Nonaqueous electrolyte battery

Patent metadata

Field	Value
Publication number	US-9698415-B2
Application number	US-201314076618-A
Country	US
Kind code	B2
Filing date	Nov 11, 2013
Priority date	Mar 31, 2004
Publication date	Jul 4, 2017
Grant date	Jul 4, 2017

Abstract

A nonaqueous electrolyte battery includes a positive electrode containing an active material, a negative electrode, and a nonaqueous electrolyte, the negative electrode including a current collector and a negative electrode active material supported by the current collector, the negative electrode active material having a Li insertion potential not lower than 0.2V (vs. Li/Li + ) and an average primary particle diameter not larger than 1 μm, and a specific surface area of the negative electrode, excluding a weight of the current collector, as determined by the BET method falls within a range of 3 to 50 m 2 /g.

First claim

What is claimed is:

1. A nonaqueous electrolyte battery comprising:
a metallic container;
a positive electrode provided in the metallic container and comprising an active material;
a negative electrode provided in the metallic container and comprising a current collector and a porous negative electrode layer which comprises one surface supported by the current collector, the porous negative electrode layer comprising a negative electrode active material having a Li insertion potential not lower than 0.2V (vs. Li/Li + ) and an average primary particle diameter not larger than 1 μm; and
a nonaqueous electrolyte provided in the metallic container,
wherein a surface area per gram of the porous negative electrode layer falls within a range of 3 to 50 m 2 /g, and the surface area per gram of the porous negative electrode layer is a surface area of a whole of the porous negative electrode layer obtained by measuring two pieces of the negative electrode each having a size of 2 cm×2 cm by the BET method utilizing N 2 adsorption, and a weight of the negative electrode (excluding a weight of the current collector).

2. The nonaqueous electrolyte battery according to claim 1 , wherein a porosity of the negative electrode excluding the current collector falls within a range of 20 to 50%.

3. The nonaqueous electrolyte battery according to claim 1 , wherein the Li insertion potential of the negative electrode active material is 0.2 to 3V (vs. Li/Li + ).

4. The nonaqueous electrolyte battery according to claim 1 , wherein the average primary particle diameter of the negative electrode active material is 0.001 to 1 μm.

5. The nonaqueous electrolyte battery according to claim 1 , wherein the surface area per gram of the porous negative electrode layer falls within a range of 5 to 50 m 2 /g.

6. The nonaqueous electrolyte battery according to claim 1 , wherein the negative electrode active material comprises a lithium titanium oxide and/or a titanium-containing composite oxide.

7. The nonaqueous electrolyte battery according to claim 6 , wherein the lithium titanium oxide is represented by Li 4+x Ti 5 O 12 (−1≦x≦3) or Li 2+x Ti 3 O 7 (−1≦x≦3).

8. The nonaqueous electrolyte battery according to claim 6 , wherein the titanium-containing composite oxide comprises at least one kind of element selected from the group consisting of P, V, Sn, Cu, Ni, and Fe.

9. The nonaqueous electrolyte battery according to claim 1 , wherein the active material of the positive electrode comprises at least one kind of the compound selected from the group consisting of a lithium-nickel-cobalt-manganese composite oxide, a spinel-type lithium-manganese-nickel composite oxide, a lithium-phosphorus oxide having an olivine structure, a lithium-cobalt oxide, a lithium-nickel-cobalt composite oxide, and a lithium-manganese composite oxide.

10. The nonaqueous electrolyte battery according to claim 9 , wherein the lithium-nickel-cobalt-manganese composite oxide is represented by Li a Ni b Co c Mn d O 2 and the molar ratios of a, b, c, and d fall within the ranges of 0≦a≦1.1, 0.1≦b≦0.5, 0≦c≦0.9, and 0.1≦d≦0.5.

11. The nonaqueous electrolyte battery according to claim 1 , wherein the nonaqueous electrolyte comprises an ionic liquid.

