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

Endowing CuTCNQ with a new role: a high-capacity cathode for K-ion batteries. Chem Commun (Camb). 2018 May 16;: Authors: Ma J, Zhou E, Fan C, Wu B, Li C, Lu ZH, Li J 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. PMID: 29766154 [PubMed - as supplied by publisher]
Source: Chemical Communications - Category: Chemistry Authors: Tags: Chem Commun (Camb) Source Type: research