US4731705A — Cell for electric double layer capacitors and pro…

Claim 1

Independent Claim 100 words

A cell for an electric double layer capacitor, comprising: a membrane formed of a solid protonic conducting electrolyte separating two electrodes; and two electrodes each comprising a composite electrode including a mixture of predetermined proportions of at least one electronic conductor and at least one solid electrolyte, said solid electrolyte of said composite electrode comprising a protonic conductor chosen from a group consisting of uranyl phosphate H 3 OUO 2 PO 4 .3H 2 O, zirconium phosphate Zr(HOP 4 ) 2 nH 2 O, derivatives of these compounds and protonic conductors with high protonic conductivity having a low electronic conductivity.

Claim 2

Dependent Claim 100 words

A cell for an electric double layer capacitor, comprising: a membrane formed of a solid protonic conducting electrolyte separating two electrodes; and two electrodes each comprising a composite electrode including a mixture of predetermined proportions of at least one electronic conductor and at least one solid electrolyte, said solid electrolyte of said composite electrode comprising a protonic conductor chosen from a group consisting of uranyl phosphate H 3 OUO 2 PO 4 .3H 2 O, zirconium phosphate Zr(HOP 4 ) 2 nH 2 O, derivatives of these compounds and protonic conductors with high protonic conductivity having a low electronic conductivity.

Claim 3

Dependent Claim 63 words

The cell as claimed in claim 1, wherein said solid protonic conducting electrolyle of said membrane comprises a protonic conductor chosen from a group consisting of uranyl phosphate H 3 OUO 2 PO 4 .3H 2 O, zirconium phosphate Zr (HPO 4 ) 2 nH 2 O, derivatives of these compounds and protonic conductors with high protonic conductivity having a low electronic conductivity.

Claim 4

Dependent Claim 22 words

The cell as claimed in claim 2, wherein the H 3 O + ions are substituted wholly or partially by a cation.

Claim 5

Dependent Claim 32 words

The cell as claimed in claim 3, wherein the cation is chosen from the group consiting of Na + , Li + , K + , Ca 2+ , Ag + .

Claim 6

Dependent Claim 29 words

The cell as claimed in claim 1, wherein the electronic conductor comprises one of activated carbon black, acetylene black or a mixture of different carbon blacks and/or acetylene black.

Claim 7

Dependent Claim 36 words

The cell as claimed in any one of claims 1 to 5, wherein said solid protonic conducting electrolyte forming the membrane is of a nature different from the solid electrolyte comprising the mixture in the electrodes.

Claim 8

Dependent Claim 22 words

The cell as claimed in any one of claims 1 to 6, wherein said membrane, comprises an organic protonated species exchanging membrane.

Claim 9

Dependent Claim 23 words

The cell as claimed in any one of claims 1 to 7, wherein said membrane comprises a porous structure imbibed with an electrolyte.

Claim 10

Dependent Claim 25 words

The cell as claimed in any one of claims 1 to 8, further including first and second metal terminators respectively mounted on the two electrodes.

Claim 11

Dependent Claim 17 words

The cell as claimed in any one of claims 1 to 9, encapsulated in an insulating material.

Claim 12

Independent Claim 71 words

A method of manufacturing a cell for an electric double layer capacitor, comprising the following steps: forming a composite electrode powder comprising an electronic conductor and a solid electrolyte; forming a membrane powder including a solid protonic conducting electrolyte; preforming a membrane by pressing said membrane powder; simulteanously sintering two electrodes having said composite electrode powder, and said membrane; positioning two metal terminators on said electrodes, respectively; and encapsulating said cell.

Claim 13

Independent Claim 71 words

A method of manufacturing a cell for an electric double layer capacitor, comprising the following steps: forming a composite electrode powder comprising an electronic conductor and a solid electrolyte; forming a membrane powder including a solid protonic conducting electrolyte; preforming a membrane by pressing said membrane powder; simulteanously sintering two electrodes having said composite electrode powder, and said membrane; positioning two metal terminators on said electrodes, respectively; and encapsulating said cell.

Claim 14

Dependent Claim 58 words

The method as claimed in claim 11, wherein said step forming the composite electrode powder includes the step of forming a mixture by dispersing the electronic conductor in an aqueous solution of solid electrolyte constituents, and agitating said mixture at a predetermined temperature for a predetermined time so as to obtain an electrolyte precipitate enclosing the electronic conductor.