12. The nonaqueous electrolyte battery according to claim 1 , wherein the nonaqueous electrolyte comprises a molten salt, the molten salt containing lithium ion, organic cation having a skeletal structure given below and anion:

13. The nonaqueous electrolyte battery according to claim 12 , wherein the organic cation comprises alkyl imidazolium ion and/or tetraalkyl ammonium ion, and the anion comprises at least one ion selected from the group consisting of BF 4 − , PF 6 − , AsF 6 − , ClO 4 − , CF 3 SO 3 − , CF 3 COO − , CH 3 COO − , CO 3 2− , N(CF 3 SO 2 ) 2 − , N(C 2 F 5 SO 2 ) 2 − , and (CF 3 SO 2 ) 3 C − .

14. The nonaqueous electrolyte battery according to claim 1 , wherein the nonaqueous electrolyte comprises at least one kind of a nonaqueous solvent selected from the group consisting of propylene carbonate, ethylene carbonate, diethyl carbonate, and γ-butyrolactone.

15. The nonaqueous electrolyte battery according to claim 1 , wherein the negative electrode active material comprises a lithium titanium oxide and/or a titanium-containing composite oxide, and the active material of the positive electrode comprises at least one kind of the compound selected from the group consisting of a lithium-nickel-cobalt-manganese composite oxide, a spinel-type lithium-manganese-nickel composite oxide, a lithium-phosphorus oxide having an olivine structure, a lithium-cobalt oxide, a lithium-nickel-cobalt composite oxide, and a lithium-manganese composite oxide.

16. The nonaqueous electrolyte battery according to claim 1 , wherein the surface opposite to the one surface of the porous negative electrode layer faces the positive electrode.

17. The nonaqueous electrolyte battery according to claim 1 , which comprises a separator provided between the positive electrode and the negative electrode, and the surface opposite to the one surface of the porous negative electrode layer faces the separator.

18. A nonaqueous electrolyte battery comprising:
a metallic container;
a positive electrode provided in the metallic container and comprising an active material;
a negative electrode provided in the metallic container and comprising a current collector and a porous negative electrode layer which comprises one surface supported by the current collector, the porous negative electrode layer comprising a negative electrode active material, the negative electrode active material comprising a lithium titanium oxide and/or a titanium-containing composite oxide and having an average primary particle diameter not larger than 1 μm; and
a nonaqueous electrolyte provided in the metallic container,
wherein a surface area per gram of the porous negative electrode layer falls within a range of 3 to 50 m 2 /g, and the surface area per gram of the porous negative electrode layer is a surface area of a whole of the porous negative electrode layer obtained by measuring two pieces of the negative electrode each having a size of 2 cm×2 cm by the BET method utilizing N 2 adsorption, and a weight of the negative electrode (excluding a weight of the current collector).

19. The nonaqueous electrolyte battery according to claim 18 , wherein:
the active material of the positive electrode comprises at least one compound selected from the group consisting of a lithium-nickel-cobalt-manganese composite oxide, a spinel-type lithium-manganese-nickel composite oxide, a lithium-phosphorus oxide having an olivine structure, a lithium-cobalt oxide, a lithium-nickel-cobalt composite oxide, and a lithium-manganese composite oxide; and
the nonaqueous electrolyte comprises alkyl imidazolium ion and/or tetraalkyl ammonium ion, lithium ion, and at least one kind of an anion selected from the group consisting of BF 4 − , PF 6 − , AsF 6 − , ClO 4 − , CF 3 SO 3 − , CF 3 COO − , CH 3 COO − , CO 3 2− , N(CF 3 SO 2 ) 2 − , N(C 2 F 5 SO 2 ) 2 − , and (CF 3 SO 2 ) 3 C − .

20. The nonaqueous electrolyte battery according to claim 18 , wherein:
the active material of the positive electrode comprises at least one compound selected from the group consisting of a lithium-nickel-cobalt-manganese composite oxide, a spinel-type lithium-manganese-nickel composite oxide, a lithium-phos

Assignees

• Toshiba Kk

Inventors

• Takami Norio
• Inagaki Hiroki

Classifications

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M4/131 Primary

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title