Toyota Jidosha Kabushiki Kaisha

Yuichi Hashimoto

Hiroki Kubo

Keisuke Watanabe

Koichi Sugiura

Keisuke Omori

Takayoshi Doi

Takuo Yanagi

Yoshiyuki Nagasawa

Takayuki Koyama

A method of easily separating a solid electrolyte and a cathode active material which are contained in a slurry is disclosed. The method of separating a solid electrolyte and a cathode active material which are contained in a slurry includes: adding a fluorine-based solvent to the slurry containing the solid electrolyte and the cathode active material, the cathode active material containing at least one selected from nickel, cobalt and manganese as a constituent element.

Method of separating solid electrolyte and cathode active material which are contained in slurry

A main object of the present disclosure is to provide a method for producing a sulfide solid electrolyte material, the method that allows a concentration of lithium halide to increase and that allows drying at a low temperature. The present disclosure achieves the object by providing a method for producing a sulfide solid electrolyte material, the method comprising: a drying step of drying a precursor aqueous solution containing LiI, LiBr, and LiOH to remove water and obtain a precursor mixture; and an electrolyte synthesizing step including a sulfidization treatment to sulfurize the LiOH in the precursor mixture and obtain LiHS, a de-sulfide-hydrogenating treatment to desorb a hydrogen sulfide from the LiHS and obtain LiS, and a synthesizing treatment to make the LiS to react with an auxiliary material; wherein a molar ratio of the LiOH with respect to the LiI and the LiBr, LiOH/(LiI+LiBr), in the precursor aqueous solution is 3 or more and less than 6.

Method for producing sulfide solid electrolyte material that allows a concentration of lithium halide to increase and that allows drying at a low temperature

A method for producing a lithium composition capable of suppressing the generation of polysulfides is provided. The method for producing a lithium composition includes a first aqueous solution forming step of forming a first aqueous solution by reacting iodine with a reducing aqueous solution containing calcium oxide, formic acid, and water under a condition of a pH of 5.5 or more and a pH of 10.21 or less through heating, a second aqueous solution forming step of forming a second aqueous solution by adding calcium oxide to the first aqueous solution, a third aqueous solution forming step of forming a third aqueous solution by adding lithium carbonate to the second aqueous solution, and a LiS forming step of forming the lithium sulfide (LiS) by sulfurizing lithium hydroxide (LiOH) to form lithium hydrosulfide (LiHS) and then eliminating hydrogen sulfide from lithium hydrosulfide (LiHS).

Method for producing lithium composition and method for producing sulfide solid electrolyte material

Provided is a method of manufacturing a negative electrode for a solid-state battery, the method including: a step of mixing a negative electrode active material, a sulfide solid electrolyte, a binder, and a solvent with each other to prepare a negative electrode slurry; a step of applying the prepared negative electrode slurry to a surface of a solid electrolyte layer of the solid-state battery or a substrate of the negative electrode; and a step of drying the applied negative electrode slurry. In this method, the solvent is butyl butyrate, and the binder is a copolymer containing a vinylidene fluoride (VDF) monomer unit and a hexafluoropropylene (HFP) monomer unit, in which a molar ratio of the HFP monomer unit to a total amount of the VDF monomer unit and the HFP monomer unit is 10% to 25%.

Method of manufacturing negative electrode for solid-state battery, method of manufacturing solid-state battery, and negative electrode slurry

A method for producing a sulfide solid electrolyte material includes a step of adding an ether compound to a coarse-grained material of a sulfide solid electrolyte material and microparticulating the coarse-grained material by a pulverization treatment.

Method for producing sulfide solid electrolyte materials

A main object of the present invention is to provide a practical slurry having a polar solvent as the dispersion medium for a sulfide solid electrolyte material. The present invention solves the above-mentioned problem by providing a slurry having: a sulfide solid electrolyte material, and a dispersion medium having at least one selected from the group consisting of tertiary amine; ether; thiol; ester having a functional group of a 3 or more carbon number bonded with a carbon atom of an ester bonding and a functional group of a 4 or more carbon number bonded with an oxygen atom of the ester bonding; and ester having a benzene ring bonded with a carbon atom of an ester bonding.

Slurry, production method for solid electrolyte layer, production method for electrode active material layer, and production method for all-solid-state battery

The present invention provides a method for producing an electrode for a solid battery which can improve battery performance. The method for producing an electrode for a solid battery comprises the steps of: mixing an active material, a solid electrolyte, a binder, and a solvent to make a slurry-form electrode composition; applying the slurry-form electrode composition made; and drying the slurry-form electrode composition applied, wherein the solvent includes a good solvent for the binder and a poor solvent for the binder.

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Numazu, Japan

Yuichi Hashimoto