A porous two-wafer battery comprises a first wafer and a second wafer. Each of the first wafer and the second wafer comprises a substrate, a conductive layer, and a passivation layer. The first wafer is parallel to the second wafer. The passivation layer of the first wafer is closer to the passivation layer of the second wafer. The first wafer serves as an anode and the second wafer serves as a cathode. The substrate comprises a plurality of pores and a P+ doped region. The plurality of pores are symmetric with respect to a respective center of each of the first wafer and the second wafer. An adhesion promotion layer is between the conductive layer and a respective side wall of the plurality of pores.

A method of fabricating a porous wafer battery comprises the steps of providing a silicon wafer; forming a P+ doped region; patterning a mask; applying an etching process; removing the mask; applying a first metallization process; applying a second metallization process; applying a passivation process; and applying a back-end metallization process. A P+ doped region is introduced in the wafer. The P+ doped region can serve as an etch stop. The P+ doped region may also act as a good Ohmic contact for the back-end metallization.

A battery package comprises a plurality of porous wafer batteries and a housing enclosing the plurality of porous wafer batteries. Each of the plurality of porous wafer batteries may be a one-wafer battery or a two-wafer battery. Each pore of a plurality of pores of the one-wafer battery comprises a respective anode and a respective cathode. A first wafer of the two-wafer battery is an anode and a second wafer of the two-wafer battery is a cathode. The battery package further comprises a plurality of heating wafers and a plurality of cooling wafers. A cavity of the housing may be filled with a liquid.

A method for fabricating the electrochemical device includes provision of a first stack. This first stack successively includes: a first electrode, an electrically insulating liquid electrolyte in contact with the first electrode, a second electrode separated from the first electrode by the liquid electrolyte. The method includes an at least partial polymerisation step of the liquid electrolyte.

Described herein are systems and methods for the generation of electric current and/or electric potential utilizing micro- or nano-channels and capillary flow, including fluidic or microfluidic batteries and electrochemical cells. The provided systems and methods use capillary force to promote fluid flow through micro- and nano-fluidic channels by evaporating fluid at one terminus of the channel, and the resulting fluid flow generates electric potential and or current. Advantageously, the described systems and methods remove the need for pressurized vessels or external pumps, increasing net energy generation and decreasing complexity and size of potential fluidic batteries.

Vertical via connections to a battery are hermetically sealed to prevent environmental factors (e.g. moisture, oxygen, and nitrogen) from entering the internals of the battery through porous conductive material filling the vias resulting in reduced battery performance and battery failure.

Method of thinning and encapsulating a microelectronic component, including the following steps: supply of an elementary structure comprising a substrate with a thickness of more than 200 m, a microelectronic component and an adhesive layer; the adhesive layer being covered by a detachable protection layer, fix the detachable protection layer onto a manipulation structure 100, protection of the lateral face of the substrate, thinning of the substrate up to a thickness of less than 100 m, separation of the elementary structure from the manipulation structure, for example by separating the detachable protection layer from the adhesive layer.

The method may comprise a later step during which an element comprising one or several other elementary structures is fixed onto the adhesive layer of the elementary structure, so as to form a vertical stack.

A portable energy collection and storage device includes an electrically and thermally insulating substrate. At least one energy collection device is integrated into the electrically and thermally insulating substrate. At least one energy storage device is integrated into the electrically and thermally insulating substrate and is electrically coupled to the at least one energy collection device. A set of electrical contacts is integrated into the electrically and thermally insulating substrate and electrically coupled to the at least one energy storage device. The electrically and thermally insulating substrate has a thickness less than or equal to 1 mm.

The disclosure concerns an electrolyte, an electrolyte ink, a battery or other electrochemical cell including the same, and methods of making the electrolyte and electrochemical cell. The electrolyte includes an ionic liquid comprising a hydrophilic or hydrophobic anion, a multi-valent metal cation suitable for use in a battery cell, a polymer binder, and optional additives (e.g., a solid filler). The electrolyte ink includes components of the electrolyte and a solvent. The solvent and the polymer binder (or, when present, the solid filler) have a hydrophilicity, hydrophobicity or polarity similar to or matching that of the ionic liquid's anion, or form hydrogen bonds with the ionic liquid's anion. The electrolyte includes a solid inorganic filler that provides mechanical support form hydrogen bonds with the anion and/or a counterpart anion of the multi-valent metal cation, and links with a material in an adjacent layer of the electrochemical cell.

An electrode, in particular for micro-batteries, produced in a plurality of layers with intermediate steps of masking a first layer leaving some parts of the latter exposed in order next to produce a removal of material eliminating defects. After removal of the masking layer, the second layer can be formed. Other layers can then follow in the same way.