Electric energy storage device
The present invention relates to an electric energy storage device, in particular a battery, at least comprising: —an anode comprising a divalent metal selected from magnesium, calcium, beryllium and zinc or a combination thereof or an alloy comprising at least one of these metals; —a cathode comprising elemental sulphur, or a sulphur-containing organosilane compound, or a mixture of sulphur-containing organosilane compounds, or a mixture of sulphur and sulphur-containing organosilane compounds grafted on the surface of the cathode; and—an electrolyte placed between the anode and the cathode; wherein the cathode comprises a current collector surface that has been at least partly modified by grafting the sulphur-containing organosilane compound or a mixture of sulphur-containing organosilane compounds thereon.
1. A battery selected from a magnesium-sulphur, a calcium-sulphur, beryllium-sulphur or zinc-sulphur battery, at least comprising:
an anode comprising a divalent metal selected from magnesium, calcium, beryllium and zinc or a combination thereof or an alloy comprising at least one of these metals;
a cathode comprising a current collector surface; and
an electrolyte placed between the anode and the cathode;
wherein the current collector surface that has been at least partly modified by grafting the sulphur-containing organosilane compound or a mixture of sulphur-containing organosilane compounds thereon-wherein the sulphur-containing organosilane compound has the general molecular formula (I):
wherein R 1 , R 2 and R 3 are independently selected from C 1-12 alkoxy, acyloxy, aryloxy, alkyl, aryl, hydroxyl (OH) and halogen groups;
wherein R 4 is independently selected from a divalent hydrocarbon, preferably a C 1-18 alkylene or arylene;
wherein n is independently selected from an integer from 1 to 10;
wherein R 5 is selected from a divalent C 2-8 hydrocarbon, preferably alkylene or arylene; and
wherein p is independently selected from an integer including zero (0);
or an organosilane compound prepared by copolymerization of elemental sulphur and vinyl groups with silane functionalities such as vinyltriethoxysilane.
2. The battery according to claim 1 , wherein anode comprises a magnesium-aluminum-zinc alloy.
3. The battery according to claim 1 , wherein the current collector comprises aluminium.
4. The device battery according to claim 1 , wherein the cathode comprises one or more conductivity improvers, preferably selected from the group consisting of metal particles, carbon particles or a combination thereof.
5. The battery according to claim 1 , wherein R 1 , R 2 and R 3 are independently selected from ethoxy and hydroxyl groups.
6. The device battery according to claim 1 , wherein the sulphur-containing organosilane compound is a bis(3-triethoxysilylpropyl) polysulphide or an organosilane compound prepared by copolymerization of elemental sulphur and vinyl groups with silane functionalities.