Paste for forming conductive protection layer on collector laminate in non-aqueous rechargeable electricity-storage device

Patent metadata

Field	Value
Publication number	US-9373848-B2
Application number	US-201113816356-A
Country	US
Kind code	B2
Filing date	Sep 16, 2011
Priority date	Sep 17, 2010
Publication date	Jun 21, 2016
Grant date	Jun 21, 2016

Abstract

The present invention provides a conductive protective layer-forming paste for current collector laminates which can be used even for high voltage designs to protect current collectors from corroding without loss of cell characteristics, and a current collector laminate, an electrode laminate, and nonaqueous secondary cells (e.g. a lithium secondary cell, an electric double layer capacitor) that include a conductive protective layer formed therefrom. The paste for forming conductive protective layers for current collector protection includes: polytetrafluoroethylene; and a conductive filler (b). The current collector laminate includes: a conductive protective layer (A); and a current collector (B), the conductive protective layer (A) being formed by coating the paste for forming conductive protective layers onto the current collector (B).

First claim

The invention claimed is:

1. A paste for forming conductive protective layers for current collector protection, comprising:
polytetrafluoroethylene;
a conductive filler (b);
a solvent; and
at least one polymer selected from the group consisting of tetrafluoroethylene-hexafluoropropylene copolymers, polyamide-imide, polyimide, polyvinylidene fluoride, and tetrafluoroethylene-vinylidene fluoride copolymers.

2. The paste for forming conductive protective layers according to claim 1 ,
wherein the conductive filler (b) is a particulate filler, a fibrous filler, or a combination of a particulate filler and a fibrous filler.

3. The paste for forming conductive protective layers according to claim 1 ,
wherein the conductive filler (b) is a conductive carbon filler.

4. The paste for forming conductive protective layers according to claim 1 ,
wherein the conductive filler (b) is present in an amount of 5 to 1000 parts by mass relative to 100 parts by mass of the polytetrafluoroethylene.

5. A paste for forming conductive protective layers for current collector protection, comprising:
an aqueous dispersion (a) of polytetrafluoroethylene;
a conductive filler (b); and
at least one polymer selected from the group consisting of tetrafluoroethylene-hexafluoropropylene copolymers, polyamide-imide, polyimide, polyvinylidene fluoride, and tetrafluoroethylene-vinylidene fluoride copolymers.

6. The paste for forming conductive protective layers according to claim 5 ,
wherein the conductive filler (b) is a particulate filler, a fibrous filler, or a combination of a particulate filler and a fibrous filler.

7. The paste for forming conductive protective layers according to claim 5 ,
wherein the conductive filler (b) is a conductive carbon filler.

8. The paste for forming conductive protective layers according to claim 5 ,
wherein the conductive filler (b) is present in an amount of 5 to 1000 parts by mass relative to 100 parts by mass of polytetrafluoroethylene solids in the polytetrafluoroethylene dispersion (a).

9. A current collector laminate comprising:
a conductive protective layer (A); and
a current collector (B),
the conductive protective layer (A) being formed by coating the paste for forming conductive protective layers according onto claim 1 on the current collector (B).

10. The current collector laminate according to claim 9 ,
wherein the conductive protective layer (A) has a volume resistivity of 0.001 to 50 Ω·cm.

11. An electrode laminate comprising:
the current collector laminate according to claim 9 ; and
an electrode mixture layer (C) on the conductive layer (A) of the current collector laminate.

12. A lithium secondary cell comprising:
a positive electrode;
a negative electrode; and
a nonaqueous electrolytic solution,
at least one of the positive electrode and the negative electrode being the electrode laminate according to claim 11 .

13. An electric double layer capacitor comprising:
a positive electrode;
a negative electrode; and
a nonaqueous electrolytic solution,
at least one of the positive electrode and the negative electrode being the electrode laminate according to claim 11 .

Assignees

• Koh Meiten
• Sakata Hideo
• Sanagi Tomoyo
• Nakazawa Hitomi
• Arima Hiroyuki
• Ichisaka Toshiki
• Takahashi Kenzou
• Daikin Ind Ltd

Inventors

• Koh Meiten
• Sakata Hideo
• Sanagi Tomoyo
• Nakazawa Hitomi
• Arima Hiroyuki
• Ichisaka Toshiki
• Takahashi Kenzou

Classifications

• H01B1/24

  the conductive material comprising carbon-silicon compounds, carbon or silicon · CPC title

• Y02E60/13

  Energy storage using capacitors · CPC title

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01G11/30

  characterised by their material · CPC title

• H01M4/666

  in the form of mixed materials (H01M4/668 takes precedence) · CPC title