Non-aqueous electrolyte battery and charging method therefor

• US 6,316,145 B1
• Filed: 05/25/1999
• Issued: 11/13/2001
• Est. Priority Date: 03/10/1997
• Status: Expired due to Fees

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Nohma, Toshiyuki, Yoshimura, Seiji, Kamino, Maruo, Kida, Yoshinori, Nishio, Koji, Ohshita, Ryuji
• Primary Examiner(s): Griffin, Steven P.
• Assistant Examiner(s): Strickland, Jonas N.
• Application Number:
  US09/308,622
• Time in Patent Office: 903 Days
• Field of Search: 429/218.1, 429/224, 429/231.1, 429/231.95, 429/231.5, 429/303, 429/306
• US Class Current: 429/231.5
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0565 Polymeric materials, e.g. gel-type or solid-type
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 4/48 of inorganic oxides or hydroxides
• CPC Class Codes: H01M 4/485 of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy H01M4/505, H01M4/525 take precedence
• CPC Class Codes: H01M 4/505 of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• CPC Class Codes: H01M 4/5825 Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

In a non-aqueous electrolyte battery using titanium oxide or lithium titanate as a negative electrode material for negative electrode, polymeric electrolyte is interposed between the negative electrode and a positive electrode. If titanium oxide or lithium titanate is used as the negative electrode material for negative electrode and the polymeric electrolyte is interposed between the negative electrode and the positive electrode, the polymeric electrolyte is less liable to be decomposed by catalytic reduction induced by titanium oxide or lithium titanate. This prevents decline in the charge/discharge efficiency which occurs when a non-aqueous electrolyte solution is used. Thus, the non-aqueous electrolyte battery excellent in charge/discharge efficiency is provided.

Claims

1. A non-aqueous electrolyte battery comprising a negative electrode including lithium titanate with a spinel structure as a negative electrode material, a positive electrode including manganese dioxide containing Li₂MnO₃ as a positive electrode material, and a polymeric electrolyte interposed between said negative electrode and said positive electrode.

2. The non-aqueous electrolyte battery as claimed in claim 1, having a mean battery voltage thereof at the time of discharge of approximately 1.5V.

3. The non-aqueous electrolyte battery as claimed in claim 1, wherein said manganese dioxide containing Li₂MnO₃ used as said positive electrode material is obtained by heat-treating a mixture of manganese dioxide and a lithium salt at temperatures of between 300°

C. and 430°

C.

4. The non-aqueous electrolyte battery as claimed in claim 3, wherein said lithium salt is selected from a group consisting of lithium hydroxide, lithium nitrate, lithium phosphate, lithium carbonate, and lithium acetate.

5. A charging method for non-aqueous electrolyte battery, comprising providing a non-aqueous electrolyte battery comprising a negative electrode including lithium titanate with a spinel structure as a negative electrode material, a positive electrode including manganese dioxide containing Li₂MnO₃ as a positive electrode material and a polymeric electrolyte interposed between the negative electrode and the positive electrode, and charging said non-aqueous electrolyte battery with a solar cell.

6. The charging method for non-aqueous electrolyte battery as claimed in claim 5, wherein said manganese dioxide containing Li₂MnO₃ used as said positive electrode material in the non-aqueous electrolyte battery is obtained by heat-treating a mixture of manganese dioxide and a lithium salt at temperatures of between 300°

C. and 430°

C.

7. The charging method for non-aqueous electrolyte battery as claimed in claim 6, wherein said lithium salt is selected from a group consisting of lithium hydroxide, lithium nitrate, lithium phosphate, lithium carbonate, and lithium acetate.