§
Luxuse
Patent Intelligence
Sign In
Patent EP0413313A2 successfully refreshed from Google Patents.
← Back to Patent Explorer
EP0413313A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Non-aqueous secondary cell

Assignee: Sanyo Electric Co Ltd
•
Filing: 1990-08-14
•
Granted: —
•
Expires: 2010-08-14
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A rechargeable non-aqueous secondary cell comprising a negative electrode (1); a positive electrode (7) comprising a lithium-including manganese oxide as an active material, the lithium-including manganese oxide having a specific surface area measured by the BET method of 9.0m²/g to 67.5m²/g; and a separator (8) interposed between the positive and the negative electrodes and impregnated with a non-­aqueous electrolyte. A rechargeable non-aqueous secondary cell comprising a negative electrode; a positive electrode comprising a lithium-including manganese oxide as an active material, grain sizes of which are substantially 20 µm or less when observed by a scanning electron microscope; and a separator interposed between the positive and said negative electrodes.

Inventors

  • 👤 Nobuhiro Furukawa
  • 👤 Toshiyuki Nohma
  • 👤 Yuji Yamamoto

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-28 20:48
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/13; H01M4/131; H01M10/00; H01M10/05; H01M10/052; H01M4/36; H01M4/48; H01M4/485; H01M4/50; H01M4/505; Y; Y02; Y02E; Y02E60/00; Y02E60/10

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 105 words
A rechargeable non-aqueous secondary cell comprising a negative electrode, a positive electrode and a separator interposed between said positive and said negative electrodes and impregnated with a non-aqueous electrolyte, said cell being characterized in that a positive electrode comprises a lithium-including manganese oxide, acting as an active material, which has a certain range of specific surface area or which has a certain range of grain sizes, the above certain range of specific surface area being 9.0m²/g to 67.5m²/g when measured by the BET method and the above certain range of grain sizes being substantially 20 µm or less when observed by a scanning electron microscope.
Claim 2
Dependent Claim 105 words
A rechargeable non-aqueous secondary cell comprising a negative electrode, a positive electrode and a separator interposed between said positive and said negative electrodes and impregnated with a non-aqueous electrolyte, said cell being characterized in that a positive electrode comprises a lithium-including manganese oxide, acting as an active material, which has a certain range of specific surface area or which has a certain range of grain sizes, the above certain range of specific surface area being 9.0m²/g to 67.5m²/g when measured by the BET method and the above certain range of grain sizes being substantially 20 µm or less when observed by a scanning electron microscope.
Claim 3
Dependent Claim 42 words
A rechargeable non-aqueous secondary cell of Claim 1, wherein said lithium-including manganese oxide is obtained from manganese dioxide and lithium hydroxide and the specific surface area of said lithium-including manganese oxide is determined by a specific surface area of said manganese dioxide.
Claim 4
Dependent Claim 45 words
A rechargeable non-aqueous secondary cell of Claim 1, wherein said lithium-including manganese oxide is obtained from manganese dioxide and lithium hydroxide and the specific surface area of said lithium-including manganese oxide is determined by a mixing ratio of said manganese dioxide and said lithium hydroxide.
Claim 5
Dependent Claim 48 words
A rechargeable non-aqueous secondary cell of Claim 1, wherein said lithium-including manganese oxide is obtained from manganese dioxide and lithium hydroxide and the specific surface area of said lithium-including manganese oxide is determined by a heat-treating temperature of a mixture of said manganese dioxide and said lithium hydroxide.
Claim 6
Dependent Claim 22 words
A rechargeable non-aqueous secondary cell of Claim 1, wherein said negative electrode is formed of either of lithium and a lithium alloy.
Claim 7
Dependent Claim 28 words
A rechargeable non-aqueous secondary cell of Claim 1, wherein said electrolyte is formed of a mixture of propylene carbonate and dimethoxyethane added with 1 mol/ℓ of lithium perchlorate.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag