Nonaqueous electrolyte battery, battery pack and vehicle

Patent metadata

Field	Value
Publication number	US-9786909-B2
Application number	US-201414302176-A
Country	US
Kind code	B2
Filing date	Jun 11, 2014
Priority date	Mar 28, 2007
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

A nonaqueous electrolyte battery includes a positive electrode, a negative electrode and a nonaqueous electrolyte. The negative electrode contains a lithium compound and a negative electrode current collector supporting the lithium compound. A log differential intrusion curve obtained when a pore size diameter of the negative electrode is measured by mercury porosimetry has a peak in a pore size diameter range of 0.03 to 0.2 μm and attenuates with a decrease in pore size diameter from an apex of the peak. A specific surface area (excluding a weight of the negative electrode current collector) of pores of the negative electrode found by mercury porosimetry is 6 to 100 m 2 /g. A ratio of a volume of pores having a pore size diameter of 0.05 μm or less to a total pore volume is 20% or more.

First claim

What is claimed is:

1. A nonaqueous electrolyte battery comprising:
a positive electrode;
a negative electrode comprising a negative electrode current collector; and
a nonaqueous electrolyte,
wherein a log differential intrusion curve obtained when a pore size diameter of the negative electrode is measured by mercury porosimetry has a peak in a pore size diameter range of 0.03 to 0.2 μm and attenuates with a decrease in pore size diameter from an apex of the peak,
a specific surface area (excluding a weight of the negative electrode current collector) of pores of the negative electrode found by mercury porosimetry is 6 to 100 m 2 /g, and
a ratio of a volume of pores having a pore size diameter of 0.05 μm or less to a total pore volume is 20% or more.

2. The nonaqueous electrolyte battery according to claim 1 , wherein a volume of pores measured by the mercury porosimetry is 0.1 to 0.5 mL per 1 g of the negative electrode, excluding the negative electrode current collector.

3. The nonaqueous electrolyte battery according to claim 1 , wherein the negative electrode comprises a compound which contains lithium when the compound is charged.

4. The nonaqueous electrolyte battery according to claim 1 , wherein the positive electrode comprises at least one kind of oxide selected from the group consisting of manganese dioxide, iron oxide, copper oxide, nickel oxide, lithium-manganese composite oxide, lithium-nickel composite oxide, lithium-cobalt composite oxide, lithium-nickel-cobalt composite oxide, lithium-manganese-cobalt composite oxide, lithium-manganese-nickel composite oxide, spinel-type lithium-manganese-nickel composite oxide, lithium phosphates having an olivine structure, iron sulfate and vanadium oxide.

5. The nonaqueous electrolyte battery according to claim 1 , wherein the peak exists in a pore size diameter range of 0.04 to 0.1 μm.

6. The nonaqueous electrolyte battery according to claim 1 , wherein the ratio is 20 to 90%.

7. A battery pack comprising a nonaqueous electrolyte battery, the nonaqueous electrolyte battery comprising:
a positive electrode;
a negative electrode comprising a negative electrode current collector; and
a nonaqueous electrolyte,
wherein a log differential intrusion curve obtained when a pore size diameter of the negative electrode is measured by mercury porosimetry has a peak in a pore size diameter range of 0.03 to 0.2 μm and attenuates with a decrease in pore size diameter from an apex of the peak,
a specific surface area (excluding a weight of the negative electrode current collector) of pores of the negative electrode found by mercury porosimetry is 6 to 100 m 2 /g, and
a ratio of a volume of pores having a pore size diameter of 0.05 μm or less to a total pore volume is 20% or more.

8. The battery pack according to claim 7 , wherein a volume of pores measured by mercury porosimetry is 0.1 to 0.5 mL per 1 g of the negative electrode, excluding a negative electrode current collector.

9. The battery pack according to claim 7 , wherein the negative electrode comprises a compound which contains lithium when the compound is charged.

10. The battery pack according to claim 7 , wherein the positive electrode comprises at least one kind of oxide selected from the group consisting of manganese dioxide, iron oxide, copper oxide, nickel oxide, lithium-manganese composite oxide, lithium-nickel composite oxide, lithium-cobalt composite oxide, lithium-nickel-cobalt composite oxide, lithium-manganese-cobalt composite oxide, lithium-manganese-nickel composite oxide, spinel-type lithium-manganese-nickel composite oxide, lithium phosphates having an olivine structure, iron sulfate and vanadium oxide.

11. The battery pack according to claim 7 , wherein the peak exists in a pore size diameter range of 0.04 to 0.1 μm.

12. The battery pack according to claim 7 , wherein the ratio is 20 to 90%.

13. A vehicle comprising the nonaqueous electrolyte battery according to claim 1 .

14. A negative electrode comprising:
a negative electrode current collector,
wherein a log differential intrusion curve obtained when a pore size diameter of the negative electrode is measured by mercury porosimetry has a peak in a pore size diameter range of 0.03 to 0.2 μm and attenuates with a decrease in pore size diameter from an apex of the peak,
a specific surface area (excluding a weight of the negative electrode current collector) of pores of the negative electrode found by mercury porosimetry is 6 to 100 m 2 /g, and
a ratio of a volume of pores having a pore size diameter of 0.05 μm or less to a total pore volume is 20% or more.

15. The negative electrode according to claim 14 , wherein a volume of pores measured by the mercury porosimetry is 0.1 to 0.5 mL per 1 g of the negative electrode, excluding the negative electrode current collector.

16. The negative electrode according to claim 14 , wherein the negative electrode comprises a compound which contains lithium when the compound is charged.

17. The negative electrode according to claim 14 , wherein the peak exists in a pore size diameter range of 0.04 to 0.1 μm.

18. The negative electrode according to claim 14 , wherein the ratio is 20 to 90%.

Assignees

• Toshiba Kk

Inventors

• Saruwatari Hidesato
• Morishima Hideaki
• Inagaki Hiroki
• Takami Norio

Classifications

• H01M10/48

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2004/021

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

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M4/131

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