# US 12,191,454 B2 · All-solid-state secondary battery

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- Number: US 12,191,454 B2
- Document ID: US12191454B2
- Status: Granted
- Kind: B2
- Application number: 18/609,225
- Filed: 2024-03-19
- Published: 2024-07-04
- Granted: 2025-01-07
- Earliest claimed: 2020-11-30
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Ryuto Sakamoto
- Web page: https://patentgrep.com/patent/US12191454B2

## CPC

- H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0562: Solid materials
- H01M 2004/028: {Positive electrodes}
- H01M 2010/4292: {Aspects relating to capacity ratio of electrodes/electrolyte or anode/cathode}
- H01M 2300/0068: inorganic
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The all-solid-state secondary battery of the disclosure comprises a positive electrode collector layer, a positive electrode layer, a solid electrolyte layer, a negative electrode layer and a negative electrode collector layer stacked in that order, wherein the positive electrode layer has a positive electrode active material layer and an insulating layer disposed around the perimeter edges of the positive electrode active material layer, and when the all-solid-state secondary battery is viewed from the stacking direction, the outer edges of the positive electrode active material layer on the solid electrolyte layer side are further inward than the outer edges of the positive electrode active material layer on the positive electrode collector layer side, and the outer edges of the positive electrode collector layer are further inward than the outer edges of the positive electrode active material layer on the positive electrode collector layer side.

## Claims

### Claim 1

An all-solid-state secondary battery comprising a positive electrode collector layer, a positive electrode layer, a solid electrolyte layer, a negative electrode layer and a negative electrode collector layer stacked in that order, wherein:
the positive electrode layer has a positive electrode active material layer and an insulating layer disposed around perimeter edges of the positive electrode active material layer, and
when the all-solid-state secondary battery is viewed from a stacking direction,
outer edges of the positive electrode active material layer on a solid electrolyte layer side are further inward than outer edges of the positive electrode active material layer on a positive electrode collector layer side, and
outer edges of the positive electrode collector layer are further inward than outer edges of the positive electrode active material layer on a positive electrode collector layer side,
wherein in an arbitrary cross-section in the stacking direction of the all-solid-state secondary battery, with:
x mm denoting a shortest distance in a direction of a plane formed by an extension of the positive electrode active material layer on the positive electrode collector layer side and an extension of the positive electrode collector layer, and
y mm denoting a shortest distance in a direction of a plane formed by an extension of the positive electrode active material layer on the positive electrode collector layer side and an extension of the positive electrode active material layer on the solid electrolyte layer side, the following inequality (1) is satisfied:
Electron
⁢
conductivity
⁢
of
⁢
positive
⁢
electrode
⁢
active
⁢
material
⁢
layer
⁢
(
mS
/
cm
)
×
(
x
-
y
)
/
lithium
⁢
ion
⁢
conductivity
⁢
of
⁢
positive
⁢
electrode
⁢
active
⁢
material
⁢
layer
⁢
(
mS
/
cm
)
≤
450.
(
1
)
(where 5.0>x>0.0, 5.0>y>0.0 and x−y>0.0),
wherein the solid electrolyte layer comprises a sulfide solid electrolyte.

### Claim 2 (depends on 1)

The all-solid-state secondary battery according to claim 1, wherein:
when the all-solid-state secondary battery is viewed from the stacking direction, the outer edges of the positive electrode collector layer are further inward than the outer edges of the positive electrode active material layer on the solid electrolyte layer side.

### Claim 3 (depends on 1)

The all-solid-state secondary battery according to claim 1, wherein the electron conductivity is 1.000 to 200.000 mS/cm.

### Claim 4 (depends on 1)

The all-solid-state secondary battery according to claim 1, wherein the lithium ion conductivity is 0.001 to 0.500 mS/cm.

### Claim 5 (depends on 1)

The all-solid-state secondary battery according to claim 1, wherein a ratio of a capacity of the negative electrode layer with respect to a capacity of the positive electrode layer is 2.5 or greater.

### Claim 6 (depends on 1)

The all-solid-state secondary battery according to claim 1, which is a lithium ion secondary battery.

### Claim 7 (depends on 6)

The all-solid-state secondary battery according to claim 6, wherein a voltage of the negative electrode layer in a fully charged state is 0.5 V v.s. Li/Li+ or lower.