Lithium secondary battery
First Claim
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1. A lithium secondary battery comprising:
- a case;
a negative electrode accommodated in said case and containing a polymeric material which absorbs and desorbs lithium ions and which has been formed by heat-treating a polymer in a non-oxidizing atmosphere at 500°
to 1000°
C., the polymer having as a main repeating unit a structure represented by formula (I) below;
##STR10## wherein R1 to R4 may be the same or different and represent hydrogen, an alkyl group, a phenyl group, or a naphthyl group;
a positive electrode accommodated in said case and so arranged as to oppose said negative electrode with a separator sandwiched therebetween; and
a nonaqueous electrolyte contained in said case.
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Abstract
A lithium secondary battery with a large capacity and a long cycle life is disclosed. This lithium secondary battery includes a case, a negative electrode accommodated in the case and containing a polymeric material which has been formed by heat-treating a polymer having a perynaphthalene structure as a main repeating unit in a non-oxidizing atmosphere at 500° to 1000° C. and which absorbs and desorbs lithium ions, a positive electrode accommodated in the case and so arranged as to oppose the negative electrode with a separator sandwiched between them, and a nonaqueous electrolyte contained in the case.
29 Citations
23 Claims
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1. A lithium secondary battery comprising:
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a case; a negative electrode accommodated in said case and containing a polymeric material which absorbs and desorbs lithium ions and which has been formed by heat-treating a polymer in a non-oxidizing atmosphere at 500°
to 1000°
C., the polymer having as a main repeating unit a structure represented by formula (I) below;
##STR10## wherein R1 to R4 may be the same or different and represent hydrogen, an alkyl group, a phenyl group, or a naphthyl group;a positive electrode accommodated in said case and so arranged as to oppose said negative electrode with a separator sandwiched therebetween; and a nonaqueous electrolyte contained in said case. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A lithium secondary battery comprising:
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a case; a negative electrode accommodated in said case and containing a polymeric material which absorbs and releases lithium ions and which comprises a heat-treated material of polymer having as a main repeating unit a structure represented by formula (I) below;
##STR11## wherein R1 to R4 may be the same or different and represent hydrogen, an alkyl group, a phenyl group, or a naphthyl group, and having one aromatic ring vibrational peak at 1500 to 1700 cm-1 in infrared photo-acoustic spectroscopy and a peak derived from aromatic ring at 100 to 150 ppm in a solid-state C13 NMR spectrum;a positive electrode accommodated in said case and so arranged as to oppose said negative electrode with a separator sandwiched therebetween; and a nonaqueous electrolyte contained in said case. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A lithium secondary battery comprising:
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a case; a negative electrode accommodated in said case and containing a polymeric material which absorbs and desorbs lithium ions, and which comprises a polymer having a structure represented by formula (II) below ##STR12## as a repeating unit in each of X and Y directions such that the repeating unit in the X direction is equal to or larger than the repeating unit in the Y direction wherein said polymeric material has one aromatic ring vibrational peak at 1500 to 1700 cm-1 in infrared photo-acoustic spectroscopy and has a peak derived from aromatic ring at 100 to 150 ppm in a silid-state C13 NMR spectrum; a positive electrode accommodated in said case and so arranged as to oppose said negative electrode with a separator sandwiched therebetween; and a nonaqueous electrolyte contained in said case. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification