Superior Multielectron-Transferring Energy Storage by π-d Conjugated Frameworks
Dong Xia1, Ken Sakaushi1, Andrey Lyalin1,2
1Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.
Small (Weinheim an Der Bergstrasse, Germany)
|June 29, 2022
Summary
New bis(diimino)copper frameworks achieve high multielectron transfer (eM = 3.5) for advanced energy storage. This design utilizes abundant elements and reversible cation-nitrogen bond rearrangements for improved electrode performance.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Reversible multielectron-transfer materials are crucial for boosting energy density in electrochemical energy storage.
- Current oxide-based materials have limitations, including degradation and reliance on precious metals (e.g., Ir, Ru).
- Non-oxide materials with abundant elements offer a promising alternative for advanced energy storage.
Purpose of the Study:
- To design and investigate non-oxide-based reversible multielectron-transfer materials.
- To explore the role of cation-anion interactions in multielectron-transfer mechanisms.
- To develop affordable electrode materials for enhanced electrochemical energy storage.
Main Methods:
- Utilized a combination of experimental and theoretical approaches.
- Investigated model non-oxide electrode systems with varying metal-nitrogen bonds.
- Analyzed bis(diimino)copper frameworks for their electrochemical properties.
Main Results:
- Demonstrated a bis(diimino)copper framework with an electron-transfer number per metal-cation (eM) of 3.5.
- Observed a cation/anion co-redox mechanism alongside a dual-ion mechanism.
- Identified unique reversible rearrangement of Cu-nitrogen bonds upon lithium intercalation, enabling significant multielectron transfer.
Conclusions:
- The study presents a novel strategy for designing affordable multielectron-transfer electrodes.
- Bis(diimino)copper frameworks offer tunable π-d conjugated electronic structures for designer multielectron transfer.
- This research provides new insights into advancing electrochemical energy storage reactions through non-oxide materials.
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