Energy conversion film and energy conversion element using same

Patent metadata

Field	Value
Publication number	US-11515810-B2
Application number	US-201816481983-A
Country	US
Kind code	B2
Filing date	Jan 31, 2018
Priority date	Feb 1, 2017
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

Provided is an energy conversion film excellent in charge retention performance and suppressed in deterioration of piezoelectricity even if it is exposed to a high temperature environment and an energy conversion element and the like using the film. An energy conversion element comprising: an energy conversion film at least comprises a charged resin film consisting of a resin film at least containing a thermoplastic resin and a metal soap; and an electrode provided on at least one of the two surfaces of the energy conversion film.

First claim

The invention claimed is:

1. An energy conversion element comprising:
an energy conversion film at least comprising a charged resin film consisting of a resin film at least containing a thermoplastic resin and a metal soap; and
an electrode provided on at least one of two surfaces of the energy conversion film, wherein
the metal soap is a salt of a fatty acid having 5 to 30 carbon atoms and aluminum;
the resin film is a porous resin film having pores within the film;
the porous resin film is a multilayer resin film comprising a core layer and a skin layer;
the core layer comprises at least the thermoplastic resin, the metal soap, and a pore-forming nucleating agent; and
the porous resin film has a porosity of 20% to 80%.

2. The energy conversion element according to claim 1 , wherein the thermoplastic resin contains a polyolefin resin, and the metal soap has a melting point of 50° C. to 220° C.

3. The energy conversion element according to claim 1 , wherein the energy conversion film at least comprises a charged resin film obtained by injecting a charge into the resin film by a DC corona discharge processing.

4. The energy conversion element according to claim 1 , wherein the electrode has a surface resistivity of 1×10 −3 Ω/□ to 9×10 7 Ω/□.

5. The energy conversion element according to claim 1 , wherein a maximum voltage, which is generated by an impact when an iron ball having a diameter of 9.5 mm and a mass of 3.5 g is naturally dropped from a height of 8 mm in the vertical direction on the energy conversion element, which has been subjected to a heat treatment at 85° C. for 14 days and placed on a horizontal plane at a temperature of 23° C. in an environment of a relative humidity of 50%, is 5 mV or more.

6. An energy conversion film at least comprising a charged resin film consisting of a resin film at least containing a thermoplastic resin and a metal soap, wherein
the metal soap is a salt of a fatty acid having 5 to 30 carbon atoms and aluminum;
the resin film is a porous resin film having pores within the film;
the porous resin film is a multilayer resin film comprising a core layer and a skin layer;
the core layer comprises at least the thermoplastic resin, the metal soap, and a pore-forming nucleating agent; and
the porous resin film has a porosity of 20% to 80%.

7. The energy conversion element according to claim 2 , wherein the energy conversion film at least comprises a charged resin film obtained by injecting a charge into the resin film by a DC corona discharge processing.

8. The energy conversion element according to claim 2 , wherein the electrode has a surface resistivity of 1×10 −3 Ω/□ to 9×10 7 Ω/□.

9. The energy conversion element according to claim 3 , wherein the electrode has a surface resistivity of 1×10 −3 Ω/□ to 9×10 7 Ω/□.

10. The energy conversion element according to claim 7 , wherein the electrode has a surface resistivity of 1×10 −3 Ω/□ to 9×10 7 Ω/□.

11. The energy conversion element according to claim 2 , wherein a maximum voltage, which is generated by an impact when an iron ball having a diameter of 9.5 mm and a mass of 3.5 g is naturally dropped from a height of 8 mm in the vertical direction on the energy conversion element, which has been subjected to a heat treatment at 85° C. for 14 days and placed on a horizontal plane at a temperature of 23° C. in an environment of a relative humidity of 50%, is 5 mV or more.

12. The energy conversion element according to claim 3 , wherein a maximum voltage, which is generated by an impact when an iron ball having a diameter of 9.5 mm and a mass of 3.5 g is naturally dropped from a height of 8 mm in the vertical direction on the energy conversion element, which has been subjected to a heat treatment at 85° C. for 14 days and placed on a horizontal plane at a temperature of 23° C. in an environment of a relative humidity of 50%, is 5 mV or more.

13. The energy conversion element according to claim 7 , wherein a maximum voltage, which is generated by an impact when an iron ball having a diameter of 9.5 mm and a mass of 3.5 g is naturally dropped from a height of 8 mm in the vertical direction on the energy conversion element, which has been subjected to a heat treatment at 85° C. for 14 days and placed on a horizontal plane at a temperature of 23° C. in an environment of a relative humidity of 50%, is 5 mV or more.

14. The energy conversion element according to claim 4 , wherein a maximum voltage, which is generated by an impact when an iron ball having a diameter of 9.5 mm and a mass of 3.5 g is naturally dropped from a height of 8 mm in the vertical direction on the energy conversion element, which has been subjected to a heat treatment at 85° C. for 14 days and placed on a horizontal plane at a temperature of 23° C. in an environment of a relative humidity of 50%, is 5 mV or more.

15. The energy conversion element according to claim 8 , wherein a maximum voltage, which is generated by an impact when an iron ball having a diameter of 9.5 mm and a mass of 3.5 g is naturally dropped from a height of 8 mm in the vertical direction on the energy conversion element, which has been subjected to a heat treatment at 85° C. for 14 days and placed on a horizontal plane at a temperature of 23° C. in an environment of a relative humidity of 50%, is 5 mV or more.

16. The energy conversion element according to claim 9 , wherein a maximum voltage, which is generated by an impact when an iron ball having a diameter of 9.5 mm and a mass of 3.5 g is naturally dropped from a height of 8 mm in the vertical direction on the energy conversion element, which has been subjected to a heat treatment at 85° C. for 14 days and placed on a horizontal plane at a temperature of 23° C. in an environment of a relative humidity of 50%, is 5 mV or more.

17. The energy conversion element according to claim 10 , wherein a maximum voltage, which is generated by an impact when an iron ball having a diameter of 9.5 mm and a mass of 3.5 g is naturally dropped from a height of 8 mm in the vertical direction on the energy conversion element, which has been subjected to a heat treatment at 85° C. for 14 days and placed on a horizontal plane at a temperature of 23° C. in an environment of a relative humidity of 50%, is 5 mV or more.

Assignees

• Yupo Corp

Inventors

• Koike Hiroshi
• Sugamata Yutaro
• Iida Seiichiro

Classifications

• H01G7/028 Primary

  having a heterogeneous dielectric · CPC title

• H01G7/023

  of macromolecular compounds · CPC title

• H02N1/08 Primary

  with conductive charge carrier, i.e. capacitor machines · CPC title

• H01G7/02

  Electrets, i.e. having a permanently-polarised dielectric · CPC title

• H01G7/021

  having an organic dielectric · CPC title