Hybridization of lithium-ion batteries and electrochemical capacitors: fabrication and challenges

Richa Agrawal; Yong Hao; Yin Song; Chunhui Chen; Chunlei Wang

doi:10.1117/12.2180124

18 May 2015 Hybridization of lithium-ion batteries and electrochemical capacitors: fabrication and challenges

Richa Agrawal, Yong Hao, Yin Song, Chunhui Chen, Chunlei Wang

Proceedings Volume 9493, Energy Harvesting and Storage: Materials, Devices, and Applications VI; 94930B (2015) https://doi.org/10.1117/12.2180124
Event: SPIE Sensing Technology + Applications, 2015, Baltimore, MD, United States

Abstract

Conventional electrochemical double-layer capacitors (EDLCs) are well suited as power sources for devices that require large bursts of energy in short time periods. However, when compared to their battery counterparts, EDLCs suffer from low energy densities. The low energy density of EDLCs hinders their applications in devices that require a simultaneous supply of high power and high energy. In order to improve the energy density of EDLCs, the concept of hybridization of lithium-ion batteries (LIBs) and EDLCs has gathered much attention in past years. Such a hybrid is typically referred to as “lithium-ion capacitor” (LIC) or “lithium capacitor” and essentially utilizes a lithium intercalating anode (such as graphite or Li₄Ti₅O₁₂) and a fast charging-discharging EDLC electrode (such as activated carbon, carbon nanostructures) in a lithium-salt based electrolyte. Although such a system sounds quite ideal in theory, there are major challenges that need to be addressed in order to fully realize the benefits of LIB and EDLC electrodes in conjunction. Most of these challenges stem from the mismatch in capacity of the electrodes and also the charging-discharging times of the electrodes. For instance, the EDLC electrode acts as the limiting factor for the capacity of the system while the LIB electrode limits the power of the system. Here we have fabricated a hybrid capacitor that utilizes a Li₄Ti₅O₁₂ (LTO) based anode and an activated carbon (AC) composite based cathode. Half-cell testing for both LTO and AC have been shown along with full cell evaluation.

Citation Download Citation

Richa Agrawal, Yong Hao, Yin Song, Chunhui Chen, and Chunlei Wang "Hybridization of lithium-ion batteries and electrochemical capacitors: fabrication and challenges", Proc. SPIE 9493, Energy Harvesting and Storage: Materials, Devices, and Applications VI, 94930B (18 May 2015); https://doi.org/10.1117/12.2180124

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available