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Ionic conductivity of PPO‐sulfonamide salt hybrids and their network polymers
Author(s) -
Tominaga Yoichi,
Mizumo Tomonobu,
Ohno Hiroyuki
Publication year - 2000
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/1099-1581(200008/12)11:8/12<524::aid-pat999>3.0.co;2-8
Subject(s) - ionic conductivity , materials science , electrolyte , conductivity , lithium (medication) , ionic bonding , electrochemistry , glass transition , salt (chemistry) , amorphous solid , chemical engineering , polymer , polymer chemistry , phase (matter) , ion , organic chemistry , chemistry , composite material , electrode , engineering , medicine , endocrinology
New type of polymer electrolytes containing poly(propylene oxide) (PPO)/sulfonamide (SA) lithium salt (‐NLi‐SO 2 ‐) unit were synthesized and the electrochemical properties were analyzed. The mono‐ or di‐charged hybrids became amorphous salt and showed low glass transition temperature, but the bulk ionic conductivity was lower than 10 −6 S/cm at room temperature. The introduction of terminal group having strong electron‐withdrawing effect on the SA end improved the ionic conductivity. The maximum ionic conductivity was observed (1.7 × 10 −5 S/cm at 30 °C) when the terminal group of PPO 500 ‐SA Li salt hybrid was trifluorometyl (‐CF 3 ) group. On the other hand, two types of hybrid‐networks were also synthesized. They were rubbery solids with amorphous phase. The ionic conductivity was less than 10 −8 S/cm because of the relatively higher Tg. The ionic conductivity of the network was improved more than 1000 times by the addition of PPO 500 ‐SALi‐CF 3 . The Blend of the network and oligomer gave homogeneously mixed dry polymer electrolyte without phase separation. The electrochemical characteristics was analyzed with Li ∥ PPO electrolyte ∥ Li cell under dc electric field. Copyright © 2000 John Wiley & Sons, Ltd.