Active substance of positive electrode and non-aqueous electrolyte battery containing the same
View Patent ↗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 a Mn b Ni c Co d O 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.
1. A positive active material comprising:
a composite oxide which comprises lithium (Li), manganese (Mn), nickel (Ni), cobalt (Co), and oxygen (O) and is represented by the following chemical composition formula:
Li a Mn b Ni c Co d O 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, and
wherein said composite oxide shows a single-phase structure belonging to space group R3-m as a result of examination by X-ray diffractometry.
2. A non-aqueous electrolyte battery, comprising:
a positive electrode including the positive active material of claim 1 ;
a negative electrode; and
a non-aqueous electrolyte.
3. The positive active material of claim 1 , wherein b+c≦0.4.
4. The positive active material of claim 1 , wherein 0<c−b≦0.05.
5. The positive active material of claim 1 , wherein said composite oxide consists essentially of a single-phase structure belonging to space group R3-m.
6. The positive active material of claim 1 , wherein diffraction lines observed by X-ray diffractometry for said composite oxide are limited to lines attributable to a single-phase structure belonging to space group R3-m.
7. The positive active material of claim 1 , wherein b+c≦0.4, 0<c−b≦0.05, and 0.6≦d≦0.833.
8. The positive active material of claim 1 , wherein |b−c|=0 and 0.6≦d≦0.833.
9. A positive active material comprising:
a composite oxide which comprises lithium (Li), manganese (Mn), nickel (Ni), cobalt (Co), and oxygen (O) and is represented by the following chemical composition formula:
Li a Mn b Ni c Co d O e (Chemical composition formula 1)
wherein 0<a≦1.3
|b−c|<0.03
0.8≦d<1
1.7≦e<2.3
b+c+d=1, and
wherein said composite oxide shows a single-phase structure belonging to space group R3−m as a result of examination by X-ray diffractometry.
10. A non-aqueous electrolyte battery, comprising:
a positive electrode including the positive active material of claim 9 ;
a negative electrode; and
a non-aqueous electrolyte.
11. A non-aqueous electrolyte battery, comprising:
a positive electrode, a negative electrode, and a non-aqueous electrolyte,
wherein the positive electrode comprises a lithium-manganese oxide (A) having a spinel structure and represented by the general formula LiMn 2 O 4 and a lithium-nickel-manganese-cobalt composite oxide (B) having an α-NaFeO 2 layer structure and represented by the general formula Li a Mn b Ni c Co d O e ,
wherein a weight ratio of(A) to (B) is in a range from 5:95 to 10:90,
wherein
0<a≦1.3
|b−c|≦0.05
0.6≦d<1
1.7≦e≦2.3
b+c+d=1, and
wherein said composite oxide shows a single-phase structure belonging to space group R3-m as a result of examination by X-ray diffractometry.
12. A non-aqueous electrolyte battery, comprising:
a positive electrode, a negative electrode, and a non-aqueous electrolyte,
wherein the positive electrode comprises a lithium-manganese oxide (A) having a spinel structure and represented by the general formula LiMn 2 O 4 and a lithium-nickel-manganese-cobalt composite oxide (B) having an α-NaFeO 2 layer structure and represented by the general formula Li a Mn b Ni c Co d O e ,
wherein a weight ratio of(A) to (B) is in a range from 5:95 to 10:90,
wherein
0<a≦1.3
|b−c|<0.03
0.8≦d<1
1.7≦e≦2.3
b+c+d=1, and
wherein said composite oxide shows a single-phase structure belonging to space group R3-m as a result of examination by X-ray diffractometry.
13. A positive active material comprising:
a composite oxide which comprises lithium (Li), manganese (Mn), nickel (Ni), cobalt (Co), and oxygen (O) and is represented by the following chemical composition formula:
Li a Mn b Ni c Co d O e (Chemical composition formula 1)
wherein 0<a≦1.3
|b−c|≦0.05
0.6≦d≦0.833
1.7≦e≦2.3
b+c+d=1, and
wherein said composite oxide shows a single-phase structure belonging to space group R3-m as a result of examination by X-ray diffractometry.
14. A non-aqueous electrolyte battery, comprising:
a positive electrode including the positive active material of claim 13 ;
a negative electrode; and
a non-aqueous electrolyte.
15. A positive active material comprising:
a composite oxide which comprises lithium (Li), manganese (Mn), nickel (Ni), cobalt (Co), and oxygen (O) and is represented by the following chemical composition formula:
Li a Mn b Ni c Co d O e (Chemical composition formula 1)
wherein 0<a≦1.3
|b−c|<0.03
0.8≦d≦0.833
1.7≦e≦2.3
b+c+d=1, and
wherein said composite oxide shows a single-phase structure belonging to space group R3-m as a result of examination by X-ray diffractometry.
16. A non-aqueous electrolyte battery, comprising:
a positive electrode including the positive active material of claim 15 ;
a negative electrode; and
a non-aqueous electrolyte.
17. A non-aqueous electrolyte battery, comprising:
a positive electrode, a negative electrode, and a non-aqueous electrolyte,
wherein the positive electrode comprises a lithium-manganese oxide (A) having a spinel structure and represented by the general formula LiMn 2 O 4 and a lithium-nickel-manganese-cobalt composite oxide (B) having an α-NaFeO 2 layer structure and represented by the general formula Li a Mn b Ni c Co d O e ,
wherein
0<a≦1.3
|b−c|≦0.05
0.9≦d<1
1.7≦e≦2.3
b+c+d=1
b<0.05, and
wherein said composite oxide shows a single-phase structure belonging to space group R3-m as a result of examination by X-ray diffractometry.
18. The non-aqueous electrolyte battery of claim 17 , wherein the positive electrode includes (A) and the (B) in a proportion (weight ratio) of from 5:95 to 90:10.
19. A non-aqueous electrolyte battery, comprising:
a positive electrode, a negative electrode, and a non-aqueous electrolyte,
wherein the positive electrode comprises a lithium-manganese oxide (A) having a spinel structure and represented by the general formula LiMn 2 O 4 and a lithium-nickel-manganese-cobalt composite oxide (B) having an α-NaFeO 2 layer structure and represented by the general formula Li a Mn b Ni c Co d O e ,
wherein
0<a≦1.3
|b−c|<0.03
0.9≦d<1
1.7≦e≦2.3
b+c+d=1
b<0.05, and
wherein said composite oxide shows a single-phase structure belonging to space group R3-m as a result of examination by X-ray diffractometry.
20. The non-aqueous electrolyte battery of claim 19 , wherein the positive electrode includes (A) and the (B) in a proportion (weight ratio) of from 5:95 to 90:10.