The D-A polymer facilitates charge transfer and accelerates reaction dynamics through alternate anion and cation storage.
- This approach enhances energy and power density, paving the way for novel aluminum battery electrode materials.
Related Concept Videos
01:17Ion Exchange
669
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...
669
00:57Cationic Chain-Growth Polymerization: Mechanism
2.4K
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...
2.4K
01:04Anionic Chain-Growth Polymerization: Mechanism
2.1K
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...
2.1K
01:25MOS Capacitor
998
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
998
01:20Anionic Chain-Growth Polymerization: Overview
2.2K
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,...
2.2K
03:12Batteries and Fuel Cells
28.0K
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...
28.0K