Polyaniline
AssigneeBridgestone Corporation
InventorsTadashi Nakajima, Shinichi Toyosawa, Shigeru Kijima, Katsuhiko Arai, Yuko Maeda, Masao Ogawa, Takahiro Kawagoe, Yasuhiro Iino, Ryuzo Osawa, Yuichi Ishino
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Abstract
A polyaniline is highly conductive and less corrosive when it contains up to 7 mol % of benzenoid-ammonium salt state and up to 25 mol % of quinoid-diimine state, based on the total molar amount of the polyaniline.
Claims4
A polyaniline in which up to 7 mol % of said polyaniline is present in the benzenoid-ammonium salt state and up to 25 mol % of said polyaniline is present in the quinoid-diimine state, based on the total molar amount of the polyaniline, and wherein said polyaniline predominantly contains a polyaniline in the dope-semiquinone radical state having a higher maximum electron density at 7-9 eV than at 15-20 eV when analyzed by X-ray photoelectron spectroscopy.
A polyaniline in which up to 7 mol % of said polyaniline is present in the benzenoid-ammonium salt state and and up to 25 mol % of said polyaniline is present in the quinoid-diimine state, based on the total molar amount of the polyaniline, and wherein said polyaniline exhibits a peak in the range of 140-145 ppm and no peak having an intensity of more than 85% of that of said peak in the range less than 140 ppm in the .sup.13 C solid state high-resolution NMR analysis with a contact time of 1 msec. and a relaxation time of 20 .mu.sec.
A secondary cell which comprises a positive electrode active material in the form of a polyaniline in which up to 7 mol % of said polyaniline is present in the benzenoid-ammonium salt state and up to 25 mol % of said polyaniline is present in the quinoid-diimine state, based on the total molar amount of the polyaniline, and wherein the polyaniline is predominantly in the dope semiquinone radical state having a higher maximum electron density at 7-9 eV than at 15-20 eV when analyzed by X-ray photoelectron spectroscopy.
A secondary cell which comprises a positive electron active material in the form of a polyaniline in which up to 7 mol % of said polyaniline is present in the benzenoid-ammonium salt state and up to 25 mol % of said polyaniline is present in the quinoid-diimine state, based on the total molar amount of the polyaniline, and wherein said polyaniline is predominantly in the dope-semiquinone radical state exhibiting a peak in the range of 140-145 ppm and no peak having an intensity of more than 85% of that of said peak in the range less than 140 ppm in a .sup.13 C solid state high-resolution NMR analysis with a contact of 1 msec. and a relaxation time of 20 .mu.sec.
Dependencies are inferred from the claim text.