# US 2017/0288267 A1 · Method for Forming Liquid Electrolyte-Containing Gel Electrolyte Membrane and Electrode Assembly, and Gel Electrolyte Cell and Method for Forming the Same, and Gel Polymer Lithium-Ion Battery

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- Number: US 2017/0288267 A1
- Document ID: US20170288267A1
- Status: Published application
- Kind: A1
- Application number: 15/396,447
- Filed: 2016-12-31
- Published: 2017-10-05
- Earliest claimed: 2016-03-31
- Assignees: Interstellar Solid-State Li-ion Batteries Technology (Chengdu) Co., Ltd
- Inventors: Xiaoli Peng; Yong Xiang; Chengxu Mou; Li Xia; Wanjin Pu; Jinwei He
- Web page: https://patentgrep.com/patent/US20170288267A1

## 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 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- H01M 2300/0085: Immobilising or gelification of electrolyte
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
- Y02T 90/12: Electric charging stations
- Y02T 90/14: Plug-in electric vehicles
- 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
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The present disclosure provides a method for forming liquid electrolyte-containing gel electrolyte membrane and electrode assembly, and gel electrolyte cell and method for forming the same, and gel polymer lithium-ion battery. The method for forming the liquid electrolyte-containing gel electrolyte membrane, which includes the following steps, providing a cathode or an anode; forming a liquid mixture C and a liquid electrolyte D; forming a gel membrane on at least one surface of the cathode and/or the anode by the liquid mixture C; forming the liquid electrolyte-containing gel electrolyte membrane by the gel membrane absorbing the liquid electrolyte D. The electrode assembly, the gel electrolyte cell and the gel polymer lithium-ion battery obtained in the present disclosure have excellent liquid absorption performance of liquid electrolyte, a high electrolyte conductivity of 3 to 7*10−3S·cm−1, a wide electrochemical window.

## Claims

### Claim 1

A method for forming a liquid electrolyte-containing gel electrolyte membrane, comprising:
providing a cathode or an anode;
forming a liquid mixture C and a liquid electrolyte D;
forming a gel membrane on at least one surface of the cathode and/or the anode by the liquid mixture C; and
forming the liquid electrolyte-containing gel electrolyte membrane by the gel membrane absorbing the liquid electrolyte D;
wherein the liquid mixture C includes a liquid mixture A and a liquid mixture B, the liquid mixture A including a polymer matrix and an organic solvent, the liquid mixture B including an organic solvent and mixture additives, and the liquid electrolyte D includes a lithium salt, a plasticizer, and electrolyte additives.

### Claim 2 (depends on 1)

The method of claim 1, wherein the liquid mixture C comprises 0.1 to 80% by mass fraction of the polymer matrix and 10 to 99% by mass fraction of the organic solvent; and 0 to 50% by mass fraction of the mixture additives,
the liquid electrolyte D comprises 0.1 to 50% by mass fraction of the lithium salt and 0.5 to 89% by mass fraction of the plasticizer, and 0 to 50% by mass fraction of the electrolyte additives.

### Claim 3 (depends on 1)

The method of claim 1, wherein the liquid mixture C comprises 0.1 to 20% by mass fraction of the polymer matrix and 60 to 90% by mass fraction of the organic solvent; and 0 to 10% by mass fraction of the mixture additives,
the liquid electrolyte D comprises 0.1 to 20% by mass fraction of the lithium salt and 5 to 20% by mass fraction of the plasticizer, and 0 to 10% by mass fraction of the electrolyte additives.

### Claim 4 (depends on 1)

The method of claim 1, wherein the gel membrane is formed on at least one surface of the cathode and/or the anode by the liquid mixture C by the following steps:
applying the liquid mixture C on at least one surface of the cathode and/or the anode;
drying the cathode and/or the anode at a temperature of −10 to 120° C. under a pressure of −5 to 5 Mpa, for 30 s to 24 h to form the gel membrane.

### Claim 5 (depends on 4)

The method of claim 4, wherein the drying step is carried out in
a vacuum oven, and automatic ventilation is carried out for 0 to 100 times during drying in the vacuum oven to keep the organic solvent in the vacuum oven out of the oven.

### Claim 6 (depends on 1)

The method of claim 1, wherein the liquid electrolyte-containing gel electrolyte membrane is formed by immersing the cathode and/or the anode with gel membrane formed thereon in the liquid electrolyte D for 1 s to 24 h.

### Claim 7 (depends on 1)

The method of claim 1, wherein the liquid electrolyte-containing gel electrolyte membrane is formed by the following steps:
forming a cell without containing liquid electrolyte by packaging the cathode and the anode with the gel membrane formed thereon sandwiched between the cathode and the anode; and
injecting the liquid electrolyte D to the gel membrane of the cell.