Claim 15

Dependent Claim 43 words

The method as claimed in claim 12, wherein said step of forming said composite powder includes the step of forming said solid electrolyte and said electronic conductor in predetermined proportions to obtain a composite powder with a lowest resistivity and a highest capacity.

Claim 16

Dependent Claim 34 words

The method as claimed in claim 12, wherein said step of forming said composite powder includes the step of forming said composite powder using a powdered electronic conductor which has been previously heat treated.

Claim 17

Independent Claim 46 words

The method as claimed in any one of claims 11 to 14, wherein said step of forming said composite powder includes the step of forming a precipitate comprising said electronic conductor and said solid electrolyte, and the steps of washing, filtering, drying and crushing said precipitate.

Claim 18

Dependent Claim 78 words

The method as claimed in claim 11, further including the step of forming both said solid electrolyte and said solid protonic conducting electrolyte with H 3 OUO 2 PO 4 .3H 2 O, the H 3 OUO 2 PO 4 .3H 2 O powder by causing an equimolar mixture of 2 solutions of uranyl nitrate and phosphoric acid to precipitate at ambient temperature, in an aqueous medium, with permanent agitation for a period of 2 to 10 hours.

Claim 19

Dependent Claim 101 words

A cell for an electric double layer capacitor comprising: a membrane formed of a solid protonic conducting electrolyte separating two electrodes, said solid protonic conducting electrolyte of said membrane comprising a protonic conductor chosen from a group consisting of uranyl phosphate H 3 OUO 2 PO 4 .3H 2 O, zirconium phosphate Zr(HPO 4 ) 2 nH 2 O, derivatives of these compounds and protonic conductors with high protonic conductivity having a low electronic conductivity; and two electrodes each comprising a composite electrode including a mixture of predetermined proportions of at least one electronic conductor and at least one solid electrolyte.

Claim 20

Dependent Claim 101 words

A cell for an electric double layer capacitor comprising: a membrane formed of a solid protonic conducting electrolyte separating two electrodes, said solid protonic conducting electrolyte of said membrane comprising a protonic conductor chosen from a group consisting of uranyl phosphate H 3 OUO 2 PO 4 .3H 2 O, zirconium phosphate Zr(HPO 4 ) 2 nH 2 O, derivatives of these compounds and protonic conductors with high protonic conductivity having a low electronic conductivity; and two electrodes each comprising a composite electrode including a mixture of predetermined proportions of at least one electronic conductor and at least one solid electrolyte.

Claim 21

Dependent Claim 61 words

A cell as claimed in claim 17, wherein said solid electrolyte of said composite electrode comprises a protonic conductor chosen from a group consisting of uranyl phosphate H 3 OUO 2 PO 4 .3H 2 O, zirconium phosphate Zr(HOP 4 ) 2 nH 2 O, derivatives of these compounds and protonic conductors with high protonic conductivity having a low electronic conductivity.

Claim 22

Dependent Claim 22 words

The cell as claimed in claim 17, wherein the H 3 O + ions are substituted wholly or partially by a cation.

Claim 23

Dependent Claim 32 words

The cell as claimed in claim 19, wherein the cation is chosen from the group consisting of Na + , Li + , K + , Ca 2+ , Ag + .

Claim 24

Dependent Claim 29 words

The cell as claimed in claim 17 wherein the electronic conductor comprises one of activated carbon black, acetylene black, or a mixture of different carbon blacks and/or acetylene black.

Claim 25

Dependent Claim 31 words

The cell as claimed in claim 17 wherein said solid protonic conducting electrolyte forming the membrane is of a nature different from the solid electrolyte comprising the mixture in the electrodes.

Claim 26

Dependent Claim 17 words

The cell as claimed in claim 17 wherein said membrane comprises an organic protonated species exchanging membrane.

Claim 27

Dependent Claim 18 words

The cell as claimed in claim 17 wherein said membrane comprises a porous structure imbibed with an electrolyte.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1991-03-15	1991-09-14	1992-03-15	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1995-03-15	1995-09-14	1996-03-15	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1999-03-15	1999-09-14	2000-03-15	$7700.00	Window Closed / Lapsed

Cell for electric double layer capacitors and process for manufacturing such a cell

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