An Energetic CuS-Cu Battery System Based on CuS Nanosheet Arrays.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33709698.
- Also identified by DOI 10.1021/acsnano.1c00075.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
The development of low-cost and high-energy aqueous battery technologies is of significance for renewable and stationary energy applications. However, this development has been bottlenecked by poor conductivity, low capacity, and limited cycling stability of existing electrode materials. In this work, we report on an energetic aqueous copper ion system based on CuS nanosheet arrays, taking profit of high conductivity of CuS and efficient charge carrier of copper ions. Electrochemical results reveal a high capacity of 510 mAh g<sup>-1</sup>, robust rate capability of 497 mAh g<sup>-1</sup> at a high rate of 7.5 A g<sup>-1</sup>, and ultrastable cycling by retaining 91% of the initial capacity over 2500 cycles. The charge-storage mechanism was systematically investigated by <i>ex situ</i> and <i>in situ</i> techniques involving a reversible transition from CuS to Cu<sub>7</sub>S<sub>4</sub> and to Cu<sub>2</sub>S through the redox of Cu<sup>2+</sup>/Cu<sup>+</sup>. Moreover, we demonstrate a hybrid ion battery consisting of CuS positive electrode and Zn negative electrode, which affords an energy and power of 286 Wh kg<sup>-1</sup> and 900 W kg<sup>-1</sup>, respectively, on the basis of both electrodes, exceeding many aqueous battery systems.