Abstract: Formation process for a potassium-ion hybrid supercapacitor, the process comprising: a) supplying the potassium-ion hybrid supercapacitor comprising: a negative electrode comprising graphite, a positive electrode comprising activated carbon, an electrolyte comprising a potassium salt, b) charging the supercapacitor at constant current in a protocol of between Cx/50 and Cx/2, to a charge cutoff voltage of between 3.0 V and 3.3 V, c) holding the supercapacitor at the charge cutoff voltage until the leakage current is between Cx/2000 and Cx/500, d) discharging the supercapacitor at constant current in a protocol of between Cx/50 and Cx, to a discharge cutoff voltage of between 0 V and 2 V, where the process further comprises degassing the supercapacitor after one of steps b) to d).

Abstract: A negative electrode for a lithium electrochemical generator, wherein it comprises, as active material, a lithium and calcium alloy, wherein the calcium is present in the alloy to the extent of 2% to 34% of atomic.

Abstract: A lithium-sulfur accumulator comprising at least one electrochemical cell comprising a positive electrode comprising, as active material, at least one sulfur-containing material, a negative electrode and an electrolyte conducting lithium ions disposed between the negative electrode and the positive electrode, wherein the negative electrode comprises, as active material, a lithium and calcium alloy, wherein the calcium is present in the alloy to the extent of 2% to 34% atomic.

Abstract: A lithium-air or lithium-oxygen electrochemical generator comprising at least one electrochemical cell comprising a positive electrode, a negative electrode and an electrolyte conducting lithium ions disposed between the negative electrode and the positive electrode wherein the negative electrode comprises, as active material, a lithium and calcium alloy.

Abstract: A negative electrode for a lithium electrochemical generator, wherein it comprises, as active material, a lithium and calcium alloy, wherein the calcium is present in the alloy to the extent of 2% to 34% of atomic.

Abstract: A lithium-sulfur accumulator comprising at least one electrochemical cell comprising a positive electrode comprising, as active material, at least one sulfur-containing material, a negative electrode and an electrolyte conducting lithium ions disposed between the negative electrode and the positive electrode, wherein the negative electrode comprises, as active material, a lithium and calcium alloy, wherein the calcium is present in the alloy to the extent of 2% to 34% atomic.

Abstract: A lithium-air or lithium-oxygen electrochemical generator comprising at least one electrochemical cell comprising a positive electrode, a negative electrode and an electrolyte conducting lithium ions disposed between the negative electrode and the positive electrod wherein the negative electrode comprises, as active material, a lithium and calcium alloy.

Abstract: A method of attachment between a metal collector and a carbon felt of a battery includes the steps of impregnation of the pores of the carbon felt with a mixture of metal powder and of a binder, locally performed in at least one predetermined area of the carbon felt; and spot welding between the metal collector and the carbon felt impregnated with the metal powder, performed at the level of said at least one predetermined area.

Abstract: A liquid cathode cell comprising: a calcium anode; an electrolyte comprising a sulfur and/or phosphorus oxidizing solvent and at least one salt; a cathode comprising a compound identical to the aforementioned oxidizing solvent as active material; characterized in that the cathode comprises a first zone consisting of a carbon matrix comprising entwined carbon fibers having a porosity of at least 90% and a specific surface area less than or equal to 5 m2/g, and comprising a second zone that is distinct from the first zone, wherein the second zone consists of a composite material comprising a binder and carbon black.

Abstract: A method of attachment between a metal collector and a carbon felt of a battery includes the steps of impregnation of the pores of the carbon felt with a mixture of metal powder and of a binder, locally performed in at least one predetermined area of the carbon felt; and spot welding between the metal collector and the carbon felt impregnated with the metal powder, performed at the level of said at least one predetermined area.

Abstract: The invention relates to a liquid cathode battery which comprises: an anode made of calcium; an electrolyte comprising a sulphur-containing and/or phosphorous-containing oxidising solvent and at least one salt; a cathode comprising, as the active material, a compound which is identical to the above-mentioned oxidising solvent, and which comprises a carbon-containing matrix; characterised in that the carbon-containing matrix is a self-supporting matrix which comprises interlaced carbon fibres and which has a porosity of at least 92% and a specific surface area less than 5 m2/g.

Abstract: The invention relates to a liquid cathode cell including: a calcium anode; an electrolyte containing a sulphurous or phosphorous oxidising solvent and at least one salt; and a cathode containing, as an active material, a compound that is identical to the aforementioned oxidising solvent. The invention is characterised in that the salt is a strontium salt which is present in a concentration of from 1.15 mol·L?1 to 3 mol·L?1.