1. A method of forming a substantially waterproof enclosure for an electronic communications device, comprising:
molding a first housing section defining a cavity and having a peripheral edge;
molding a second housing section defining a cavity and having a peripheral edge cooperatively configured for continuous contact with the peripheral edge of the first housing section;
molding a continuous elastomeric gasket along the peripheral edge of the first housing section;
disposing between the housing sections\u2014
a global positioning system receiver for receiving satellite signals from a plurality of satellites,
a processor coupled with the global positioning system receiver for calculating a first location of the global positioning system receiver as a function of the received satellite signals,
a radio transceiver coupled with the processor for directly transmitting and receiving direct voice and data communications, wherein the transmitted data communications is indicative of the first location, and wherein the processor is configured to identify a second location based upon the received data communications, and
a display coupled with the processor for indicating the second location;
placing the first housing section and the second housing section with their respective peripheral edges in mutual alignment; and
compressing the elastomeric gasket therebetween.
2. The method of claim 1, wherein molding the continuous elastomeric gasket comprises forming a seal bead protruding from a surface of the continuous elastomeric gasket and wherein compressing the gasket comprises compressing the seal bead.
3. The method of claim 2, further including configuring the peripheral edge of the second housing section as a flat and compressing the seal bead against the flat.
4. The method of claim 3, further including polishing the flat.
5. The method of claim 1, wherein molding of the first housing section, the second housing section and the elastomeric gasket comprises injection molding.
6. The method of claim 5, wherein injection molding of the elastomeric gasket is effected in a different mold than injection molding of the first housing section.
7. The method of claim 1, wherein\u2014the housing sections each include a top wall, a first side wall, and a second side wall,
first and second tubular structures protrude upwardly from at least one of the top walls, and
a ridge extends upwardly from the top, first, and second side walls to create a cavity when the first and second housing sections are cooperatively coupled.
8. The method of claim 7, wherein the waterproof enclosure further comprises a cover having a body portion and at least first and second tubular cover portions, wherein the first tubular cover portion covers the first tubular structure, the second tubular cover portion covers the second tubular structure and at least a portion of the body portion of the cover is received in the cavity.
9. The method of claim 8, wherein each of the at least first and second cover tubular portions includes an annular protrusion on an interior thereof sized to compressibly contact an exterior surface of a tubular structure covered thereby.
10. A method of forming a substantially waterproof enclosure for an electronic communications device, comprising:
injection molding a first housing section defining a cavity and having a peripheral edge;
injection molding a second housing section defining a cavity and having a flat peripheral edge cooperatively configured for continuous contact with the peripheral edge of the first housing section, and wherein;
injection molding a continuous elastomeric gasket along the peripheral edge of the first housing section including forming a seal bead protruding from a surface of the continuous elastomeric gasket;
disposing between the housing sections\u2014
a global positioning system receiver for receiving satellite signals from a plurality of satellites,
a processor coupled with the global positioning system receiver for calculating a first location of the global positioning system receiver as a function of the received satellite signals,
a radio transceiver coupled with the processor for directly transmitting and receiving direct voice and data communications, wherein the transmitted data communications is indicative of the first location, and wherein the processor is configured to identify a second location based upon the received data communications, and
a display coupled with the processor for indicating the second location;
placing the first housing section and the second housing section with their respective peripheral edges in mutual alignment; and
compressing the seal bead of the elastomeric gasket with the flat peripheral edge of the second housing section.
11. The method of claim 10, further including polishing the flat.
12. The method of claim 10, wherein injection molding of the elastomeric gasket is effected in a different mold than injection molding of the first housing section.
13. The method of claim 10, wherein\u2014
the housing sections each include a top wall, a first side wall, and a second side wall,
first and second tubular structures protrude upwardly from at least one of the top walls, and
a ridge extends upwardly from the top, first, and second side walls to create a cavity when the first and second housing sections are cooperatively coupled.
14. The method of claim 13, wherein the waterproof enclosure further comprises a cover having a body portion and at least first and second tubular cover portions, wherein the first tubular cover portion covers the first tubular structure, the second tubular cover portion covers the second tubular structure and at least a portion of the body portion of the cover is received in the cavity.
