Premium
Low‐Temperature High‐Rate Capabilities of Lithium Batteries via Polarization‐Assisted Ion Pathways
Author(s) -
Teranishi Takashi,
Katsuji Naoto,
Chajima Keisuke,
Yasuhara Sou,
Inohara Masahiro,
Yoshikawa Yumi,
Yasui Shintaro,
Hayashi Hidetaka,
Kishimoto Akira,
Itoh Mitsuru
Publication year - 2018
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201700413
Subject(s) - materials science , dielectric , electrolyte , polarization (electrochemistry) , optoelectronics , permittivity , cathode , ion , thin film , pulsed laser deposition , nanotechnology , electrical engineering , electrode , chemistry , physics , quantum mechanics , engineering
On‐board vehicle applications dictate the need for improved low‐temperature power densities of rechargeable batteries. Integration of high‐permittivity artificial dielectric solid electrolyte interfaces (SEIs) into the lithium ion battery architecture is a promising path to satisfy this need. The relationship between the permittivity of various artificial dielectric SEIs and the resulting high‐rate capability at low temperatures is investigated. Room‐temperature studies reveal a weak relationship between these variables. However, at low temperatures, the correlation between the larger permittivity of the dielectric SEIs and the greater high‐rate capabilities of the cells is striking. The high‐rate capabilities for pulsed laser deposition‐synthesized cathode thin films with various BaTiO 3 (BTO) SEIs covering configurations are evaluated. A remarkable improvement in the high‐rate capability is observed for LiCoO 2 (LCO) modified with dot BTOs, while the rate capability for planar BTO (fully covered LCO) is weakened significantly. A series of experimental results prove that a large polarization, P , in the dielectric SEIs intensified with permittivity accelerates interfacial charge transfer near the dielectrics–LCO–electrolyte triple junction.