A battery device is disclosed that includes an ionically conducting electrolyte comprising a mixture of a compressed gas solvent and one or more solid or liquid salts, wherein the compressed gas solvent comprises at least a first component that has a vapor pressure above 100 kPa at a room temperature of 293.15 K. The device also includes a housing enclosing the ionically conducting electrolyte under a pressurized condition to maintain the compressed gas solvent at a pressure higher than 100 kPa at a room temperature of 293.15 K. The device also includes at least two conducting electrodes in contact with the ionically conducting electrolyte.

Novel electrolytes, and techniques for making and devices using such electrolytes, which are based on compressed gas solvents are disclosed. Unlike conventional electrolytes, the disclosed electrolytes are based on “compressed gas solvents” mixed with various salts, referred to as “compressed gas electrolytes.” Various combinations of salt and solvents are disclosed to increase performance of electrochemical capacitors using liquefied gas electrolytes.

Disclosed is a non-aqueous electrolyte secondary battery including: a positive electrode; a negative electrode; and an electrolyte solution. The negative electrode contains a negative electrode active material that is capable of electrochemically absorbing and desorbing lithium. The negative electrode active material contains a lithium silicate phase and silicon particles that are dispersed in the lithium silicate phase. The lithium silicate phase is an oxide phase that contains lithium, silicon, and oxygen. The atomic ratio O/Si of oxygen relative to silicon in the lithium silicate phase is greater than 2 and less than 4. The electrolyte solution contains a halogenated benzene. The amount of halogenated benzene contained in the electrolyte solution is 1 ppm or more and 500 ppm or less.

Novel electrolytes, and techniques for making and devices using such electrolytes, which are based on compressed gas solvents are disclosed. Unlike conventional electrolytes, the disclosed electrolytes are based on “compressed gas solvents” mixed with various salts, referred to as “compressed gas electrolytes.” Various combinations of salt and solvents are disclosed to increase performance of electrochemical capacitors using liquefied gas electrolytes.

Chemical additives are disclosed to increase solubility of salts, increase voltage limit, and lower flammability of liquefied gas electrolytes.

According to an example aspect of the present invention, there is provided a rechargeable electromagnetic induction battery comprising: a first electrode, which comprises heat sink and an anode; a second electrode, which comprises heat sink and a cathode; an inductor coil; and an electrolytic solution contained between the first and second electrodes. Also, there is provided a method of charging an electromagnetic induction battery, comprising the steps of: attaching a voltage source to the battery, applying a direct current voltage to the battery for a first period of time, and applying an alternating current voltage to the battery for a second period of time, wherein the battery has an anode, cathode, inductor and an electrolytic solution comprising electrons, wherein the alternating current generates a magnetic field which excites the electrons in the electrolytic solution to an upper energy state.

A novel wound electrode assembly for a lithium oxyhalide electrochemical cell is described. The electrode assembly comprises an elongate cathode of an electrochemically non-active but electrically conductive carbonaceous material disposed between an inner elongate portion and an outer elongate portion of a unitary lithium anode. That way, lithium faces the entire length of the opposed major sides of the cathode. This inner anode portion/cathode/outer anode portion configuration is rolled into a wound-shaped electrode assembly that is housed inside a cylindrically-shaped casing. A cylindrically-shaped sheet-type spring centered in the electrode assembly presses outwardly to limit axial movement of the electrode assembly. In one embodiment, all the non-active components, except for the cathode current collector which is nickel, are made of stainless-steel. This provides the cell with a low magnetic signature without adversely affecting the cell's high-rate capability.

Provided is a binder composition for a non-aqueous secondary battery electrode that can form a slurry composition for a non-aqueous secondary battery electrode having excellent viscosity stability and a non-aqueous secondary battery having excellent cycle characteristics. The binder composition for a non-aqueous secondary battery electrode contains: a polymer that includes a monomer unit including a functional group that is bondable with a cationic group and a (meth)acrylic acid ester monomer unit; and an organic compound that includes at least two cationic groups. The binder composition for a non-aqueous secondary battery electrode has a viscosity change rate of 400% or less when left at rest at a temperature of 60 C. for 30 days.

Improved negative electrodes can comprise a silicon based active material blended with graphite to provide more stable cycling at high energy densities. In some embodiments, the negative electrodes comprise a blend of polyimide binder mixed with a more elastic polymer binder with a nanoscale carbon conductive additive. Electrolytes have been formulated that provide for extended cycling of cells incorporating a mixture of a silicon-oxide based active material with graphite active material in negative electrodes that can be matched with positive electrodes comprising nickel rich lithium nickel manganese cobalt oxides to cells with unprecedented cycling properties for large capacity cell based on a silicon negative electrode active material.

Disclosed herein are electrochemical cells comprising electrodes prepared from layered materials omprising a substantially two-dimensional ordered array of cells having an empirical formula of M.sub.n+1X.sub.n, where M comprises a transition metal selected from the group consisting of a Group IIIB metal, a Group IVB metal, a Group VB metal, a Group VIB metal, and any combination thereof, X is C.sub.xN.sub.y wherein x+y=n, and n is equal to 1, 2, or 3. Also disclosed herein are batteries comprising the electrochemical cells and methods for electrochemically preparing MXene compositions with the use of the electrochemical cells.