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Peripherally polymerized octacyanophthalocyanine as cathode material of lithium rechargeable batteries 1
Author(s) -
Asai Yoshihiro,
Onishi Ken,
Arai Takayuki,
Matsumoto Michiko,
Miyata Seizo,
Shigehara Kiyotaka
Publication year - 2001
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/pat.130
Subject(s) - cathode , electrolyte , lithium (medication) , materials science , redox , polymerization , metal , ion , electrode , polymer , phase (matter) , chemical engineering , chemistry , composite material , organic chemistry , metallurgy , medicine , engineering , endocrinology
Highly pure metal‐free octacyanophthalocyanine (H 2 PcOC) was further converted into two‐dimensional polymers (PPcCN) by solid‐phase reaction in presence of tetracyanobenzene. PPcCN showed the electric conductivity as high as about 5·10 −4 S cm −1 , 2‐orders of magnitude larger than that of H 2 PcOC. Since PPcCN exhibited reversible multi‐electron redox reaction at relatively positive potential near −0.3 V vs. NHE and was insoluble throughout the redox reaction in any organic electrolyte solutions, this polymer is useful in lithium (ion) rechargeable batteries as cathode‐active material. When the depth of discharge was controlled to 150 mAh g −1 , the cell composed of [metallic Li/electrolyte/PPcCN] gave very stable cycle property for several hundred charge‐discharge cycles with the average output voltage of 2.73 V and the energy density of 409 Wh kg −1 , of which value is comparable to commercial lithium ion batteries based on Li x (CoO 2 ) y cathode. Copyright © 2001 John Wiley & Sons, Ltd.