Active substance of positive electrode and nonaqueous electrolyte battery containing the same

• US 20050019659A1
• Filed: 03/26/2003
• Published: 01/27/2005
• Est. Priority Date: 03/27/2002
• Status: Active Grant

• Current Assignee: GS Yuasa International Ltd. (GS Yuasa Corporation)
• Original Assignee: Yuasa Corp (GS Yuasa Corporation)
• Inventors: Kozono, Suguru, Nukuda, Toshiyuki, Inamasu, Tokuo, Fujii, Akihiro, Shiozaki, Ryuji, Nakagawa, Hiroe
• Granted Patent: US 7,691,535 B2
• Time in Patent Office: Days
• US Class Current: 429/231.300
• CPC Class Codes: C01G 45/1242 of the type [Mn2O4]-, e.g. LiMn2O4, Li[MxMn2-x]O4
• CPC Class Codes: C01G 51/42 containing alkali metals, e.g. LiCoO2
• CPC Class Codes: C01G 53/50 of the type [MnO2]n- , e.g. Li(NixMn1-x)O2, Li(MyNixMn1-x-y)O2
• CPC Class Codes: C01P 2002/52 containing elements as dopants
• CPC Class Codes: C01P 2006/40 Electric properties
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• 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 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A positive active material is provided which can give a battery having a high energy density and excellent high-rate discharge performance and inhibited from decreasing in battery, performance even in the case of high-temperature charge. Also provided is a non-aqueous electrolyte battery employing the positive active material. The positive active material contains a composite oxide which is constituted of at least lithium (Li), manganese (Mn), nickel (Ni), cobalt (Co), and oxygen (O) and is represented by the following chemical composition formula: Li_aMn_bNi_cCo_dO_e (wherein 0<a≦1.3, |b−c|≦0.05, 0.6≦d<1, 1.7≦e≦2.3, and b+c+d=1). The non-aqueous electrolyte battery has a positive electrode containing the positive active material, a negative electrode, and a non-aqueous electrolyte.

Claims

1-6. -6. (Canceled)

7. A positive active material comprising a composite oxide which is constituted of at least lithium (Li), manganese (Mn), nickel (Ni), cobalt (Co), and oxygen (O) and is represented by the following chemical composition formula:

Li_aMn_bNi_cCo_dO_e 

 

(Chemical composition formula

     1)

(wherein 0<

a≦

1.3

|b−

c|≦

0.05

0.6≦

d<

1

1.7≦

e≦

2.3

b+c+d=1).

9. A non-aqueous electrolyte battery having a positive electrode containing the positive active material of claim 7, a negative electrode, and a non-aqueous electrolyte.

8. A positive active material comprising a composite oxide which is constituted of at least lithium (Li), manganese (Mn), nickel (Ni), cobalt (Co), and oxygen (O) and is represented by the following chemical composition formula:

Li_aMn_bNi_cCo_dO_e 

 

(Chemical composition formula

     1)

(wherein O<

a≦

1.3

|b−

c|<

0.03

0.8≦

d<

1

1.7≦

e<

2.3

b+c+d=1).

10. A non-aqueous electrolyte battery having a positive electrode containing the positive active material of claim 8, a negative electrode, and a non-aqueous electrolyte.

11. A non-aqueous electrolyte battery having a positive electrode, a negative electrode, and a non-aqueous electrolyte, characterized in that the positive electrode contains a lithium-manganese oxide (A) having a spinel structure and represented by the general formula LiMn₂O₄ and a lithium-nickel-manganese-cobalt composite oxide (B) having an α

-NaFeO₂ type layer structure and represented by the general formula Li_aMn_bNi_cCo_dO_e.

wherein

0<

a≦

1.3

|b−

c|≦

0.05

0.6≦

d<

1

1.7≦

e≦

2.3

b+c+d=1.

12. A non-aqueous electrolyte battery having a positive electrode, a negative electrode, and a non-aqueous electrolyte, characterized in that the positive electrode contains a lithium-manganese oxide (A) having a spinel structure and represented by the general formula LiMn₂O₄ and a lithium-nickel-manganese-cobalt composite oxide (B) having an α

-NaFeO₂ type layer structure and represented by the general formula Li_aMn_bNi_cCo_dO_e,

wherein

0<

a≦

1.3

|b−

c|<

0.03

0.8≦

d<

1

1.7≦

e≦

2.3

b+c+d=1.

14. The non-aqueous electrolyte battery of claim 12, characterized in that the positive electrode contains the (A) and the (B) in a proportion (weight ration) of from 5:

95 to 90;

10.