TY - JOUR

T1 - Resistivity-temperature behavior of intrinsically conducting bis(3-methoxysalicylideniminato)nickel polymer

AU - Beletskii, Evgenii

AU - Ershov, Valentin

AU - Danilov, Stepan

AU - Lukyanov, Daniil

AU - Алексеева, Елена Валерьевна

AU - Levin, Oleg

N1 - Funding Information: This research was funded by the Russian Science Foundation, grant number 19-19-00175. Publisher Copyright: © 2020 by the authors. Licensee MDPI, Basel, Switzerland. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/12

Y1 - 2020/12

N2 - Materials with a positive temperature coefficient have many applications, including overcharge and over-temperature protection in lithium-ion (Li-ion) batteries. The thermoresistive properties of an electrically conductive polymer, based on a Ni(salen)-type backbone, known as polyNiMeOSalen, were evaluated by means of in situ resistivity measurements. It was found that the polymer was conductive at temperatures below 220◦C; however, the polymer increased in resistivity by three orders of magnitude upon reaching 250◦C. Thermogravimetric results combined with elemental analyses revealed that the switch from the insulation stage to the conductive stage resulted from thermally dedoping the polymer. Electrochemical studies demonstrated that a polymer retains its electroactivity when it is heated and can be recovered to a conductive state through oxidation via electrochemical doping in an electrolyte solution.

AB - Materials with a positive temperature coefficient have many applications, including overcharge and over-temperature protection in lithium-ion (Li-ion) batteries. The thermoresistive properties of an electrically conductive polymer, based on a Ni(salen)-type backbone, known as polyNiMeOSalen, were evaluated by means of in situ resistivity measurements. It was found that the polymer was conductive at temperatures below 220◦C; however, the polymer increased in resistivity by three orders of magnitude upon reaching 250◦C. Thermogravimetric results combined with elemental analyses revealed that the switch from the insulation stage to the conductive stage resulted from thermally dedoping the polymer. Electrochemical studies demonstrated that a polymer retains its electroactivity when it is heated and can be recovered to a conductive state through oxidation via electrochemical doping in an electrolyte solution.

KW - Conductivity

KW - Positive temperature coefficient

KW - Salen polymer

KW - Thermostability

UR - http://www.scopus.com/inward/record.url?scp=85097531135&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/e8bc3841-9cd0-3c9a-97af-8d614e6285cc/

U2 - 10.3390/polym12122925

DO - 10.3390/polym12122925

M3 - Article

AN - SCOPUS:85097531135

VL - 12

SP - 1

EP - 10

JO - Polymers

JF - Polymers

SN - 2073-4360

IS - 12

M1 - 2925

ER -