Extruded sealing layer for biodegradable electrochemical device and methods thereof
An electrochemical device including a first substrate layer is disclosed. The electrochemical device also includes an anode disposed upon the first substrate layer. The device also includes a second substrate layer. The electrochemical device also includes a cathode disposed upon the second substrate layer and an electrolyte composition disposed between and in contact with the anode and the cathode. The electrochemical device also includes an extruded sealing layer composition disposed between the first substrate layer and the second substrate layer. A sealing layer composition and a method of producing a sealing layer is also disclosed.
1 . An electrochemical device, comprising:
a first substrate;
a first electrode disposed upon the first substrate;
a second substrate disposed over the first electrode; and
an extruded sealing layer composition comprising a biodegradable polymer present in the extruded sealing layer composition in an amount of from 20% to 90% by volume of the extruded sealing layer composition; and wherein:
the extruded sealing layer composition is disposed between and seals the first substrate and the second substrate.
2 . The electrochemical device of claim 1 , wherein the extruded sealing layer composition comprises a crosslinked polymer.
3 . The electrochemical device of claim 1 , wherein the extruded sealing layer composition comprises poly(ε-caprolactone) (PCL).
4 . The electrochemical device of claim 1 , wherein the extruded sealing layer composition comprises polylactic acid (PLA).
5 . The electrochemical device of claim 1 , wherein the extruded sealing layer composition comprises a biodegradable polymer, and a filler.
6 . The electrochemical device of claim 5 , wherein the biodegradable polymer comprises a particle having a particle size of from about 0.05 microns to about 250 microns.
7 . The electrochemical device of claim 5 , wherein the filler is present in the extruded sealing layer composition in an amount of from about 1.0% to about 30.0% based on a total weight of the extruded sealing layer composition.
8 . The electrochemical device of claim 5 , wherein the filler comprises cellulose, clay, mica, or a combination thereof.
9 . The electrochemical device of claim 1 , wherein the extruded sealing layer composition is disposed between the first substrate and the second substrate in a laterally non-continuous pattern.
10 . The electrochemical device of claim 1 , wherein the extruded sealing layer comprises a first portion and a second portion, the second portion comprising a thickness greater than that of the first portion.
11 . A sealing layer composition, comprising: a biodegradable polymer comprising a biodegradable polymer present in the sealing layer composition in an amount of from 20% to 90% by volume of the sealing layer composition; and
a filler comprising cellulose, clay, mica, or a combination thereof, wherein:
the sealing layer composition is extruded.
12 . The composition of claim 11 , wherein the sealing layer composition is incorporated into an electrochemical device.
13 . The composition of claim 12 , wherein the electrochemical device comprises a battery.
14 . The composition of claim 11 , wherein the filler is present in the extruded sealing layer composition in an amount of from about 1.0% to about 30.0% based on a total weight of the extruded sealing layer composition.
15 . A method of producing a sealing layer for an electrochemical device, comprising:
preparing a substrate;
dispensing a sealing layer composition from an extrusion dispenser onto the substrate;
and drying the sealing layer composition;
wherein the sealing layer forms a moisture barrier for the electrochemical device, and wherein the sealing layer composition comprises a biodegradable polymer present in the sealing layer composition in an amount of from 20% to 90% by volume of the sealing layer composition.
16 . The method of producing a sealing layer of claim 15 , further comprising subjecting the sealing layer to a higher temperature.
17 . The method of producing a sealing layer of claim 15 , further comprising dispensing two or more layers of sealing layer composition.
18 . The method of producing a sealing layer of claim 15 , wherein the sealing layer composition comprises a filler comprising cellulose, clay, mica, or a combination thereof.
19 . The method of producing a sealing layer of claim 15 , wherein the sealing layer composition has a viscosity from about 1,000 cP to about 1,000,000 cP.