ELECTRODE ASSEMBLY FOR ELECTROCHEMICAL DEVICE AND ELECTROCHEMICAL DEVICE INCLUDING THE SAME

• US 20130011715A1
• Filed: 08/30/2012
• Published: 01/10/2013
• Est. Priority Date: 07/07/2011
• Status: Abandoned Application

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: LEE, Joo-Sung, Kim, In-Chul, Ryu, Bo-Kyung, Kim, Jong-Hun
• Application Number:
  US13/599,403
• Publication Number:
  US 20130011715A1
• Time in Patent Office: Days
• US Class Current: 429/144
• CPC Class Codes: H01G 11/12 Stacked hybrid or EDL capacitors
• CPC Class Codes: H01G 11/52 Separators
• CPC Class Codes: H01G 11/82 Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
• CPC Class Codes: H01G 11/84 Processes for the manufacture of hybrid or EDL capacitors, or components thereof
• CPC Class Codes: H01M 10/045 Cells or batteries with folded plate-like electrodes
• CPC Class Codes: H01M 10/0459 Cells or batteries with folded separator between plate-like electrodes
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 4/364 as mixtures
• CPC Class Codes: H01M 4/621 Binders
• CPC Class Codes: H01M 50/414 Synthetic resins, e.g. thermoplastics or thermosetting resins
• CPC Class Codes: H01M 50/417 Polyolefins
• CPC Class Codes: H01M 50/42 Acrylic resins
• CPC Class Codes: H01M 50/426 Fluorocarbon polymers
• CPC Class Codes: H01M 50/429 Natural polymers
• CPC Class Codes: H01M 50/431 Inorganic material
• CPC Class Codes: H01M 50/434 Ceramics
• CPC Class Codes: H01M 50/446 Composite material consisting of a mixture of organic and inorganic materials
• CPC Class Codes: H01M 50/451 comprising layers of only organic material and layers containing inorganic material
• CPC Class Codes: H01M 50/46 Separators, membranes or diaphragms characterised by their combination with electrodes
• CPC Class Codes: H01M 50/461 with adhesive layers between electrodes and separators
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02E 60/13 : Energy storage using capacitors
• CPC Class Codes: Y02P 70/50 : Manufacturing or production processes characterised by the final manufactured product

Abstract

Disclosed is an electrode assembly having a structure in which a plurality of unit cells are bonded to one or both surfaces of a first separator whose length is greater than width and are stacked in a zigzag pattern or wound sequentially. The first separator includes a first porous electrode adhesive layer, to which electrodes of the unit cells are adhered, formed at one surface thereof to which the unit cells are bonded. The first porous electrode adhesive layer includes a mixture of inorganic particles and a binder polymer. Each of the unit cells includes a second separator including second porous electrode adhesive layers, to which electrodes of the unit cell are adhered, formed at both surfaces thereof. Each of the second porous electrode adhesive layers includes a mixture of inorganic particles and a binder polymer. Further disclosed is an electrochemical device including the electrode assembly.

Claims

1. An electrode assembly having a structure in which a plurality of unit cells are bonded to one or both surfaces of a first separator whose length is greater than width and are stacked in a zigzag pattern or wound sequentially,

wherein the first separator comprises a first porous electrode adhesive layer, to which electrodes of the unit cells are adhered, formed at one surface thereof to which the unit cells are bonded and comprising a mixture of inorganic particles and a binder polymer, and

wherein each of the unit cells comprises a second separator which comprises second porous electrode adhesive layers, to which electrodes of the unit cell are adhered, formed at both surfaces thereof and comprising a mixture of inorganic particles and a binder polymer.

2. The electrode assembly according to claim 1, wherein each of the unit cells is a full cell comprising opposite electrodes with different structures.

3. The electrode assembly according to claim 1, wherein each of the unit cells is a bicell comprising opposite electrodes with the same structure.

4. The electrode assembly according to claim 1, wherein the first separator and the second separator each independently comprise a porous polyolefin substrate.

5. The electrode assembly according to claim 4, wherein the porous polyolefin substrate is made of a polymer selected from the group consisting of polyethylene, polypropylene, polybutylene and polypentene.

6. The electrode assembly according to claim 1, wherein the inorganic particles of the first porous electrode adhesive layer and the inorganic particles of the second porous electrode adhesive layers are each independently selected from the group consisting of inorganic particles having a dielectric constant of at least 5, inorganic particles having the ability to transport lithium ions, and mixtures thereof.

7. The electrode assembly according to claim 6, wherein the inorganic particles having a dielectric constant of at least 5 are selected from the group consisting of BaTiO₃, Pb (Zr_x,Ti_1-x)O₃ (PZT, 0<

x<

1), Pb_1-xLa_xZr_1-yTi_yO₃ (PLZT, 0<

x<

1, 0<

y<

1), (1−

x)Pb(Mg_1/3Nb_2/3)O_3-xPbTiO₃ (PMN-PT, 0<

x<

1), hafnia (HfO₂), SrTiO₃, SnO₂, CeO₂, MgO, NiO, CaO, ZnO, ZrO₂, SiO₂, Y₂O₃, Al₂O₃, SiC, TiO₂ particles, and mixtures thereof.

8. The electrode assembly according to claim 6, wherein the inorganic particles having the ability to transport lithium ions are selected from the group consisting of lithium phosphate (Li₃PO₄) particles, lithium titanium phosphate (Li_xTi_y(PO₄)₃, 0<

x<

2, 0<

y<

3) particles, lithium aluminum titanium phosphate (Li_xAl_yTi_z(PO₄)₃, 0<

x<

2, 0<

y<

1, 0<

z<

3) particles, (LiAlTiP)_xO_y type glass (0<

x<

4, 0<

y<

13) particles, lithium lanthanum titanate (Li_xLa_yTiO₃, 0<

x<

2, 0<

y<

3) particles, lithium germanium thiophosphate (Li_xGe_yP_zS_w, 0<

x<

4, 0<

y<

1, 0<

z<

1, 0<

w<

5) particles, lithium nitride (Li_xN_y, 0<

x<

4, 0<

y<

2) particles, SiS₂ type glass (Li_xSi_yS_z, 0<

x<

3, 0<

y<

2, 0<

z<

4) particles, P₂S₅ type glass (Li_xP_yS_z, 0<

x<

3, 0<

y<

3, 0<

z<

7) particles, and mixtures thereof.

9. The electrode assembly according to claim 1, wherein the binder polymer of the first porous electrode adhesive layer and the binder polymer of the second porous electrode adhesive layers are each independently selected from the group consisting of polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polymethyl methacrylate, polybutyl acrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyvinyl alcohol, polyethylene-co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylpullulan, cyanoethyl polyvinyl alcohol, cyanoethyl cellulose, cyanoethyl sucrose, pullulan, carboxymethyl cellulose, and low molecular weight compounds having a molecular weight of 10,000 g/mol or lower.

10. The electrode assembly according to claim 1, wherein the weight ratio of the inorganic particles to the binder polymer in the first porous electrode adhesive layer and the weight ratio of the inorganic particles to the binder polymer in the second porous electrode adhesive layers are each independently from 10:

90 to 99;

1.

11. An electrochemical device comprising the electrode assembly according to claim 1.

12. A secondary battery comprising the electrode assembly according to claim 1 and a case sealing and accommodating the electrode assembly together with an electrolyte solution.