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Endowing CuTCNQ with a new role: a high-capacity cathode for K-ion batteries

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Abstract

Herein, copper-tetracyanoquinodimethane (CuTCNQ) with phase-I kinetics character has been proposed as an effective cathode for potassium-ion batteries. In a voltage range of 2–4.1 V (vs. K+/K), both cuprous cations (Cu+) and organic anions (TCNQ) are electrochemically active, and they render a three-electron redox mechanism, thereby enabling CuTCNQ to yield a high specific discharge capacity of 244 mA h g−1. Even after 50 cycles, the discharge capacity of 170 mA h g−1 is retained at 50 mA g−1. In addition, when the current density is elevated to 1000 mA g−1, the discharge capacity is still maintained at 125 mA h g−1. These test data are among the best results reported for high-potential cathodes of potassium-ion batteries.

Graphical abstract: Endowing CuTCNQ with a new role: a high-capacity cathode for K-ion batteries

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Publication details

The article was received on 30 Jan 2018, accepted on 01 May 2018 and first published on 02 May 2018


Article type: Communication
DOI: 10.1039/C8CC00802G
Citation: Chem. Commun., 2018, Advance Article
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    Endowing CuTCNQ with a new role: a high-capacity cathode for K-ion batteries

    J. Ma, E. Zhou, C. Fan, B. Wu, C. Li, Z. Lu and J. Li, Chem. Commun., 2018, Advance Article , DOI: 10.1039/C8CC00802G

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