Lithium-ion battery and apparatus containing same

Patent metadata

Field	Value
Publication number	US-12537203-B2
Application number	US-202217814834-A
Country	US
Kind code	B2
Filing date	Jul 26, 2022
Priority date	Jun 3, 2020
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

A lithium-ion battery and an apparatus containing the same are provided. In some embodiments, the lithium-ion battery includes: a positive electrode plate including a positive electrode current collector and a positive electrode active substance layer; and an electrolyte including a non-aqueous organic solvent. A low-swelling adhesive layer and an oily adhesive layer are sequentially arranged between the positive electrode current collector and the positive electrode active substance layer; the low-swelling adhesive layer includes a low-swelling binder, and the oily adhesive layer includes a first binder, where a solubility parameter SP 1 of the low-swelling binder is less than a solubility parameter SP 2 of the first binder.

First claim

What is claimed is:

1 . A lithium-ion battery, comprising:
a positive electrode plate comprising a positive electrode current collector and a positive electrode active substance layer; and an electrolyte comprising a non-aqueous organic solvent; and, wherein an adhesive layer and an oily adhesive layer are sequentially arranged between the positive electrode current collector and the positive electrode active substance layer, wherein the adhesive layer comprises a binder, the binder comprises polystyrene or propylene modified acrylate, and the oily adhesive layer comprises a first binder selected from one or more of carboxylic acid modified polyvinylidene fluoride PVDF and carboxylic acid modified polyvinylidene chloride PVDC, wherein a solubility parameter SP 1 of the binder is less than a solubility parameter SP 2 of the first binder, the solubility parameter SP 1 of the binder is 13 (J/cm 3 ) 1/2 −18(J/cm 3 ) 1/2 .

2 . The lithium-ion battery according to claim 1 , wherein the solubility parameter SP 1 of the binder is less than a solubility parameter SP 0 of the non-aqueous organic solvent; and/or
an absolute value of a difference between the solubility parameter SP 2 of the first binder and the solubility parameter SP 0 of the non-aqueous organic solvent is ≤5 (J/cm 3 ) 1/2 .

3 . The lithium-ion battery according to claim 2 , wherein the solubility parameter SP 0 of the non-aqueous organic solvent is 20 (J/cm 3 ) 1/2 −25(J/cm 3 ) 1/2 .

4 . The lithium-ion battery according to claim 1 , wherein the solubility parameter SP 2 of the first binder is 20 (J/cm 3 ) 1/2 − 29 (J/cm 3 ) 1/2 .

5 . The lithium-ion battery according to claim 1 , wherein in the adhesive layer, a percentage of the binder is ≥40 wt %.

6 . The lithium-ion battery according to claim 1 , wherein the adhesive layer further comprises a conductive carbon material, and the conductive carbon material is selected from one or more of conductive carbon black and graphene.

7 . The lithium-ion battery according to claim 1 , wherein the carboxylic acid of the carboxylic acid modified polyvinylidene chloride PVDC is selected from acrylic acid and polyacrylic acid.

8 . The lithium-ion battery according to claim 1 , wherein the oily adhesive layer further comprises a first conductive material, and the first conductive material is selected from one or more of conductive carbon black, graphene, polypyrrole, and polyaniline.

9 . The lithium-ion battery according to claim 1 , wherein the oily adhesive layer further comprises an inorganic filler, and the inorganic filler is selected from one or more of magnesium oxide, aluminum oxide, titanium dioxide, zirconium oxide, silicon dioxide, silicon carbide, boron carbide, calcium carbonate, aluminum silicate, calcium silicate, potassium titanate, barium sulfate, lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium nickel aluminum manganese oxide, lithium iron phosphate, lithium vanadium phosphate, lithium cobalt phosphate, lithium manganese phosphate, lithium manganese ferric phosphate, lithium iron silicate, lithium vanadium silicate, lithium cobalt silicate, lithium manganese silicate, spinel-type lithium manganate, spinel-type lithium nickel manganate, lithium titanate, or these materials modified by conductive carbon coating, conductive metal coating, or conductive polymer coating.

10 . The lithium-ion battery according to claim 1 , wherein the positive electrode active substance layer comprises a positive electrode active substance, and the positive electrode active substance is selected from lithium-containing composite metal oxides; optionally, the positive electrode active substance is selected from one or more of lithium nickel cobalt manganese oxides and lithium nickel manganese oxides.

11 . The lithium-ion battery according to claim 1 , wherein the positive electrode active substance layer further comprises a binder selected from flexible chain modified polyvinylidene fluoride and chlorovinylidene fluoride, wherein the flexible chain is long-chain alkyl or alkoxy.

12 . The lithium-ion battery according to claim 1 , wherein a single-layer thickness T 1 of the adhesive layer, a single-layer thickness T 2 of the oily adhesive layer, and a single-layer thickness of the positive electrode active substance layer T 0 satisfy:
0.01≤(T 1 +T 2 )/T 0 ≤0.4.

13 . The lithium-ion battery according to claim 1 , wherein a single-layer thickness T 2 of the adhesive layer is 0.1 μm-5 μm.

14 . The lithium-ion battery according to claim 1 , wherein a single-layer thickness T 2 of the oily adhesive layer is 3 μm-15 μm.

15 . An apparatus, comprising the lithium-ion battery according to claim 1 .

16 . The apparatus according to claim 15 , wherein the apparatus comprises a mobile phone, a notebook computer, an electric vehicle, an electric vessel, or an energy storage system; optionally, the electric vehicle comprises a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, or an electric truck.

17 . The lithium-ion battery according to claim 1 , wherein the first binder of the oily adhesive layer is carboxylic acid modified polyvinylidene chloride PVDC.

Assignees

• Jiangsu Contemporary Amperex Tech Ltd

Inventors

• Cao Jingyu
• Liu Huihui
• Li Shisong
• Ma Lin

Classifications

• H01M10/0569

  characterised by the solvents · CPC title

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title