2025-08-22 産業技術総合研究所
＜関連情報＞
- https://www.aist.go.jp/aist_j/press_release/pr2025/pr20250822/pr20250822.html
- https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/cssc.202500785
有機電池電極における荷電キャリアとして、分子アニオンはリチウムイオンよりも速く移動する：2,6-ビス(ジフェニルアミノ)アントラキノンからの洞察 Molecular Anions Move Faster than Lithium Ions as Charge Carriers in the Organic Battery Electrodes: Insights from 2,6-Bis(diphenylamino)anthraquinone
Hikaru Sano, Aya Yoshimura, Masaki Sawada, Tatsuo Noda, Yohji Misaki, Masaru Yao
ChemSusChem Published: 28 July 2025
DOI:https://doi.org/10.1002/cssc.202500785
Graphical Abstract
The suitability of molecular anions and lithium cations as carrier ions for use with organic battery materials is compared. The findings reveal that molecular anions move faster than lithium ions, suggesting that anion-based batteries may offer superior rate-performance. This discovery highlights the advantages of anion transport in battery technology, paving the way for more efficient and effective energy storage solutions.
Abstract
In view of the growing demand for sustainable energy storage solutions, the potential of secondary batteries is being focused on. Lithium-ion batteries often rely on cathode materials containing scarce rare metals. Therefore, reducing the amount of these metals in the cathode materials or developing alternatives is crucial. Minor-metal-free organic materials with redox activity are promising alternatives. Some organic compounds have moieties allowing the insertion and deinsertion of cations as well as anions during charging and discharging cycles. This study aims to determine if the insertion and deinsertion of monatomic cations or molecular anions offer superior rate performance in organic materials. We are focusing on 2,6-bis(diphenylamino)anthraquinone, which, after in-cell polymerization, accommodates the insertion and deinsertion of both cations (Li+) and anions (PF6−). The investigation of the reaction rates for each ion reveals that molecular anions move faster than monatomic lithium-ions as charge carriers in the organic battery electrodes. The findings provide insights into the ion dynamics within organic electrode materials as well as shed light on anion batteries, which outperform cation batteries, such as lithium-ion batteries.
