On the utilisation of the pseudo-capacitive capabilities of Li-ion cells for the provision of frequency response services
| Autor: | Maria Brucoli, David Greenwood, Rohit Bhagat, Tazdin Amietszajew, Martin Rogall |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Battery (electricity)
Frequency response Materials science Renewable Energy Sustainability and the Environment business.industry 020209 energy Capacitive sensing TK Energy Engineering and Power Technology 02 engineering and technology 021001 nanoscience & nanotechnology Capacitance Dielectric spectroscopy Power (physics) State of charge 0202 electrical engineering electronic engineering information engineering Optoelectronics Electrical and Electronic Engineering Diffusion (business) 0210 nano-technology business |
| ISSN: | 2352-152X |
| Popis: | This work investigates the capacitive capabilities of Li-ion pouch and cylindrical cells in respect to the provision of Frequency Response services and a potential for reduction in battery ageing effects. This is achieved using Electrochemical Impedance Spectroscopy (EIS) and a novel method of identifying and defining the threshold frequency between pseudo-capacitive and diffusion processes of the cell. It is found that this threshold frequency is independent of current intensity up to 1 C, showing that even at high power, pseudo-capacitance has significant impact. However, a severe dependency upon relative cell surface area and State of Charge (SoC) is identified. Symmetrical charge-discharge pulses of up to 10 s utilise primarily cell capacitance. Literature indicates, that this level of utilisation reduces the electrochemical ageing impact significantly. This article displays a method to identify and isolate these processes for any given cell and to allow enhancement of conventional ageing modelling. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect