ECO-ELECTRODE, DEVICE STORING ELECTRICAL ENERGY AND PROCESS FOR PREPARATION THEREOF

1 . A composite electrode for a device storing electrical energy wherein said electrode comprises an electrode body and an electrode shell, wherein said body comprises at least one water-soluble polymer and wherein at least a part of said shell comprises a shell comprising at least one organic or organometallic material.

2 . The composite electrode according to claim 1 , wherein said water-soluble polymer is selected from the group consisting of polysaccharides, Poly(ethylene glycol) (PEG), Polyoxyethylene (POE), Polyvinyl pyrrolidone (PVP), Polyvinyl alcohol (PVA), polylactic acid (PLA), Polyacrylic acid (PAA), Polyacrylamides, N-(2-Hydroxypropyl) methacrylamide (HPMA), Cellulose derivatives, in particular alkylcellulose, dialkylcellulose, hydroxyalkylcellulose, hydroxyalkylalkylcellulose, carboxyalkylcellulose, Pectins, Chitosan, Chitosan Derivatives, Dextran, Carrageenan, Guar gum, Guar gum derivatives, in particular chydroxypropyl guar, arboxyalkyl guar, Hyaluronic acid (HA), Starch or Starch Based Derivatives, polyethyloxazoline, and derivatives thereof.

3 . The composite electrode according to claim 1 , wherein said water-soluble polymer is selected from the group consisting of Hydroxypropylmethyl cellulose (HPMC), Hydroxypropyl cellulose (HPC), Hydroxyethyl cellulose (HEC), Carboxy methyl cellulose (CMC), in particular Sodium carboxy methyl cellulose (Na-CMC).

4 . The composite electrode according to claim 1 , wherein said organic or organometallic material is deposited by plasma treatment, for example said organometallic material is an organosilane or an organoalane or a mixture of an organic material with an organometallic material; for examples a precursor of an organometallic material is a siloxane, for example divinyltetramethyl disiloxane (DVTMDSO), octamethyl cyclotetrasiloxane (OMCATS hexamethyldisilazane (HMDSN), tetramethyldisiloxane, tetramethylcyclotetrasiloxane, Trimethylsilane, methyl- and methoxy-group organosilicon like tetramethoxysilane (TMOS), methyltrimethoxysilane (MTMOS), dimethyldimethoxysilane (DMDMOS), trimethylmethoxysilane (TMMOS), or Hexamethyldisilane.

5 . The composite electrode according to claim 1 , wherein said organometallic material is deposited by plasma deposition, in particular Plasma-Enhanced Chemical Vapor Deposition (PECVD).

6 . A process for preparing a composite electrode comprising a body comprising at least one water-soluble polymer, wherein said process comprises depositing by plasma deposition, in particular Plasma-Enhanced Chemical Vapor Deposition (PECVD) a material at least on a part of said body of said composite electrode.

7 . The process according to claim 6 , wherein said process comprises depositing by said plasma deposition at least one organic or organometallic material, thereby preparing a composite electrode.

8 . The process according to claim 6 , wherein said plasma deposition is performed under atmospheric pressure.

9 . The process according to claim 6 , wherein said plasma deposition is performed in the presence of a vapor phase comprising a precursor of organosilane or an organoalane bonds, for example said precursor is polyalkyldisiloxane, for example a disiloxane, for example Hexamethyldisiloxane (HMDSO), 2,4,6,8-Tetramethylcyclotetrasiloxane (TMCTS) or tetraethoxysilane (TEOS).

10 . The process according to claim 6 , wherein said plasma deposition is performed according to a roll-to-roll process.

11 . A device storing electrical energy wherein said device comprises one or more composite electrodes according to claim 1 .

12 . The device according to claim 11 , wherein said device comprises an aqueous solution in contact with said composite electrodes.

13 . The device according to claim 11 , wherein said device comprises at least one aqueous electrolyte.

14 . The device according to claim 11 , wherein said device comprises at least one organic electrolyte.

15 . The device according to claim 11 , wherein said device is a battery, for example a Li or Li-ion battery, a sodium or multivalent ion battery, such as for example Mg or Ca, a hybrid battery, for example a hybrid battery using Zn, Li or Na ions, or alkaline battery.