US 11,961,973 B2Granted

All-solid-state secondary battery

AssigneeToyota Jidosha Kabushiki Kaisha

InventorRyuto Sakamoto

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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.

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 solid electrolyte layer side are further inward than outer edges of the positive electrode active material layer on positive electrode collector layer side, and
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, 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 the 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 the 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
)
≤
450.0
(
1
)
(where x>0.0, y>0.0 and x−y>0.0).

83 more elements

Facts

Application

17/533,725Filed 23 Nov 2021

Priority

JP 2020-19827830 Nov 2020

Published

US 2022/0173440 A12 Jun 2022

Granted

16 Apr 2024

Term ends

Not estimatedThe source records don’t support an estimate.

Classification12 codes

H01M 10/0585
Construction or manufacture: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and…
H01M 4/131
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…
H01M 10/0525
Li-accumulators: rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
H01M 10/0562
The electrolyte being constituted of inorganic materials only: solid materials

Abstract

Claims9