Sanyo Electric Co., Ltd.

C/o Intellectual Property H.q., Sanyo Electric Co., Ltd.

Masaharu Itaya

Masahisa Fujimoto

Takao Inoue

Masahide Miyake

Hideyuki Koga

Shin Fujitani

Hisaki Tarui

Motoharu Saito

Kumiko Kanai

An object of the invention is to provide an inexpensive non-aqueous electrolyte secondary battery that allows reversible charge and discharge to be carried out and can be used for a long period because of a stable non-aqueous electrolyte used therein. The invention provides a non-aqueous electrolyte secondary battery including a positive electrode including a positive electrode active material and capable of storing and releasing sodium, a negative electrode capable of storing and releasing sodium, and a non-aqueous electrolyte, and the positive electrode active material includes sodium, nickel, manganese, and a transition metal that can exist in a hexavalent state. An example of the transition metal that can exist in a hexavalent state may include tungsten (W). An example of the negative electrode may include a sodium metal capable of storing and releasing sodium ions.

Non-aqueous electrolyte secondary battery

As a positive electrode active material, a lithium transition metal complex oxide having a layered rock-salt structure containing lithium (Li) and containing magnesium atoms (Mg) substituted for part of lithium atoms (Li) is used. The lithium transition metal complex oxide is formed by chemical or electrochemical substitution of Mg atoms for part of Li atoms in LiCoO, LiMnO, LiFeO, LiNiO, or the like. A cell is prepared in which a negative electrodeand a positive electrodeincluding the lithium transition metal complex oxide (positive electrode active material) are disposed in a non-aqueous electrolyteincluding a lithium salt, and part of Li in the lithium transition metal complex oxide is extracted by discharging the cell. Then, the electrolyte including Li is replaced with an electrolyte including Mg, and the cell is discharged, so that Mg atoms are substituted for the part of Li atoms in the lithium transition metal complex oxide.

Non-aqueous electrolyte secondary battery, positive electrode active material and method of manufacturing the same

The positive electrode active material of a positive electrode includes a sodium-containing transition metal oxide (NaLiMO). The M includes at least two of manganese (Mn), iron (Fe), cobalt (Co), and nickel (Ni). For a negative electrode, a sodium metal or a metal that forms an alloy with sodium is used. A non-aqueous electrolyte produced by dissolving an electrolytic salt (sodium salt) in a non-aqueous solvent is used. Examples of the non-aqueous solvent may include a cyclic carbonate, a chain carbonate, esters, cyclic ethers, chain ethers, nitrites, amides and a combination thereof.

Sodium ion secondary battery

In a non-aqueous electrolyte secondary cell including a positive electrode, a negative electrode and a non-aqueous electrolyte, the negative electrode includes a material capable of absorbing or releasing lithium and wherein the non-aqueous electrolyte contains a room-temperature molten salt having a melting point of 60&#xb0; C. or less and a lithium salt.

Non-aqueous electrolyte secondary cell

A nonaqueous electrolyte battery which comprises a positive electrode including carbon fluoride or sulfur as an active material, a negative electrode including calcium as an active material, and an electrolyte including an imide salt of calcium or a sulfonic acid salt of calcium.

Nonaqueous electrolyte battery

An electrolyte containing calcium bistrifluoromethanesulfonimide [Ca((CFSO)N)] for a nonaqueous battery. The calcium bistrifluoromethanesulfonimide is soluble in an organic solvent and a molten salt having a melting point of not greater than 60&#xb0; C.

Growing community of inventors

Kobe, Japan

Masaharu Itaya