ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, BATTERY PACK, AND VEHICLE

• US 20160372753A1
• Filed: 09/02/2016
• Published: 12/22/2016
• Est. Priority Date: 03/24/2014
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: FUKASAWA, Takayuki, ESSAKI, Kenji, MORITA, Tomokazu, KUBOKI, Takashi
• Granted Patent: US 10,511,026 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H01M 2300/0037 Mixture of solvents
• CPC Class Codes: H01M 4/134 Electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/362 Composites
• CPC Class Codes: H01M 4/386 Silicon or alloys based on silicon
• CPC Class Codes: H01M 4/483 for non-aqueous cells H01M4/485 takes precedence
• CPC Class Codes: H01M 4/587 for inserting or intercalating light metals
• CPC Class Codes: H01M 4/624 Electric conductive fillers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A negative electrode active material of an embodiment for a nonaqueous electrolyte battery includes silicon or silicon oxide including silicon inside, a carbonaceous substance containing the silicon or the silicon oxide including silicon inside, and a phase including a silicate compound and a conductive assistant, the phase being interposed between the silicon or the silicon oxide including silicon inside and the carbonaceous substance. The silicate compound is a complexed oxide including an oxide including at least one element selected from the group consisting of; an alkaline earth element, a transition metal element, and a rare-earth element and a silicon oxide.

Claims

1. A negative electrode active material for a nonaqueous electrolyte battery, comprising:

silicon or silicon oxide including silicon inside;

a carbonaceous substance containing the silicon or the silicon oxide including silicon inside; and

a phase including a silicate compound and a conductive assistant, the phase being interposed between the silicon or the silicon oxide including silicon inside and the carbonaceous substance,

wherein the silicate compound is a complexed oxide including an oxide including at least one element selected from the group consisting of;

an alkaline earth element, a transition metal element, and a rare-earth element and a silicon oxide.

2. The active material according to claim 1,

wherein the silicon or the silicon oxide including silicon inside accounts for 20 mass % or more to 75 mass % or less when mass of the active material according to claim 1 is defined as 100 mass %.

3. The active material according to claim 1,

wherein The silicate compound is at least one compound selected from the group consisting of;

MgSiO₃, Mg₂SiO₄, TiSiO₄, Mn₂SiO₄, FeSiO₃, Fe₂SiO₄, CO₂SiO₄, Ni₂SiO₄, Al₂SiO₅, ZrSiO₄, Y₂SiO₅, and Y₂Si₂O₇.

4. The active material according to claim 1,

wherein a mixture of the silicate compound and the conductive assistant is present in the phase including the silicate compound and the conductive assistant.

5. The active material according to claim 1,

wherein the conductive assistant includes at least one material selected from the group consisting of;

graphite, hard carbon, soft carbon, amorphous carbon, acetylene black, and silicon carbide.

6. The active material according to claim 1,

wherein amass mixing ratio between the silicate compound and the conductive assistant is between 10:

90 and 90;

10.

7. An negative electrode for a nonaqueous electrolyte secondary battery, comprising:

a collector; and

an electrode mixture layer on the collector, the electrode mixture layer including the negative electrode active material for a nonaqueous electrolyte battery according to claim 1, a conductive material, and a binder.

8. A nonaqueous electrolyte secondary battery comprising:

an exterior material;

a positive electrode housed in the exterior material;

a negative electrode spatially apart from the positive electrode, the negative electrode being housed in the exterior material with a separator interposed between the negative electrode and the positive electrode, the negative electrode including the electrode according to claim 7; and

a nonaqueous electrolyte filled in the exterior material.

9. A battery pack comprising the nonaqueous electrolyte secondary battery according to claim 8 as a cell.

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