# US 2026/0074301 A1 · Modified solid electrolyte, preparation method thereof, solid-state battery, and electric apparatus

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- Number: US 2026/0074301 A1
- Document ID: US20260074301A1
- Status: Published application
- Kind: A1
- Application number: 19/291,240
- Filed: 2025-08-05
- Published: 2026-03-12
- Earliest claimed: 2023-05-04
- Assignees: Contemporary Amperex Technology Co., Limited
- Applicants: Contemporary Amperex Technology Co., Limited
- Inventors: Ziyang NING; Chengyong LIU; Bobing HU; Chengbin ZHONG
- Web page: https://patentgrep.com/patent/US20260074301A1

## CPC

- H01M 10/052: Li-accumulators
- H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)}
- H01M 10/0562: Solid materials
- B60L 50/64: Constructional details of batteries specially adapted for electric vehicles
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- H01M 2300/0068: inorganic
- H01M 2300/0071: Oxides
- H01M 2300/008: Halides
- H01M 2300/0091: in the form of mixtures
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A modified solid electrolyte, a preparation method thereof, a solid-state battery, and an electric apparatus are disclosed. Components of the modified solid electrolyte include a solid electrolyte substrate and a phase-transforming toughening agent dispersed within the solid electrolyte substrate; and in the modified solid electrolyte, the phase-transforming toughening agent is primarily dispersed at grain boundaries of the solid electrolyte; where the phase-transforming toughening agent is capable of phase transformation under the action of an external force.

## Claims

### Claim 1

A modified solid electrolyte, wherein components of the modified solid electrolyte comprise a solid electrolyte substrate and a phase-transforming toughening agent dispersed within the solid electrolyte substrate, and in the modified solid electrolyte, the phase-transforming toughening agent is primarily dispersed at grain boundaries of the solid electrolyte; wherein
the phase-transforming toughening agent is capable of phase transformation under the action of an external force.

### Claim 2 (depends on 1)

The modified solid electrolyte according to claim 1, wherein among the total number of particles of the phase-transforming toughening agent in the modified solid electrolyte, a proportion of particles of the phase-transforming toughening agent dispersed at the grain boundaries of the solid electrolyte is ≥50%.

### Claim 3 (depends on 1)

The modified solid electrolyte according to claim 1, wherein in a cross-section of the modified solid electrolyte, the total number of particles of the phase-transforming toughening agent is N1, the number of particles of the phase-transforming toughening agent dispersed at the grain boundaries within the cross-section is N2, and then an orientation degree A of the phase-transforming toughening agent along the grain boundaries is A=N2/N1×100%, wherein A satisfies: A≥50%;
optionally, A satisfies: 50%<A≤100%; or
optionally, A satisfies: 50%<A<100%.

### Claim 4 (depends on 3)

The modified solid electrolyte according to claim 3, wherein the cross-section is a transverse cross-section or a longitudinal cross-section of the modified solid electrolyte.

### Claim 5 (depends on 3)

The modified solid electrolyte according to claim 3, wherein steps for testing the orientation degree A comprise:
taking a test sample of the modified solid electrolyte, and cutting the test sample along a direction perpendicular to a thickness direction of the test sample, wherein a cutting cross-section formed by cutting the test sample is a transverse cross-section to be tested;
using an X-ray energy dispersive spectrometer to identify a key element contained in the phase-transforming toughening agent in the transverse cross-section to be tested so as to cause the key element to emit signal points, and obtaining a scanning electron microscope image of the transverse cross-section to be tested;
obtaining the total number M1 of signal points in the scanning electron microscope image and the number M2 of signal points contained at the grain boundaries in the scanning electron microscope image; and
calculating A based on M1 and M2; wherein
the key element is an element contained in the phase-transforming toughening agent but not contained in the solid electrolyte substrate.

### Claim 6 (depends on 5)

The modified solid electrolyte according to claim 5, wherein the phase-transforming toughening agent contains zirconium oxide, and the key element is zirconium.

