Trivalent Ti self-doped Li4Ti5O12: A high performance anode material for lithium-ion capacitors

Shengyang Dong, Xiaoyan Wang, Laifa Shen, Hongsen Li, Jie Wang, Ping Nie, Jingjie Wang, Xiaogang Zhang

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)

Abstract

To enhance kinetics of lithium insertion/extraction of anode materials for hybrid lithium-ion capacitors (hybrid LICs), we develop a new applicable strategy toward the synthesis of trivalent Ti self-doped Li4Ti5O12 nanoparticles. Starting with Ti2O3, we show that subsequent solid state reaction with Li2CO3 leads to the formation of trivalent Ti self-doped Li4Ti5O12. The presence of trivalent Ti gives rise to high electric conductivity and the nanostructure reduces the transport path lengths of lithium-ions and electrons, permitting fast kinetics for both transported lithium-ions and electrons, thus enabling high-power performance. A high performance hybrid LIC is fabricated by using Ti3 + self-doped Li4Ti5O12 as an insertion-type anode and activated carbon derived from outer peanut shell as cathode, which delivers high energy density (67 Wh kg- 1), high power density (8000 W kg- 1). Additionally, the device still retains about 79% of its original capacity even after 5000 cycles at 0.5 A g- 1.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalJournal of Electroanalytical Chemistry
Volume757
DOIs
Publication statusPublished - 2015 Nov 15
Externally publishedYes

Keywords

  • Anode materials
  • Lithium-ion capacitor
  • Ti self-doped LiTiO

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

Fingerprint

Dive into the research topics of 'Trivalent Ti self-doped Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub>: A high performance anode material for lithium-ion capacitors'. Together they form a unique fingerprint.

Cite this