### Claim 8 (depends on 1)

The method of claim 1, wherein the polymer matrix is one or more materials selected from the following groups of polyvinyl chloride, chlorinated polyvinyl chloride, polystyrene, polyethylene oxide, polymethylmethacrylate, polyvinylidene fluoride, polyacrylonitrile, vinylidene fluoride-hexafluoropropylene copolymer, polyethylene, methyl methacrylate, and thermoplastic acrylic resin;
the organic solvent is one or more materials selected from the following groups of: acetone, N-methylpyrrolidone, anhydrous ethanol, dimethyl sulfoxide, dimethylformamide, tetrahydrofuran, and ethyl acetate;
the lithium salt is one or more materials selected from the following groups of: lithium hexafluorophosphate, lithium perchlorate, lithium hexafluoroarsenate, lithium tetrafluoroborate, lithium tetrachloroaluminate, lithium bistrifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium diboxylate, lithium tetrafluoroborate, lithium difluoroborate oxalate, lithium perfluoromethanesulfonate, lithium fluoride, lithium carbonate, and lithium chloride.

### Claim 9

An electrode assembly comprising:
a cathode and/or an anode; and
a liquid electrolyte-containing gel electrolyte membrane formed on at least one surface of the cathode and/or the anode; the liquid electrolyte-containing gel electrolyte membrane been formed by a liquid mixture C forming a gel membrane on the at least one surface of the cathode and/or the anode and absorbing a liquid electrolyte D, wherein the liquid mixture C includes a liquid mixture A and a liquid mixture B, the liquid mixture A including a polymer matrix and an organic solvent, the liquid mixture B including an organic solvent and mixture additives, and the liquid electrolyte D includes a lithium salt, a plasticizer, and electrolyte additives.

### Claim 10 (depends on 9)

The electrode assembly of claim 9, wherein the gel membrane has porous mesh structure, and a thickness of 10 to 200 μm.

### Claim 11 (depends on 9)

The electrode assembly of claim 9, wherein the gel membrane has an electrolyte retention of up to 95%.

### Claim 12

A method for forming a gel electrolyte cell, comprising:
providing a cathode and an anode:
forming a liquid mixture C and a liquid electrolyte D;
forming a gel membrane on at least one surface of the cathode and/or the anode by the liquid mixture C;
forming a liquid electrolyte-containing gel electrolyte membrane by the gel membrane absorbing the liquid electrolyte D;
forming the gel electrolyte cell by the liquid electrolyte-containing gel electrolyte membrane;
wherein the liquid mixture C includes a liquid mixture A and a liquid mixture B, the liquid mixture A including a polymer matrix and an organic solvent, the liquid mixture B including an organic solvent and mixture additives, and the liquid electrolyte D includes a lithium salt, a plasticizer, and electrolyte additives.

### Claim 13 (depends on 12)

The method of claim 12, wherein
the cathode and/or the anode may be cut and pretreated prior to form a gel membrane on at least one surface of the cathode and/or the anode by the liquid mixture C.

### Claim 14 (depends on 12)

The method of claim 12, wherein the liquid electrolyte-containing gel electrolyte membrane is formed by immersing the cathode and/or the anode with gel membrane formed thereon in the liquid electrolyte D for 1 s to 24 h.

### Claim 15 (depends on 12)

The method of claim 12, wherein the liquid electrolyte-containing gel electrolyte membrane is formed by the following steps:
forming a cell without containing liquid electrolyte by packaging the cathode and the anode with the gel membrane formed thereon sandwiched between the cathode and the anode; and
injecting the liquid electrolyte D to the gel membrane of the cell.

### Claim 16

A gel electrolyte cell, comprising:
a cathode and an anode, and a liquid electrolyte-containing gel electrolyte membrane sandwiched between the cathode and the anode, the liquid electrolyte-containing gel electrolyte membrane been formed by a liquid mixture C forming a gel membrane on at least one surface of the cathode and/or the anode, and absorbing a liquid electrolyte D, wherein the liquid mixture C includes a liquid mixture A and a liquid mixture B, the liquid mixture A including a polymer matrix and an organic solvent, the liquid mixture B including an organic solvent and mixture additives, and the liquid electrolyte D includes a lithium salt, a plasticizer, and electrolyte additives.

### Claim 17

A gel polymer lithium-ion battery, comprising:
a gel electrolyte cell, wherein the gel electrolyte cell includes a cathode, an anode, and a liquid electrolyte-containing gel electrolyte membrane sandwiched between the cathode and the anode, the liquid electrolyte-containing gel electrolyte membrane been formed by a liquid mixture C forming a gel membrane on at least one surface of the cathode and/or the anode, and absorbing a liquid electrolyte D, wherein the liquid mixture C includes a liquid mixture A and a liquid mixture B, the liquid mixture A including a polymer matrix and an organic solvent, the liquid mixture B including an organic solvent and mixture additives, and the liquid electrolyte D includes a lithium salt, a plasticizer, and electrolyte additives.