### Claim 7 (depends on 6)

The modified solid electrolyte according to claim 6, wherein the phase-transforming toughening agent further contains a stabilizer, and in the phase-transforming toughening agent, a mass proportion of the stabilizer is 0.01% to 50%;
optionally, the stabilizer contains at least one element of yttrium, scandium, magnesium, calcium, and cesium;
optionally, the stabilizer comprises at least one of yttrium oxide, scandium oxide, magnesium oxide, calcium oxide, and cesium oxide; or
optionally, the stabilizer comprises yttrium oxide.

### Claim 8 (depends on 1)

The modified solid electrolyte according to claim 1, wherein, in the modified solid electrolyte, a mass proportion of the phase-transforming toughening agent is 2% to 25%;
optionally, the mass proportion of the phase-transforming toughening agent is 5% to 25%;
optionally, the mass proportion of the phase-transforming toughening agent is 10% to 25%; or
optionally, the mass proportion of the phase-transforming toughening agent is 15% to 25%.

### Claim 9 (depends on 1)

The modified solid electrolyte according to claim 1, wherein, in the modified solid electrolyte, mass of the solid electrolyte substrate is m1 with a theoretical density of ρ1, mass of the phase-transforming toughening agent is m2 with a theoretical density of ρ2, and then a theoretical volume Vt of the modified solid electrolyte satisfies: Vt=[m1/ρ1]+[m2/ρ2]; and
an actual volume of the modified solid electrolyte is Vr, and then density K of the modified solid electrolyte is K=Vt/Vr×100%; wherein
optionally, K satisfies: K≥70%; or optionally, K satisfies: 90%≤K≤100%.

### Claim 10 (depends on 1)

The modified solid electrolyte according to claim 1, wherein the solid electrolyte substrate comprises any one of a lithium-ion solid electrolyte, a sodium-ion solid electrolyte, and a potassium-ion solid electrolyte.

### Claim 11

A preparation method for a modified solid electrolyte, comprising the steps of:
mixing a solid electrolyte substrate and a phase-transforming toughening agent to prepare a mixture; and
subjecting the mixture to sintering treatment under a protective gas atmosphere to prepare the modified solid electrolyte.

### Claim 12 (depends on 11)

The preparation method for a modified solid electrolyte according to claim 11, wherein the sintering treatment satisfies at least one of the following conditions (1) and (2):
(1) a temperature for the sintering treatment is 90° C. to 600° C., and a duration is 10 min to 120 h; and
(2) the protective gas atmosphere is formed by introducing a protective gas, wherein the protective gas comprises at least one of an inert gas and nitrogen;
optionally, the protective gas comprises helium; or
optionally, a water content of the protective gas is <0.1 ppm, and an oxygen content is <0.1 ppm.

### Claim 13 (depends on 11)

The preparation method for a modified solid electrolyte according to claim 11, wherein after the sintering treatment, the method further comprises a step of pressing a product obtained from the sintering treatment; wherein
optionally, pressure T1 used in the pressing step satisfies: T1≥400 MPa; or
optionally, T1 satisfies: 400 MPa≤T1≤600 MPa.

### Claim 14 (depends on 11)

The preparation method for a modified solid electrolyte according to claim 11, wherein the mixing step employs dry mixing, and before the subjecting the mixture to sintering treatment, the method further comprises the following step:
pressing the mixture into a sheet-like mixture; wherein optionally, a thickness of the sheet-like mixture is 200 μm to 2 mm; and optionally, a pressure used for pressing the mixture into a sheet-like mixture is 400 to 600 MPa; or
the mixing step employs wet mixing, and before the subjecting the mixture to sintering treatment, the method further comprises the following step:
applying and drying the mixture to form a film-like mixture; wherein optionally, a thickness of the film-like mixture is 10 μm to 200 μm.

### Claim 15 (depends on 1)

A solid-state battery, wherein the solid-state battery comprises the modified solid electrolyte according to claim 1.

### Claim 16 (depends on 11)

A solid-state battery, wherein the solid-state battery comprises the modified solid electrolyte prepared using the preparation method according to claim 11.

### Claim 17 (depends on 15)

An electric apparatus, wherein the electric apparatus comprises the solid-state battery according to claim 15.