# US 2014/0197800 A1 · Lithium solid state secondary battery system

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- Number: US 2014/0197800 A1
- Document ID: US20140197800A1
- Status: Published application
- Kind: A1
- Application number: 14/234,567
- Filed: 2011-07-26
- Published: 2014-07-17
- Earliest claimed: 2011-07-26
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Inventors: Hiroshi Nagase; Shigenori Hama
- Web page: https://patentgrep.com/patent/US20140197800A1

## CPC

- H01M 10/4257: {Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries}
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 10/052: Li-accumulators
- H01M 10/0562: Solid materials
- H01M 10/448: {End of discharge regulating measures}
- H02J 7/00: Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H01M 4/366: {as layered products}
- H01M 2300/0068: inorganic
- Y02E 60/10: Energy storage using batteries
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The main object of the present invention is to provide a lithium solid state secondary battery system capable of restoring the decrease of output characteristics of a lithium solid state secondary battery without deteriorating an anode. The present invention attains the above-mentioned object by providing a lithium solid state secondary battery system including a lithium solid state secondary battery and an overdischarge treating unit, wherein an anode active material layer of the above-mentioned lithium solid state secondary battery contains an anode active material and a sulfide solid electrolyte material containing Li, A (A is at least one kind of P, S, Ge, Al and B) and S and having an ortho-composition, and the above-mentioned anode current collector includes a metal.

## Claims

### Claim at position 1

1-8. (canceled)

### Claim 9

A lithium solid state secondary battery system comprising:
a lithium solid state secondary battery comprising a cathode having a cathode active material layer and a cathode current collector, an anode having an anode active material layer and an anode current collector, and a solid electrolyte layer formed between the cathode active material layer and the anode active material layer; and
an overdischarge treating unit for discharging until SOC of the lithium solid state secondary battery becomes in a lower state than 0%,
wherein the anode active material layer contains an anode active material and a sulfide solid electrolyte material containing Li, A (A is at least one kind of P, S, Ge, Al and B) and S and having an ortho-composition, and
the anode current collector comprises a metal.

### Claim 10

A lithium solid state secondary battery system comprising:
a lithium solid state secondary battery comprising a cathode having a cathode active material layer and a cathode current collector, an anode having an anode active material layer and an anode current collector, and a solid electrolyte layer formed between the cathode active material layer and the anode active material layer; and
an overdischarge treating unit for discharging until, in a case where a cathode potential before a cathode active material contained in the cathode active material layer emits a metal ion is regarded as Ep (V), a cathode potential becomes a lower electric potential than the Ep (V),
wherein the anode active material layer contains an anode active material and a sulfide solid electrolyte material containing Li, A (A is at least one kind of P, S, Ge, Al and B) and S and having an ortho-composition, and
the anode current collector comprises a metal.

### Claim 11

A lithium solid state secondary battery system comprising:
a lithium solid state secondary battery comprising a cathode having a cathode active material layer containing an active material with a battery reaction at 3 V or more with respect to an Li electric potential and a cathode current collector, an anode having an anode active material layer containing an Li-containing metal active material or a carbon active material and an anode current collector, and a solid electrolyte layer formed between the cathode active material layer and the anode active material layer; and
an overdischarge treating unit for discharging a voltage of the lithium solid state secondary battery to less than 2.5 V,
wherein the anode active material layer contains a sulfide solid electrolyte material containing Li, A (A is at least one kind of P, S, Ge, Al and B) and S and having an ortho-composition, and
the anode current collector comprises a metal.

### Claim 12 (depends on 9)

The lithium solid state secondary battery system according to claim 9, wherein the A of the sulfide solid electrolyte material is P.

### Claim 13 (depends on 10)

The lithium solid state secondary battery system according to claim 10, wherein the A of the sulfide solid electrolyte material is P.

### Claim 14 (depends on 11)

The lithium solid state secondary battery system according to claim 11, wherein the A of the sulfide solid electrolyte material is P.

### Claim 15 (depends on 9)

The lithium solid state secondary battery system according to claim 9, wherein the overdischarge treating unit is an external short circuit unit for externally short-circuiting the lithium solid state secondary battery.

### Claim 16 (depends on 10)

The lithium solid state secondary battery system according to claim 10, wherein the overdischarge treating unit is an external short circuit unit for externally short-circuiting the lithium solid state secondary battery.

### Claim 17 (depends on 11)

The lithium solid state secondary battery system according to claim 11, wherein the overdischarge treating unit is an external short circuit unit for externally short-circuiting the lithium solid state secondary battery.

### Claim 18 (depends on 9)

The lithium solid state secondary battery system according to claim 9, comprising a plurality of the lithium solid state secondary batteries, and a selection control unit for selectively controlling so that the overdischarge treating unit functions on only a part of the lithium solid state secondary batteries.

### Claim 19 (depends on 10)

The lithium solid state secondary battery system according to claim 10, comprising a plurality of the lithium solid state secondary batteries, and a selection control unit for selectively controlling so that the overdischarge treating unit functions on only a part of the lithium solid state secondary batteries.

### Claim 20 (depends on 11)

The lithium solid state secondary battery system according to claim 11, comprising a plurality of the lithium solid state secondary batteries, and a selection control unit for selectively controlling so that the overdischarge treating unit functions on only a part of the lithium solid state secondary batteries.

### Claim 21 (depends on 9)

The lithium solid state secondary battery system according to claim 9, wherein at least one of the cathode active material layer and the solid electrolyte layer contains the sulfide solid electrolyte material.

### Claim 22 (depends on 10)

The lithium solid state secondary battery system according to claim 10, wherein at least one of the cathode active material layer and the solid electrolyte layer contains the sulfide solid electrolyte material.

### Claim 23 (depends on 11)

The lithium solid state secondary battery system according to claim 11, wherein at least one of the cathode active material layer and the solid electrolyte layer contains the sulfide solid electrolyte material.

### Claim 24 (depends on 9)

The lithium solid state secondary battery system according to claim 9, wherein the cathode active material layer contains a cathode active material coated with an ion conductive oxide.

### Claim 25 (depends on 10)

The lithium solid state secondary battery system according to claim 10, wherein the cathode active material layer contains the cathode active material coated with an ion conductive oxide.

### Claim 26 (depends on 11)

The lithium solid state secondary battery system according to claim 11, wherein the cathode active material layer contains a cathode active material coated with an ion conductive oxide.