Lithium manganese complex oxide anode material for lithium secondary batteries and a lithium secondary battery using the same

• US 6,465,130 B1
• Filed: 11/22/1999
• Issued: 10/15/2002
• Est. Priority Date: 05/21/1999
• Status: Expired due to Term

• Current Assignee: Mitshi Mining & Smelting Company, Ltd.
• Original Assignee: Mitsui Mining and Smelting Company Limited
• Inventors: Ishida, Shintarou, Numata, Koichi
• Primary Examiner(s): Ryan, Patrick
• Assistant Examiner(s): Ruthkosky, Mark
• Application Number:
  US09/447,398
• Time in Patent Office: 1,058 Days
• Field of Search: 429/224, 429/218, 423/599
• US Class Current: 429/224
• CPC Class Codes: H01M 10/052 Li-accumulators
• 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: Y02E 60/10 Energy storage using batteries

Abstract

The anode material to be used for non-aqueous electrolyte secondary batteries according to the present invention is composed of a Li-Mn type complex oxide having a spinel structure, either or both of the occupancy rate (g_c) value of cations in an unit lattice of the material to be determined based on the composition, the lattice constant and the density or/and the ocupancy rate (g_a) value of anions in an unit lattice of the material to be determined based on the composition, the lattice constant and the density is/are adjusted to a value of 0.985 or less. The actions of the complex are partially substituted with aluminum or magnesium.

Claims

1. An anode material for lithium secondary batteries comprising a Li-Mn complex oxide having a spinel structure wherein either or both of the occupancy ratio (g4) of cations in a unit lattice which is determined based on the composition and the material density and/or the occupancy value (g4) of anions in a unit lattice which is determined on the composition, lattice constant and the material density is adjusted to a value of 0.985 or less, a portion of the cations in the Li-Mn complex oxide is replaced with aluminum or magnesium.

2. The anode of claim 1 wherein Li-Mn complex oxide has the formula LiMn_2-x Al_xO₄.

3. A lithium secondary battery having as the anode, the anode material of claim 1.

4. A lithium secondary battery having as the anode, the anode material of claim 2.