Nonaqueous electrolyte battery and battery pack

Patent metadata

Field	Value
Publication number	US-9947923-B2
Application number	US-201615051035-A
Country	US
Kind code	B2
Filing date	Feb 23, 2016
Priority date	Feb 16, 2015
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

The nonaqueous electrolyte battery according to one embodiment includes a positive electrode and a negative electrode. The positive electrode contains a positive electrode active material containing manganese-containing composite oxide. The negative electrode contains a negative electrode active material selected from the group consisting of titanium oxide and titanium-containing composite oxide. A ratio p/n of a capacity p per unit area of the positive electrode to a capacity n per unit area of the negative electrode is in the range of 0.8 or more and 1 or less.

First claim

What is claimed is:

1. A nonaqueous electrolyte battery comprising:
a positive electrode comprising a first positive electrode active material and a second positive electrode active material, the first positive electrode active material being a manganese-containing composite oxide having a spinel-type crystal structure and represented by a general formula of Li 1-a Mn 2-x M x O 4 (where M is at least one element selected from Mg, Ti, Cr, Fe, Co, Zn, Al, and Ga, a is within a range of −1 or more and 1 or less, and x is within a range of 0.22 or more and 0.7 or less, the second positive electrode active material having a capacity per weight of 10 mAh/g or more and 150 mAh/a or less in a potential range of 3 V (vs. Li/Li + ) or more and 3.9 V (vs. Li/Li + ) or less with respect to an oxidation-reduction potential of a metal Li, where a ratio of a weight of the second positive electrode active material in the positive electrode to a weight of the first positive electrode active material in the positive electrode is 0.01 or more and 0.05 or less;
a negative electrode containing a negative electrode active material selected from the group consisting of titanium oxide and titanium-containing composite oxide; and
a nonaqueous electrolyte, wherein
a ratio p/n of a capacity p per unit area of the positive electrode to a capacity n per unit area of the negative electrode is within a range of 0.8 or more and 1 or less.

2. The nonaqueous electrolyte battery according to claim 1 , wherein the element M in the general formula of the manganese-containing composite oxide is Al.

3. The nonaqueous electrolyte battery according to claim 1 , wherein the second positive electrode active material is selected from the group consisting of lithium-cobalt composite oxide, lithium-nickel-cobalt composite oxide, lithium-nickel-cobalt-manganese composite oxide, lithium-manganese-cobalt composite oxide, and lithium iron phosphate.

4. The nonaqueous electrolyte battery according to claim 1 , wherein the negative electrode active material is selected from the group consisting of lithium-titanium composite oxide having a spinel-type crystal structure, lithium-titanium composite oxide having a ramsdellite-type structure, monoclinic titanium dioxide, and monoclinic niobium-titanium composite oxide.

5. The nonaqueous electrolyte battery according to claim 1 , further comprising a container member housing the negative electrode, the positive electrode and the nonaqueous electrolyte,
wherein the container member has a wall thickness within the range of 0.2 to 5 mm, and
the container member is a metallic container comprising at least one element selected from the group consisting of Fe, Ni, Cu, Sn, and Al.

6. The nonaqueous electrolyte battery according to claim 1 , further comprising a container member housing the negative electrode, the positive electrode and the nonaqueous electrolyte,
wherein the container member has a wall thickness within the range of 0.1 to 2 mm, and
the container member is a container made of laminate film comprising a metal layer comprising at least one element selected from the group consisting of Fe, Ni, Cu, Sn, and Al, and resin layers sandwiching the metal layer therebetween.

7. A battery pack comprising the nonaqueous electrolyte battery according to claim 1 .

8. The battery pack according to claim 7 , wherein the battery pack comprises five of the nonaqueous electrolyte batteries connected to each other in series.

9. The battery pack according to claim 7 , wherein the battery pack comprises a plurality of battery modules, each of which comprises five of the nonaqueous electrolyte batteries connected to each other in series, and
the plurality of battery modules is connected to each other in series, in parallel, or by combining a series connection and a parallel connection.

10. The nonaqueous electrolyte battery according to claim 1 , wherein the ratio of the weight of the second positive electrode active material in the positive electrode to the weight of the first positive electrode active material is 0.02 or more and 0.04 or less.

11. The nonaqueous electrolyte battery according to claim 3 , wherein the negative electrode active material is selected from the group consisting of lithium-titanium composite oxide having a spinel-type crystal structure, lithium-titanium composite oxide having a ramsdellite-type structure, monoclinic titanium dioxide, and monoclinic niobium-titanium composite oxide.

12. The nonaqueous electrolyte battery according to claim 1 , wherein a is 0.

13. The nonaqueous electrolyte battery according to claim 1 , wherein x is within a range of 0.3 or more and 0.55 or less.

14. The nonaqueous electrolyte battery according to claim 1 , wherein M is Al.

15. The nonaqueous electrolyte battery according to claim 1 , wherein a is 0, x is within a range of 0.3 or more and 0.55 or less, and M is Al.

16. The nonaqueous electrolyte battery according to claim 11 , wherein a is 0, x is within a range of 0.3 or more and 0.55 or less, and M is Al.

Assignees

• Toshiba Kk

Inventors

• Kuriyama Hiromichi
• Yoshikawa Hikaru
• Saruwatari Hidesato
• Murashi Yasuaki
• Yamamoto Dai
• Nishio Naoki

Classifications

• H01M50/209

  adapted for prismatic or rectangular cells (H01M50/216 takes precedence) · CPC title

• H01M50/211

  adapted for pouch cells · CPC title

• H01M50/133

  Thickness · CPC title

• H01M50/129

  with two or more layers of only organic material · CPC title

• H01M50/119

  Metals · CPC title