Electrode and secondary battery

Patent metadata

Field	Value
Publication number	US-2025079468-A1
Application number	US-202418950345-A
Country	US
Kind code	A1
Filing date	Nov 18, 2024
Priority date	May 19, 2022
Publication date	Mar 6, 2025
Grant date	—

Abstract

Provided is an electrode comprising an electrode active material layer and a polymer layer formed on the electrode active material layer, wherein the polymer layer comprises a copolymer comprising a fluoromonomer unit and an amide bond-containing monomer unit, and an inorganic particle.

First claim

1 . An electrode comprising an electrode active material layer and a polymer layer formed on the electrode active material layer, wherein the polymer layer comprises a copolymer comprising a fluoromonomer unit and an amide bond-containing monomer unit, and an inorganic particle.

2 . The electrode according to claim 1 , wherein the fluoromonomer is at least one selected from the group consisting of tetrafluoroethylene, hexafluoropropylene, chlorotrifluoroethylene, and 2,3,3,3-tetrafluoropropene.

3 . The electrode according to claim 1 , wherein the amide bond-containing monomer comprises a lactam ring.

4 . The electrode according to claim 1 , wherein the amide bond-containing monomer is N-vinyl-2-pyrrolidone.

5 . The electrode according to claim 1 , wherein a content of the fluoromonomer unit in the copolymer is 75 to 7 mol % based on all monomer units, and a content of the amide bond-containing monomer unit in the copolymer is 25 to 93 mol % based on all monomer units.

6 . The electrode according to claim 1 , wherein the inorganic particle comprises at least one element selected from the group consisting of Mg, Al, Si, Ti, Zr, and Ba.

7 . The electrode according to claim 1 , wherein a content proportion of the copolymer to the inorganic particle [(copolymer)/(inorganic particle)] in terms of mass ratio is 0.1/99.9 to 49.9/50.1.

8 . The electrode according to claim 1 , wherein the electrode active material layer comprises an electrode active material and a binder, and the binder comprises a polymer, excluding the copolymer comprising the fluoromonomer unit and the amide bond-containing monomer unit.

9 . The electrode according to claim 8 , wherein the electrode active material is a positive electrode active material.

10 . The electrode according to claim 9 , wherein the positive electrode active material is a positive electrode active material comprising at least one alkali metal selected from the group consisting of Li, Na, and K.

11 . The electrode according to claim 9 , wherein the positive electrode active material is a positive electrode active material comprising at least one alkali metal selected from the group consisting of Li, Na, and K, and at least one metal selected from the group consisting of Fe, Ni, Mn, Cu, Zn, Al, Sn, Cr, V, Ti, Mg, Ca, Sr, B, Ga, In, Si, and Ge.

12 . The electrode according to claim 9 , wherein the electrode active material layer further comprises a conductive material.

13 . The electrode according to claim 12 , wherein when a mass of the electrode active material layer is 100% by mass, a content of the positive electrode active material is 80.0 to 99.8% by mass, a content of the conductive material is 0.1 to 10.0% by mass, and a content of the binder is 0.1 to 10.0% by mass.

14 . The electrode according to claim 8 , wherein the electrode active material is a negative electrode active material.

15 . The electrode according to claim 14 , wherein the negative electrode active material is a negative electrode active material comprising a carbonaceous material, or a negative electrode active material comprising a compound comprising at least one element selected from the group consisting of Si, Sn, V, Nb, and Ti.

16 . The electrode according to claim 14 , wherein when a mass of the electrode active material layer is 100% by mass, a content of the negative electrode active material is 99.9 to 80.0% by mass, and a content of the binder is 0.1 to 20.0% by mass.

17 . The electrode according to claim 1 , wherein the electrode is used in an electrochemical device.

18 . A secondary battery comprising the electrode according to claim 1 .

Assignees

• Daikin Ind Ltd

Inventors

• Fukushima Kanta
• Ueda Yuki
• Yamazaki Shigeaki

Classifications

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/628 Primary

  Inhibitors, e.g. gassing inhibitors, corrosion inhibitors · CPC title

• H01M4/62 Primary

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title