Abstract: Provided is a method for treating waste lithium-ion batteries, the method capable of providing battery powder without treatment of fluorine generated by thermal decomposition. In the present invention, a waste lithium-ion battery is heat-treated in a range of temperatures equal to or more than a temperature at which an electrolytic solution is evaporated to dryness and less than a temperature at which fluororesin is thermally decomposed.

Abstract: The technology makes wireless roaming decisions for a computing device. The device is configured to determine whether to consider roaming and to generate a roam reason. The device determines a quality score for at least one access point within a wireless communication range of the device based at least in part on the roam reason. A target access point with a highest quality score is selected. The device may then determine to roam to the target access point, if the target access point is not the current access point to which the device is connected.

Abstract: Provided is a method for producing a high-purity aqueous lithium salt solution, the method allowing filtering aluminum phosphate in a short time. The method for producing a high-purity aqueous lithium salt solution includes: a step of adjusting the pH of a slurry containing a mixture of lithium phosphate and aluminum hydroxide obtained from a first aqueous lithium salt solution being a raw material to a range of 2 to 3 to obtain a precipitate of aluminum phosphate; a step of filtering off and removing the precipitate of aluminum phosphate to obtain a second aqueous lithium salt solution; and a step of purifying the second aqueous lithium salt solution to obtain a high-purity aqueous lithium salt solution.

Abstract: A lithium carbonate production device is provided which can efficiently produce lithium carbonate without requiring a large pressure for supplying carbon dioxide gas, by a simple structure. A lithium carbonate production device (1) includes: a sealed reaction tank (2) which stores a lithium hydroxide aqueous solution A; a supply unit (3) for the lithium hydroxide aqueous solution; a carbon dioxide gas supply unit (4); a circulation unit (21) for the lithium hydroxide aqueous solution; and a nozzle which is provided at the head of the circulation unit (21) for the lithium hydroxide aqueous solution, and has a diameter which gradually decreases from a base end side to a head side.

Abstract: A lithium carbonate production device is provided which can efficiently produce lithium carbonate without requiring a large pressure for supplying carbon dioxide gas, by a simple structure. A lithium carbonate production device (1) includes: a sealed reaction tank (2) which stores a lithium hydroxide aqueous solution A; a supply unit (3) for the lithium hydroxide aqueous solution; a carbon dioxide gas supply unit (4); a circulation unit (21) for the lithium hydroxide aqueous solution; and a nozzle which is provided at the head of the circulation unit (21) for the lithium hydroxide aqueous solution, and has a diameter which gradually decreases from a base end side to a head side.