Battery system, method for producing battery system, and battery control apparatus

• US 9,484,596 B2
• Filed: 05/14/2013
• Issued: 11/01/2016
• Est. Priority Date: 06/20/2012
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Otomo, Takamasa, Kawamoto, Koji, Kato, Yuki
• Primary Examiner(s): Barcena, Carlos
• Application Number:
  US14/409,224
• Publication Number:
  US 20150147597A1
• Time in Patent Office: 1,267 Days
• US Class Current: 1/1
• CPC Class Codes: C01B 25/14 Sulfur, selenium, or tellurium compounds of phosphorus
• CPC Class Codes: C01P 2002/72 by d-values or two theta-values, e.g. as X-ray diagram
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0562 Solid materials
• CPC Class Codes: H01M 10/425 Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing printed circuits H05K1/00
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 2010/4271 Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
• CPC Class Codes: H01M 2300/0068 inorganic
• CPC Class Codes: H01M 4/134 Electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/386 Silicon or alloys based on silicon
• CPC Class Codes: H01M 4/62 Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

The object of the present invention is to provide a battery system in which reductive decomposition of a Ge-containing solid electrolyte material is restricted. The present invention attains the object by providing a battery system including a battery and a control apparatus, wherein the battery has a cathode active material layer containing a cathode active material, an anode active material layer containing a Si-containing anode active material, and an electrolyte layer formed between the cathode active material layer and the anode active material layer, at least one of the anode active material layer and the electrolyte layer contains a Ge-containing solid electrolyte material, and the control apparatus is an apparatus to control an electric potential of the Si-containing anode active material so as to be reduction potential or less of the Ge-containing solid electrolyte material.

Claims

1. A battery system comprising:

a battery comprising;

a cathode active material layer containing a cathode active material;

an anode active material layer containing a Si-containing anode active material; and

a solid electrolyte layer formed between the cathode active material layer and the anode active material layer,

wherein at least one of the anode active material layer and the solid electrolyte layer comprises a Ge-containing solid electrolyte material having a Li element, a Ge element, a P element, and a S element; and

a control apparatus that controls an electric potential of the Si-containing anode active material so as to be reduction potential or less of the Ge-containing solid electrolyte material.

2. The battery system according to claim 1, wherein the control apparatus comprises a switch part to cut off electric current of the battery, and controls the switch part so as to continue charge until the electric potential of the Si-containing anode active material becomes smaller than the reduction potential of the Ge-containing solid electrolyte material in the case where charge is started when the electric potential of the Si-containing anode active material is larger than the reduction potential of the Ge-containing solid electrolyte material.

3. The battery system according to claim 1, wherein the Ge-containing solid electrolyte material has a peak at a position of 2θ

=29.58°

±

0.50°

in X-ray diffraction measurement using a CuKα

line, and a value of I_B/I _A is less than 0.50,

wherein I_A represents a diffraction intensity at the peak of 2θ

=29.58°

±

0.50° and

I_B represents a diffraction intensity at a peak of 2θ

=27.33°

±

0.50°

.

4. The battery system according to claim 1, wherein:

the Ge-containing solid electrolyte material has an octahedron O composed of an M₁ element and a S element, a tetrahedron T₁ composed of an M_2a element and a S element, and a tetrahedron T₂ composed of an M_2b element and a S element,

the tetrahedron T₁ and the octahedron O share an edge,

the tetrahedron T₂ and the octahedron O comprise a crystal structure sharing a corner as a main body,

the M₁ is Li,

the M_2a and the M_2b are each independently at least one of P and Ge, and

at least one of the M_2a and the M_2b comprises Ge.

5. The battery system according to claim 1, wherein the control apparatus controls the electric potential of the Si-containing anode active material so as to be 0.25 V (vs. Li/Li⁺) or less.

6. The battery system according to claim 1, wherein the Si-containing anode active material is Si.

7. The battery system according to claim 1, wherein:

the solid electrolyte layer comprises the Ge-containing solid electrolyte material, and

the Ge-containing solid electrolyte material comprised in the solid electrolyte layer contacts with the Si-containing anode active material comprised in the anode active material layer.

8. A method for producing a battery system, the method comprising:

assembling a battery, the battery comprising;

a cathode active material layer containing a cathode active material,

an anode active material layer containing a Si-containing anode active material, and

a solid electrolyte layer formed between the cathode active material layer and the anode active material layer,

wherein at least one of the anode active material layer and the solid electrolyte layer comprises a Ge-containing solid electrolyte material having a Li element, a Ge element, a P element, and a S element; and

installing a control apparatus to control an electric potential of the Si-containing anode active material so as to be reduction potential or less of the Ge-containing solid electrolyte material.

9. A battery control apparatus configured to control an electric potential of a Si-containing anode active material so as to be reduction potential or less of a Ge-containing solid electrolyte material with respect to a battery, the battery having a cathode active material layer containing a cathode active material, an anode active material layer containing the Si-containing anode active material, and a solid electrolyte layer formed between the cathode active material layer and the anode active material layer, wherein at least one of the anode active material layer and the solid electrolyte layer comprises the Ge-containing solid electrolyte material having a Li element, a Ge element, a P element, and a S element.