The invention relates to a solid composite electrolyte comprising : i) at least one solid inorganic particle, ii) at least one ionic liquid electrolyte, and iii) at least one ionically non-conductive polymer, wherein the at least one solid inorganic particle i) is ionic conductive and is blended with the at least one ionic liquid electrolyte ii). The invention also relates to a process for manufacturing the solid composite electrolyte, to a solid state battery comprising the solid composite electrolyte, and to the use of said solid composite electrolyte in a solid state battery for improving ionic conductivity and mechanical properties.

A lithium-ion secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a positive electrode active material. The electrolytic solution includes a cyclic sulfuric acid ester compound, a cyclic ether compound, and a chain alkyl dinitrile compound. A ratio of a weight (mg) of the cyclic sulfuric acid ester compound to a weight (g) of the positive electrode active material is from 0.01 to 2.

A lithium-ion secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a positive electrode active material. The electrolytic solution includes a cyclic sulfuric acid ester compound, a cyclic ether compound, and a chain alkyl dinitrile compound. A ratio of a weight (mg) of the cyclic sulfuric acid ester compound to a weight (g) of the positive electrode active material is from 0.01 to 2.

The present invention relates to a method of preparing a lithium difluorophosphate crystal. More particularly, the present invention relates to a method of preparing a high-purity lithium difluorophosphate crystal at a high yield, and the high-purity lithium difluorophosphate crystal prepared by the method can be used for various purposes.

An anode material for an electrochemical cell comprises a matrix material:distributed material composite, which comprises one or more alkali metals and/or alkali earth metals. The distributed material may comprise a metal other than that of the matrix material, such as a transition and/or post transition metal. The anode material may be all or part of an anode for an electrochemical cell, which may further comprises a current collector and/or an SEI layer. The electrolyte may comprises an alkali metal and/or alkali earth metal and/or a transition metal and/or post transition metal containing electrolyte salt. The matrix material and/or the distributed material may comprise one or more of the metals of the electrolyte salt. All or part of the anode may be used as a substrate for electro-deposition of one or more matrix materials during charging and/or all or part of the anode may be used as a source of matrix material during discharging. The electrolyte may further comprise one or more electrolyte additives. The anode material may be produced by mixing a matrix material and distributed material and heating the mixture to selectively melt the matrix material to produce a matrix material:distributed material composite. The composite may be further chemically or mechanically processed to reduce the size of the distributed material and/or to increase the homogeneity of the matrix material:distributed material composite. The anode material, the anode or the electrochemical cell may be used in a device.

An anode material for an electrochemical cell comprises a matrix material:distributed material composite, which comprises one or more alkali metals and/or alkali earth metals. The distributed material may comprise a metal other than that of the matrix material, such as a transition and/or post transition metal. The anode material may be all or part of an anode for an electrochemical cell, which may further comprises a current collector and/or an SEI layer. The electrolyte may comprises an alkali metal and/or alkali earth metal and/or a transition metal and/or post transition metal containing electrolyte salt. The matrix material and/or the distributed material may comprise one or more of the metals of the electrolyte salt. All or part of the anode may be used as a substrate for electro-deposition of one or more matrix materials during charging and/or all or part of the anode may be used as a source of matrix material during discharging. The electrolyte may further comprise one or more electrolyte additives. The anode material may be produced by mixing a matrix material and distributed material and heating the mixture to selectively melt the matrix material to produce a matrix material:distributed material composite. The composite may be further chemically or mechanically processed to reduce the size of the distributed material and/or to increase the homogeneity of the matrix material:distributed material composite. The anode material, the anode or the electrochemical cell may be used in a device.

A battery system includes a positive electrode having a first material arranged to undergo chemical reaction during charging and/or discharging of the battery, a negative electrode having a second material arranged to undergo chemical reaction during charging and/or discharging of the battery, a separator disposed between the positive electrode and the negative electrode; and an electrolyte having a charge carrier, wherein the charge carrier is arranged to facilitate the chemical reaction of the first material during charging and/or discharging of the battery.

A battery system includes a positive electrode having a first material arranged to undergo chemical reaction during charging and/or discharging of the battery, a negative electrode having a second material arranged to undergo chemical reaction during charging and/or discharging of the battery, a separator disposed between the positive electrode and the negative electrode; and an electrolyte having a charge carrier, wherein the charge carrier is arranged to facilitate the chemical reaction of the first material during charging and/or discharging of the battery.

An ultracapacitor that includes an energy storage cell immersed in an advanced electrolyte system and disposed within a hermetically sealed housing, the cell electrically coupled to a positive contact and a negative contact, wherein the ultracapacitor is configured to output electrical energy within a temperature range between about −40 degrees Celsius to about 210 degrees Celsius. Methods of fabrication and use are provided.

Components and structures for a rechargeable electrochemical cell and an electrochemical cell having an S02 solvent based electrolyte comprising any of said components and structures are provided. The cathode (2) may comprise one or more elemental transition metals and/or one or more partially oxidized transition metals. The S02 solvent based electrolyte (3) may comprise halide-containing salt additive as an SEI-forming additive. The anode current collector (5) may comprise a carbon coated metal, an alloy of two or more metals or a carbon coated alloy of two or more metals. The electrochemical cell may comprise excess non-dissolved/solid alkali halides. The components, structures and cell may bay used in a device.