AI Article Synopsis
- Cholinium chloride (5 mol/kg) is a cost-effective and eco-friendly electrolyte solution that allows carbon/carbon supercapacitors (SCs) to operate efficiently down to -40°C, boasting a neutral pH of 6.1 and high conductivity (88 mS/cm at 24°C).
- The supercapacitors achieve impressive performance with a capacitance of 126 F/g and maintain a long lifespan at voltages up to 1.5 V, even at low temperatures where capacitance only slightly drops to 106 F/g and exhibits minimal ohmic losses.
- Unlike traditional electrolytes that require antifreezing additives, the cholinium salt solution addresses issues of low solubility and
Article Abstract
Cholinium chloride at a concentration of 5 mol kg in water is proposed as a low-cost and environmentally friendly aqueous electrolyte, enabling extension of the operating range of carbon/carbon supercapacitors (SCs) down to -40 °C. This solution has a pH close to neutrality (pH 6.1) and high conductivity of 88 mS cm at 24 °C. The supercapacitors demonstrate a high capacitance of 126 F g (per mass of one electrode) and long life span at voltages up to 1.5 V. At -40 °C, the carbon/carbon SCs display excellent electrochemical characteristics with only slightly reduced capacitance of 106 F g and negligible ohmic losses. As compared to previous works, where antifreezing additives were introduced in traditional neutral electrolytes, the low solubility of the salt and related poor conductivity of the solution is no longer an issue, which makes cholinium salt aqueous solutions very promising for SCs operating at sub-ambient temperature conditions.
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| http://dx.doi.org/10.1002/cssc.201701957 | DOI Listing |
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