15. The method of claim 14, wherein each of the at least first and second cover tubular portions includes an annular protrusion on an interior thereof sized to compressibly contact an exterior surface of a tubular structure covered thereby.
16. The method of claim 10, wherein first and second tubular structures protrude upwardly from at least one of the housing sections.
17. The method of claim 16, wherein the waterproof enclosure further comprises a cover having a body portion and at least first and second tubular cover portions, wherein the first tubular cover portion covers the first tubular structure, the second tubular cover portion covers the second tubular structure.
18. The method of claim 17, wherein each of the at least first and second cover tubular portions includes an annular protrusion on an interior thereof sized to compressibly contact an exterior surface of a tubular structure covered thereby.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A surface treatment method of a solid electrolyte for a sodium secondary battery, comprising:
a first step of preparing a polymer solution obtained by polymerizing a first hydrocarbon-based binder having a hydroxyl group in a molecular structure and a second, hydrocarbon-based binder having an amine group in the molecular structure, wherein the polymerizing of the first hydrocarbon-based binder and the second hydrocarbon-based binder is performed by adding an acid catalyst to a mixed solution including the first hydrocarbon-based binder, the second, hydrocarbon-based binder, and a pore-forming agent;
a second step of forming a polymer film by coating the polymer solution onto one region of a surface of a sodium ion conductive solid electrolyte; and
a third step of forming a porous carbon coating layer by carbonizing the polymer film.
2. The surface treatment method of claim 1, wherein the sodium ion conductive solid electrolyte is beta alumina or NASICON.
3. The surface treatment method of claim 1, wherein the carbon coating layer contacts molten sodium of the sodium secondary battery.
4. The surface treatment method of claim 1, wherein the first hydrocarbon-based binder is represented by Chemical Formula 1 below:
in Chemical Formula 1,
R1 to R3 are each independently hydrogen or (C1\u02dcC4)alkyl.
5. The surface treatment method of claim 4, wherein the second hydrocarbon-based binder is represented by Chemical Formula 2 below:
in Chemical Formula 2,
R4 to R7 are each independently hydrogen or (C1\u02dcC4)alkyl.
6. The surface treatment method of claim 5, wherein the mixed solution of step 1 contains 20 to 35 parts by weight of the second hydrocarbon-based binder and 30 to 70 parts by weight of the pore-forming agent, in relation to 100 parts by weight of the first hydrocarbon-based binder.
7. The surface treatment method of claim 6, wherein the acid catalyst of step 1 has a content of 0.1 to 2.0 parts by weight, in relation to 100 parts by weight of the first hydrocarbon-based binder.
8. The surface treatment method of claim 1, wherein the polymerizing of step 1 is performed at a temperature between \u221220 to 110\xb0 C.
9. The surface treatment method of claim 1, wherein the coating of step 2 is performed by coating the polymer solution having a coating amount within a range of 0.01 to 0.5 gcm2.
10. The surface treatment method of claim 1, wherein the carbonizing of step 3 is performed under an inert atmosphere within a range of 300 to 600\xb0 C.
11. A solid electrolyte surface-treated with a carbon coating layer having a porosity of 0.01 to 0.3 cm3gcarbon.
12. The solid electrolyte of claim 11, wherein the carbon coating layer is an amorphous carbon, a crystalline carbon or mixtures thereof.
13. The solid electrolyte of claim 12, wherein the solid electrolyte has permeability with respect to sodium ions, and has impermeability with respect to anions.
14. The solid electrolyte of claim 13, wherein ionic conductivity with respect to the sodium ions of the solid electrolyte has a range of 20 to 400 mScm2 at 90 to 200\xb0 C.
15. A sodium secondary battery including the solid electrolyte of claim 11.
16. The sodium secondary battery of claim 15, wherein the sodium secondary battery includes an anode containing sodium; a molten sodium contacting the carbon coating layer of the solid electrolyte; and a cathode.
17. The sodium secondary battery of claim 16, wherein the cathode contains a transition metal andor a transition metal halide.
18. The sodium secondary battery of claim 17, wherein the cathode contains a halide in which a halide containing sodium and a halide containing aluminum, achieve a eutectic point; a sodium salt; or mixtures thereof, and the sodium salt contains a halide containing a hydroxide, a borate or a phosphate.