Voltage characteristics and capacitance balancing for Li4Ti 5O12/activated carbon hybrid capacitors

Jeong Jin Yang, Chang Hae Choi, Hyun Bum Seo, Han Joo Kim, Soo Gil Park

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Asymmetric hybrid capacitors comprising an activated carbon (AC) positive electrode and a Li4Ti5O12 (LTO) negative electrode can achieve much higher energy density than conventional electric double layer capacitors. However, when operated at 3 V, the positive electrode develops an over-potential, leading to gas generation. Here, we investigated the feasibility of realizing a stable potential at the positive electrode using capacitance balancing. The voltage characteristics of the positive and negative electrodes were measured using a three-electrode system. The linear relationship between the potential and capacitance of the AC electrode was used to balance the capacitances of the two electrodes. Thus, stable operation and enhanced specific capacity were obtained at an operation voltage of 3 V.

Original languageEnglish
Pages (from-to)277-281
Number of pages5
JournalElectrochimica Acta
Volume86
DOIs
Publication statusPublished - 2012 Dec 30
Externally publishedYes

Keywords

  • Cell balancing
  • Electrode potential profile
  • Hybrid capacitors
  • LiTiO

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

Fingerprint Dive into the research topics of 'Voltage characteristics and capacitance balancing for Li<sub>4</sub>Ti <sub>5</sub>O<sub>12</sub>/activated carbon hybrid capacitors'. Together they form a unique fingerprint.

  • Cite this