Nonaqueous electrolyte battery and battery pack

Patent metadata

Field	Value
Publication number	US-9543614-B2
Application number	US-201514659804-A
Country	US
Kind code	B2
Filing date	Mar 17, 2015
Priority date	Jul 31, 2014
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

According to one embodiment, a nonaqueous electrolyte battery includes a container, a positive electrode housed in the container, a negative electrode housed in the container, and a nonaqueous electrolyte housed in the container. The positive electrode includes a positive electrode active material represented by a general formula LiMO 2 (M is one or more elements selected from a group consisting of Ni, Co, and Mn). The negative electrode is spatially separated from the positive electrode and includes a titanium-containing oxide as a negative electrode active material. A potential of the positive electrode is 3.75 V or more vs. Li/Li + , when an open circuit voltage of a nonaqueous electrolyte battery is 2.17 V.

First claim

What is claimed is:

1. A nonaqueous electrolyte battery comprising:
a container;
a positive electrode housed in the container, the positive electrode comprising a positive electrode active material represented by a general formula LiMO 2 where M is one or more elements selected from a group consisting of Ni, Co, and Mn;
a negative electrode housed in the container, the negative electrode being spatially separated from the positive electrode and including a titanium-containing oxide as a negative electrode active material; and
a nonaqueous electrolyte housed in the container, wherein
a potential of the positive electrode is 3.75 V or more vs. Li/Li + , when an open circuit voltage of the nonaqueous electrolyte battery is 2.17 V, and wherein
the titanium-containing oxide comprises a spinel type lithium-titanium composite oxide and an orthorhombic crystal β-type titanium composite oxide, and a ratio w 1 /w 2 is ⅔ or more, where w 1 is a weight of the orthorhombic crystal β-type titanium composite oxide relative to an area of the negative electrode and w 2 is a weight of the spinel type lithium-titanium composite oxide relative to an area of the negative electrode.

2. The nonaqueous electrolyte battery according to claim 1 , wherein the titanium-containing oxide comprises one oxide selected from the group consisting of a spinel type lithium-titanium composite oxide, orthorhombic crystal β-type titanium composite oxide, monoclinic crystal niobium-titanium composite oxide, ramsdellite type lithium-titanium composite oxide, hollandite type lithium-titanium composite oxide, anatase type titanium composite oxide, and rutile type titanium composite oxide.

3. The nonaqueous electrolyte battery according to claim 1 , wherein when a discharge capacity per unit weight of the positive electrode active material during discharge of the positive electrode from a potential of 3.75 V vs. Li/Li + to a cutoff potential of 1.5 V vs. Li/Li + at a discharge rate of 0.1 C is Qc, and a discharge capacity per unit weight of the negative electrode active material during discharge of the negative electrode from a potential of 1.58 V vs. Li/Li + to a cutoff potential of 2.0 V vs. Li/Li + at a discharge rate of 0.1 C is Qa, a ratio of a weight of the positive electrode active material to a weight of the negative electrode active material is smaller than Qa/Qc.

4. The nonaqueous electrolyte battery according to claim 1 , wherein the titanium-containing oxide comprises a spinel type lithium-titanium composite oxide and a monoclinic crystal niobium-titanium composite oxide, and a ratio w 1 /w 2 is ⅓ or more, where w 1 is a weight of the monoclinic crystal niobium-titanium composite oxide relative to an area of the negative electrode and w 2 is a weight of the spinel type lithium-titanium composite oxide relative to an area of the negative electrode.

5. The nonaqueous electrolyte battery according to claim 1 , wherein the container is formed from a laminate film.

6. A battery pack comprising one or more of the nonaqueous electrolyte battery according to claim 1 .

7. A battery pack comprising 6 n or 5 n of the nonaqueous electrolyte battery according to claim 1 , the nonaqueous electrolyte batteries connected in a series, and n being 1 or greater.

8. The battery pack according to claim 6 , further comprising: a plurality of nonaqueous electrolyte batteries that are electrically connected; and a protective circuit capable of detecting a voltage of each of the nonaqueous electrolyte batteries.

9. A vehicle comprising the battery pack according to claim 6 .

10. A battery pack comprising a plurality of nonaqueous electrolyte batteries according to claim 1 connected in a series.

11. The nonaqueous electrolyte battery according to claim 1 , wherein the negative electrode active material comprises 40 wt. % orthorhombic β type TiO 2 (B) and 60 wt. % spinel type Li 4 Ti 5 O 12 .

Assignees

• Toshiba Kk

Inventors

• Sasakawa Tetsuya
• Isozaki Yoshiyuki
• Saruwatari Hidesato
• Takami Norio

Classifications

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M4/505

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

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M2/1077

  Electricity · mapped topic

• H01M4/364

  as mixtures · CPC title