In:
Angewandte Chemie, Wiley, Vol. 129, No. 24 ( 2017-06-06), p. 6897-6901
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 (Cu II ↔Cu I ) and anionic (TCNQ 0 ↔TCNQ − ↔ TCNQ 2− ) 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 TCNQ 0 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.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v129.24
DOI:
10.1002/ange.201701213
Language:
English
Publisher:
Wiley
Publication Date:
2017
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