# US 2025/0096321 A1 · High-voltage lithium-ion battery with a wide electrochemical window of polymer electrolytes

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- Number: US 2025/0096321 A1
- Document ID: US20250096321A1
- Status: Published application
- Kind: A1
- Application number: 18/468,736
- Filed: 2023-09-17
- Published: 2025-03-20
- Earliest claimed: 2023-09-17
- Assignees: City University of Hong Kong
- Applicants: City University of Hong Kong
- Inventors: Chunyi ZHI; Yue HOU
- Web page: https://patentgrep.com/patent/US20250096321A1

## CPC

- H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- Y02E 60/10: Energy storage using batteries
- 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

## Abstract

The present invention relates to a PVTF-based solid polymer electrolyte, comprising: a polymer matrix; a N,N-Dimethylformamide (DMF) solvent; and a lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). The PVTF-based solid polymer electrolyte demonstrates an exceptional electrochemical window of up to 5.68 V, a significantly higher ionic conductivity of 1.91×10−3 S cm−1 at ambient temperature, and the PVTF-based solid polymer electrolyte has a glass transition temperature (Tg) lower than −38° C.

## Claims

### Claim 1

A PVTF-based solid polymer electrolyte, comprising:
a polymer matrix;
a N, N-Dimethylformamide (DMF) solvent; and
lithium bis(trifluoromethanesulfonyl)imide (LiTFSI),
wherein the PVTF-based solid polymer electrolyte demonstrates an exceptional electrochemical window of up to 5.68 V, a significantly higher ionic conductivity of 1.91×10−3 S cm−1 at ambient temperature, and the PVTF-based solid polymer electrolyte has a glass transition temperature (Tg) lower than −38° C.

### Claim 2 (depends on 1)

The PVTF-based solid polymer electrolyte of claim 1, wherein the polymer matrix comprises PVTF with a mass of 0.1 g to 2 g, the LiTFSI has a mass of 0.1 g to 2 g and the DMF solvent has a volume of 1-10 mL.

### Claim 3 (depends on 1)

The PVTF-based solid polymer electrolyte of claim 1, wherein the PVTF-based solid polymer electrolyte further comprises a sacrificial additive.

### Claim 4 (depends on 1)

The PVTF-based solid polymer electrolyte of claim 1, wherein the sacrificial additive comprises lithium difluorophosphate (LiDFP) with a mass of 0.01-0.05 g.

### Claim 5

A high-voltage solid-state lithium-ion battery with a wide electrochemical window of polymer electrolytes, comprising:
a cathode material;
an anode material;
a solid polymer electrolyte,
wherein the high-voltage solid-state lithium-ion battery has a consistent cycling performance over 200 cycles at 0.5 C, along with an impressive high-capacity retention of 75%.

### Claim 6 (depends on 5)

The high-voltage solid-state lithium-ion battery of claim 5, wherein the cathode material comprises Ni-rich cathode material or lithium foil.

### Claim 7 (depends on 6)

The high-voltage solid-state lithium-ion battery of claim 6, wherein the Ni-rich cathode material comprises spinel LiNi0.5Mn1.5O4 (LNMO) particles.

### Claim 8 (depends on 7)

The high-voltage solid-state lithium-ion battery of claim 7, there is an amorphous conductive CEI layer that encapsulates LNMO particles.

### Claim 9 (depends on 8)

The high-voltage solid-state lithium-ion battery of claim 8, the CEI layer comprises an inner CEI and an outer CEI, and wherein the inner CEI comprises Li3PO4 and LiF.

### Claim 10 (depends on 8)

The high-voltage solid-state lithium-ion battery of claim 8, wherein the cathode comprising LNMO particles with the CEI layer exhibits improved rate performance, yielding respectable specific capacities of 137, 130, 125, 105, and 70 mAh g−1 recorded at 0.1, 0.2, 0.5, 1.0, and 2 C, respectively.

### Claim 11 (depends on 5)

The high-voltage solid-state lithium-ion battery of claim 5, wherein the anode material comprises lithium foil.

### Claim 12 (depends on 5)

The high-voltage solid-state lithium-ion battery of claim 5, wherein the anode and cathode further comprise a current collector, one or more active materials, one or more electronic conductive particles and one or more binders.

### Claim 13 (depends on 12)

The high-voltage solid-state lithium-ion battery of claim 12, wherein the current collector comprises aluminum foil or copper foil.

### Claim 14 (depends on 5)

The high-voltage solid-state lithium-ion battery of claim 5, wherein the high-voltage solid-state lithium-ion battery has a stable cycling lifespan of approximately 2400 hours at a current density of 0.1 mA cm−2 with a capacity of 0.1 mAh cm−2, demonstrating a very low overpotential of 55.7 mV.

### Claim 15 (depends on 5)

The high-voltage solid-state lithium-ion battery of claim 5, wherein the high-voltage solid-state lithium-ion battery achieves a long cycle life of approximately 1600 hours when the current density increased to 0.5 mA cm−2.