| Autor: |
Qin, Tianfeng, Chen, Hao, Fang, Wenzhang, Cao, Guozhong, Gao, Chao |
| Zdroj: |
Journal of Materials Chemistry A; 11/14/2022, Vol. 10 Issue 42, p22605-22616, 12p |
| Abstrakt: |
Aqueous electrolytes are essential for ensuring safe and environmentally friendly energy storage devices. Low-concentration aqueous electrolytes exhibit narrow electrochemical stability windows (ESWs) of 1.23 V, but they have high ionic conductivities (∼125 mS cm−1). Contemporary methods use ultrahigh salt concentrations of 21–63 mol kg−1 (m), which can widen the ESWs (up to ∼3 V); however, they result in low ionic conductivities (10 mS cm−1). Achieving low-concentration aqueous electrolytes with wide ESWs and high ionic conductivities is challenging. Herein, we report a low-concentration aqueous electrolyte with a dual-network structure (2.11 m), a wide ESW of 4.6 V, and an ionic conductivity of 110 mS cm−1 at 25 °C. As a proof of concept, a 'poly(ion-water ligand) network' is designed to regulate the water properties of an 'ion/H2O-rich hydrogen-bond network' (low-concentration aqueous electrolyte). Supercapacitors as well as zinc-ion capacitors exhibit excellent cycling stabilities and high energy densities (∼29 W h kg−1 and ∼128 W h kg−1, respectively) within the operating voltage window (0–2.5 V). [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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