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- Title
A Metal-Organic Compound as Cathode Material with Superhigh Capacity Achieved by Reversible Cationic and Anionic Redox Chemistry for High-Energy Sodium-Ion Batteries.
- Authors
Fang, Chun; Huang, Ying; Yuan, Lixia; Liu, Yaojun; Chen, Weilun; Huang, Yangyang; Chen, Kongyao; Han, Jiantao; Liu, Qingju; Huang, Yunhui
- Abstract
Although sodium-ion batteries (SIBs) are considered as alternatives to lithium-ion batteries (LIBs), the electrochemical performances, in particular the energy density, are much lower than LIBs. A metal-organic compound, cuprous 7,7,8,8-tetracyanoquinodimethane (CuTCNQ), is presented as a new kind of cathode material for SIBs. It consists of both cationic (CuII↔CuI) and anionic (TCNQ0↔TCNQ−↔ TCNQ2−) reversible redox reactions, delivering a discharge capacity as high as 255 mAh g−1 at a current density of 20 mA g−1. The synergistic effect of both redox-active metal cations and organic anions brings an electrochemical transfer of multiple electrons. The transformation of cupric ions to cuprous ions occurs at near 3.80 V vs. Na+/Na, while the full reduction of TCNQ0 to TCNQ− happens at 3.00-3.30 V. The remarkably high voltage is attributed to the strong inductive effect of the four cyano groups.
- Subjects
ORGANOMETALLIC compounds; QUINODIMETHANE; SODIUM ions; LITHIUM-ion batteries; PARTICLE physics; ENERGY density
- Publication
Angewandte Chemie, 2017, Vol 129, Issue 24, p6897
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201701213