# US 12,183,883 B2 · Solid electrolyte and polymer lithium ion battery

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- Number: US 12,183,883 B2
- Document ID: US12183883B2
- Status: Granted
- Kind: B2
- Application number: 17/434,016
- Filed: 2020-04-10
- Published: 2022-05-05
- Granted: 2024-12-31
- Earliest claimed: 2019-04-10
- Assignees: Shenzhen Capchem Technology Co., Ltd.
- Applicants: Shenzhen Capchem Technology Co., Ltd.
- Inventors: Zhongbo Liu; Yuanyuan Kang; Furen Zheng; Yonghong Deng
- Web page: https://patentgrep.com/patent/US12183883B2

## CPC

- H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/056: characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M 2300/0068: inorganic
- H01M 2300/0071: Oxides
- H01M 2300/0082: Organic polymers
- H01M 2300/0085: Immobilising or gelification of electrolyte
- 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
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

In order to overcome the problem of low ionic conductivity in the existing polymer solid electrolyte, the disclosure provides a solid electrolyte, comprising a polymer, a lithium salt and an additive, the additive is selected from an aprotic organic solvent with a carbon number lower than 10 and a relative dielectric constant higher than 3.6; the mass content of the lithium salt is 30%˜90%, and the mass content of the additive is 0.01%˜2%, based on the total mass of the solid electrolyte being 100%. Further provided is a polymer lithium ion battery comprising the solid electrolyte. According to the solid electrolyte of the disclosure, a trace amount of small molecule aprotic organic solvent with high dielectric constant is introduced as an additive, which can inhibit crystallization of the solid electrolyte, promote transmission of lithium ions in the electrolyte, and improve the ionic conductivity of the solid electrolyte at room temperature.

## Claims

### Claim 1

A solid electrolyte, used for polymer lithium ion batteries, having the quality of consisting of a polymer, a lithium salt, an additive, an inorganic filler and a porous structure supporting layer; wherein the additive is selected from an aprotic organic solvent with a carbon number lower than 10 and a relative dielectric constant higher than 3.6;
the mass content of the lithium salt is 30%˜90%, and the mass content of the additive is 0.01%˜2%, based on the total mass of the solid electrolyte being 100%; and
the porous structure supporting layer comprises a bacterial cellulose membrane.

### Claim 2 (depends on 1)

The solid electrolyte of claim 1, wherein the mass content of the lithium salt is 50%˜80% based on the total mass of the solid electrolyte being 100%.

### Claim 3 (depends on 1)

The solid electrolyte of claim 1, wherein the additive is selected from one or more of nitriles, sulfones, sulfoxides, sulfates, sulfites, sulfonates, ketones, ethers, carboxylates, carbonates, phosphates, borates, silicates and amides.

### Claim 4 (depends on 1)

The solid electrolyte of claim 1, wherein the additive is selected from one or more of dimethyl sulfoxide, sulfolane, 1,3-propane sultone, γ-butyrolactone, ethyl acetate, trimethyl borate, trimethyl phosphate, dimethyl oxalate, dimethyl carbonate, ethylene carbonate, propylene carbonate, N-methylpyrrolidone, acetone, methyl ethyl ketone, tetrahydrofuran, 1,3-dioxolane, ethylene glycol dimethyl ether, acetonitrile and succinonitrile.

### Claim 5 (depends on 1)

The solid electrolyte of claim 1, wherein the dielectric constant of the polymer is greater than 2.

### Claim 6 (depends on 1)

The solid electrolyte according to claim 1, wherein the polymer is selected from one or more of a homopolymer or a copolymer containing a halogenated or unhalogenated repeating unit; wherein the repeating unit is selected from one or more of a halogenated or unhalogenated alkylene oxide compound, a halogenated or unhalogenated siloxane compound, a halogenated or unhalogenated olefin compound, a halogenated or unhalogenated acrylate compound, a halogenated or unhalogenated carboxylic acid ester compound, a halogenated or unhalogenated carbonate compound, a halogenated or unhalogenated amide compound and a halogenated or unhalogenated cyano-containing compound.

### Claim 7 (depends on 1)

The solid electrolyte of claim 1, wherein the weight-average molecular weight of the polymer is 1,000˜10,000,000.

### Claim 8 (depends on 1)

The solid electrolyte of claim 1, wherein the lithium salt comprises one or more of LiBr, LiI, LiCIO4, LiBF4, LiPF6, LiSCN, LiB10C110, LiCF3SO3, LiCF3CO2, LiBF2C2O4, LiB(C2O4)2, LiN(SO2CF3)2, LiN(SO2F)2, LiN(SO2F)(SO2CF3), LiC(SO2CF3)3 and LiPF2(C2O4).

### Claim 9 (depends on 1)

The solid electrolyte of claim 1, wherein the mass content of the inorganic filler is less than or equal to 40% based on the total mass of the solid electrolyte being 100%, and the inorganic filler comprises one or more of LIF, LiCl, Li2CO3, SiO2, Al2O3, TiO2, ZrO2, MgO, Li7La3Zr2O12, LixLa3ZryA2-yO12, sulfide electrolyte, Li1.3Al0.3 Ti1.7(PO4)3, Li1.5Al0.5Ge1.5(PO4)3, Li2.88PO3.73N0.14, montmorillonite, kaolin and diatomite, wherein, in LixLa3ZryA2-yO12, A is selected from one of Ta, Al and Nb, 6≤x≤7, 0.5≤y≤2.

### Claim 10 (depends on 1)

A polymer lithium ion battery, comprising a positive electrode, a negative electrode and the solid electrolyte of claim 1.

### Claim 11 (depends on 2)

A polymer lithium ion battery, comprising a positive electrode, a negative electrode and the solid electrolyte of claim 2.

### Claim 12 (depends on 3)

A polymer lithium ion battery, comprising a positive electrode, a negative electrode and the solid electrolyte of claim 3.

### Claim 13 (depends on 4)

A polymer lithium ion battery, comprising a positive electrode, a negative electrode and the solid electrolyte of claim 4.

### Claim 14 (depends on 5)

A polymer lithium ion battery, comprising a positive electrode, a negative electrode and the solid electrolyte of claim 5.

### Claim 15 (depends on 6)

A polymer lithium ion battery, comprising a positive electrode, a negative electrode and the solid electrolyte of claim 6.

### Claim 16 (depends on 7)

A polymer lithium ion battery, comprising a positive electrode, a negative electrode and the solid electrolyte of claim 7.

### Claim 17 (depends on 8)

A polymer lithium ion battery, comprising a positive electrode, a negative electrode and the solid electrolyte of claim 8.

### Claim 18 (depends on 9)

A polymer lithium ion battery, comprising a positive electrode, a negative electrode and the solid electrolyte of claim 9.