An object of the present disclosure is to provide a fluoride-ion battery capable of achieving high charge and discharge capacities. The fluoride-ion battery of the present disclosure comprises a positive electrode active material layer, a negative electrode active material layer, and an electrolyte layer formed between the positive electrode active material layer and the negative electrode active material layer. In the fluoride-ion battery of the present disclosure, the negative electrode active material layer contains metallic magnesium, magnesium fluoride, and calcium barium fluoride, wherein a mass ratio of metallic magnesium to magnesium fluoride is 0.1 to 10.0.

A method of making an anti-perovskite solid electrolyte is provided. The method includes: providing an anti-perovskite material that is in the form of a powder; heating a die to a temperature between approximately 200 and 400? C.; loading the anti-perovskite powder into the heated die; compressing the anti-perovskite powder in the heated die; and allowing the heated die to cool to ambient temperature under pressure by maintaining the compression until the die has cooled to ambient temperature. The compression may be performed uniaxially and at a pressure in a range of 1 to 500 MPa. The anti-perovskite may undergo phase transformation, densification, and grain growth during compression at the elevated temperature. An anti-perovskite solid electrolyte formed by the method, and an anti-perovskite solid-state battery including the solid electrolyte are also provided.

The present disclosure provides an electrochemical storage cell including a battery. The battery includes an alkali metal anode having an anode Fermi energy, an electronically insulating, amorphous, dried solid electrolyte able to conduct alkali metal, having the general formula A.sub.3-xH.sub.xOX, in which 0x1, A is the alkali metal, and X is at least one halide, and a cathode including a cathode current collector having a cathode Fermi energy lower than the anode Fermi energy. During operation of the electrochemical storage cell, the alkali metal plates dendrite-free from the solid electrolyte onto the alkali metal anode. Also during operation of the electrochemical storage cell, the alkali metal further plates on the cathode current collector.

The present invention relates to a method for manufacturing a solid sulfide electrolyte by mixing of the solid electrolyte precursor comprising Li.sub.2S, Li.sub.3PS.sub.4 and LiX, such as LiCl. The present inventors have demonstrated that a low-energy mixing step is sufficient to prepare the solid electrolyte mixture, which after subjection to the heat-treatment affords the solid sulfide electrolyte having an argyrodite-type crystal structure in high purity.

A method of producing a sulfide solid electrolyte and a method of producing an electrode mixture are described. The method of producing the sulfide solid electrolyte includes a step of mixing a raw material inclusion containing a lithium atom, a phosphorous atom, a sulfur atom, and a halogen atom with at least one lithium oxoacid salt of lithium nitrate, lithium nitrite, lithium silicate, lithium borate, and lithium carbonate. The sulfide solid electrolyte has high ion conductivity and excellent reactivity with an electrode active material, especially a positive electrode active material.