Application of potentially biodegradable polyamide and polyester containing disulfide bonds to positive active materials for lithium secondary batteries

摘要

Potentially biodegradable polyamide (poly(imino-3, 3'-dithiodipropionylimino-2, 2'-dithiodiethyl), -(NHCOCH_2CH_2-S-S-CH_2CH_2CO-NHCH_2CH_2S-S-S-CH_2CH_2)_n-, PIDI) and polyester (crosslinked poly(oxy-3, 3'-dithiodipropionyloxymethylene-1, 4-phenylenemethylene, -OCOCH_2CH_2-S-S-CH_2CH_2CH-CHOO_2-C_6H_5-CH_2)n- c-PODOM) were prepared by interfacial polymerization between 3, 3'-dithiodipropionic acid and cystamine, or 1, 4-benzenedimethano. PIDI and c-PODOM showed the electrochemical responses based on reduction the disulfide bonds in the polmer chains and re-oxidation of the produced thiolate anions. Degradation of PIDI and PODOM was investigated in various pH buffer solution. The apparent rate constant of c-PODOM at 25 deg C was 1.3 x10~(-3)