SOUTH 8 TECHNOLOGIES, INC.

Apparatus and methods maintain constant composition of multi-component liquefied-gas mixtures (e.g., for battery electrolytes or refrigerants) during dispensing by transferring vapor from a second container to a first to compensate for selective evaporation. Embodiments use heating, constant-pressure cylinders, pumps, or cycled intermediate cylinders, with sensors for control. Systems enable full utilization with minimal waste, scalable for industrial applications.

A method and system for purifying methyl fluoride (MeF) by removing dimethyl ether (Me 2 O) using a lithium salt sorbent, such as LiFSI or LiTFSI, are disclosed. Contaminated MeF is contacted with the sorbent, which preferentially adsorbs Me 2 O due to strong Lewis acid-base interactions, yielding purified MeF. The process may involve flowing through a sorbent bed, cryogenic collection, temperature differentials, or pumping, with optional multiple cycles for enhanced purity. This approach provides superior efficiency and purity compared to conventional methods, with experimental reductions up to 80% in Me 2 O content. Alternative salts and porous supports are also provided.

Disclosed herein is a design for an electrochemical energy-storage cell that can withstand high-pressure environments. The cell has a gas-tight cell housing that encloses an electrolyte in contact with an electrode assembly. The cell housing defines a cell volume. A pressure-equalizing member is connected to the cell housing and constructed to displace a portion of the cell volume to equalize a pressure differential between an external pressure on the cell and an interior pressure of the cell. The electrolyte remains in a liquid or gas phase when the pressure-equalizing member displaces the portion of the cell volume and equalizes the pressure differential.

The use of reservoir replenishing additives to an electrochemical cell in conjunction with a liquefied gas electrolyte is described to maintain high capacity and high energy of a battery cell.

Apparatus and methods maintain constant composition of multi-component liquefied gas mixtures (e.g., for battery electrolytes or refrigerants) during dispensing by transferring vapor from a second container to a first to compensate for selective evaporation. Embodiments use heating, constant pressure cylinders, pumps, or cycled intermediate cylinders, with sensors for control. Systems enable full utilization with minimal waste, scalable for industrial applications.

A method and system for purifying methyl fluoride (MeF) by removing dimethyl ether (Me 2 O) using a lithium salt sorbent, such as LiFSI or LiTFSI, are disclosed. Contaminated MeF is contacted with the sorbent, which preferentially adsorbs Me 2 O due to strong Lewis acid-base interactions, yielding purified MeF. The process may involve flowing through a sorbent bed, cryogenic collection, temperature differentials, or pumping, with optional multiple cycles for enhanced purity. This approach provides superior efficiency and purity compared to conventional methods, with experimental reductions up to 80% in Me 2 O content. Alternative salts and porous supports are also provided.

Electrochemical cells employing liquefied gas electrolytes may experience degradation of certain polymer components, such as tapes made from poly(ethylene terephthalate), poly(butylene terephthalate), or polydimethylsiloxane. These materials exhibit low chemical stability, potentially leading to cell failure. Embodiments disclosed herein utilize stable polymers, including polyimide, polypropylene, or polyethylene as tape carriers and poly(methyl methacrylate) as adhesives, to enhance compatibility and performance in such cells.

Electrochemical cells employing liquefied gas electrolytes may experience degradation of certain polymer components, such as tapes made from poly(ethylene terephthalate), poly(butylene terephthalate), or polydimethylsiloxane. These materials exhibit low chemical stability, potentially leading to cell failure. Embodiments disclosed herein utilize stable polymers, including polyimide, polypropylene, or polyethylene as tape carriers and poly(methyl methacrylate) as adhesives, to enhance compatibility and performance in such cells.

Disclosed herein is a design for an electrochemical energy-storage device. The device includes an electrode assembly with a separator that separates a positive electrode and a negative electrode. These electrodes and separator are radially coiled about a central axis to form a central void. A positive electrode current collector is in electrical contact with the positive electrode, while a negative electrode current collector is in electrical contact with the negative electrode. A conductive power rod is positioned in the central void and provides structural support to prevent the collapse of the central void. The rod is either: (a) in electrical contact with the positive electrode current collector and provides a low-resistance current path with a positive terminal; or (b) in electrical contact with the negative electrode current collector and provides a low-resistance current path with a negative terminal. Both terminals are electrically isolated from each other.

The use of reservoir replenishing additives to an electrochemical cell in conjunction with a liquefied gas electrolyte is described to maintain high capacity and high energy of a battery cell.