Cathode active material and lithium battery employing the same

• US 6,866,963 B2
• Filed: 06/26/2001
• Issued: 03/15/2005
• Est. Priority Date: 09/04/2000
• Status: Expired due to Fees

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Seung, Do-Young, Jung, Won-cheol, Moon, Sung-in, Do, Chil-hoon
• Primary Examiner(s): Bell, Bruce F.
• Assistant Examiner(s): WILLS, MONIQUE M
• Application Number:
  US09/888,435
• Publication Number:
  US 20020055039A1
• Time in Patent Office: 1,358 Days
• Field of Search: 429/212, 429/213, 568/18, 568/21, 568/23, 568/25
• US Class Current: 429/212
• CPC Class Codes: C07C 323/20 with singly-bound oxygen atoms bound to carbon atoms of the same non-condensed six-membered aromatic ring
• CPC Class Codes: C07D 341/00 Heterocyclic compounds containing rings having three or more sulfur atoms as the only ring hetero atoms
• CPC Class Codes: C07D 495/14 Ortho-condensed systems
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 4/137 Electrodes based on electro-active polymers
• CPC Class Codes: H01M 4/60 of organic compounds
• CPC Class Codes: H01M 4/606 containing aromatic main chain polymers
• CPC Class Codes: H01M 4/622 being polymers
• CPC Class Codes: H01M 4/625 Carbon or graphite
• CPC Class Codes: H01M 50/414 Synthetic resins, e.g. thermoplastics or thermosetting resins
• CPC Class Codes: H01M 50/429 Natural polymers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A cathode active material and a lithium secondary battery employing the same are provided. In the cathode active material includes cyclic bis (2,5-bis-dithio-1,4-dimethoxybenzene) represented by formula 1:

Claims

1. A cathode active material comprising cyclic bis (2,5-bis-dithio-1,4-dimethoxybenzene) represented by formula 1 a conductive agent and a binder:

2. A lithium battery comprising:

a cathode having a cathode active material layer comprising cyclic bis (2,5-bis-dithio-1,4-dimethoxybenzene) represented by formula 1, a conductive agent and a binder;

an anode having an anode layer comprising lithium metal or a lithium alloy; and

a separator interposed between the cathode and the anode.

3. The lithium battery according to claim 2, wherein the binder comprises at least one selected from the group consisting of polyethylene oxide (PEO), polyacrylonitrile (PAN), polymethyl methacrylate (PMMA), polyvinylidene fluoride (PVDF), acrylonitrile-methyl methacrylate-styrene terpolymer (AMS), vinylidene fluoride-hexafluoropropylene (VDF-HFP) copolymer, polyvinyl chloride (PVD) and cellulose.

4. The lithium battery according to claim 2, wherein the conductive agent comprises at least one selected from the group consisting of carbon black, acetylene black and vapor growth carbon fiber (VGCF).

5. The lithium battery according to claim 2, wherein the separator comprises at least one selected from the group consisting of polyethylene oxide (PEO), polyacrylonitrile (PAN), polymethyl methacrylate (PMMA), polyvinylidene fluoride (PVDF), acrylonitrile-methylmethacrylate-styrene terpolymer (AMS), vinylidenefluoride-hexafluoropropylene (PVDF-HFP) copolymer, polyvinyl chloride (PVD) and cellulose.