Standards Development

Scope

This part of IEC TS 62607 establishes standardized methods to determine the electrochemical key control characteristics, including

• specific capacitance, internal resistance, leakage current, voltage maintenance, endurance in cycling and temperature endurance of carbon nanomaterials by

• determining the standard coin cell EDLC. The electrochemical key control characteristics are derived by calculation the recording curve at the specific charging and discharging process.

- The document is applicable for coin cell EDLC assembled from carbon nanomaterials, such as nanoporous activated carbon, carbon aerogel, carbon nanotube, carbon black, graphene, nano graphite sheet, vapor-grown carbon fibre and so on.

- Typical application areas of this method are resea rch, manufacturer and downstream user to guide material processing and quality control.

Purpose

Electrochemical capacitors are wildly used in the fields of electric vehicles, high speed trains, airplane, photovoltaic, wind powder and electronics, due to their ultra -fast charge/discharge capability, long cycle life, wide working temperature range, hig h security reliability and low maintenance cost. Electric double layer capacitor (EDLC) is a kind of the electrochemical capacitor. The mechanism of energy storage for EDLCs is reversible ion adsorption at the active material - electrolyte interface. Therefore, large specific surface materials, like nanoporous carbon material, are often used as the active material in EDLC. In addition, to improve the conductivity of the electrode, high conductivity materials, like carbon black, graphene and CNTs are used as t he conductor in the EDLC. Therefore, carbon nanomaterials play an irreplaceable and important role in EDLC, and directly determine the electrochemical performance of the EDLCs.

The electrochemical performance of the carbon nanomaterial used in EDLC is cha racterized based on the assembled device, like coin cell EDLC, three-electrode cell EDLC or cylindrical cell EDLC. The method of coin cell is featured with low cost, flexible, highly efficient, and is widely adopted by the academia and industry.

This IEC Technical Specification introduces standard methods to determine the electrochemical key control characteristics of the carbon nanomaterial based on the coin cell EDLC.