National Institute of Advanced Industrial Science and Technology

Titus Nyamwaro Masese

Hikari Sakaebe

Hiroshi Senoh

Masahiro Shikano

Hikaru Sano

By using a potassium ion secondary battery positive electrode active material comprising a potassium compound represented by general formula (1): KMO, wherein M is copper or iron, n is 0.5 to 3.5, and m is 1.5 to 2.5, provided is a potassium ion secondary battery positive electrode active material having higher theoretical discharge capacity and higher effective capacity than a potassium secondary battery using Prussian blue as a positive electrode active material.

Positive electrode active material for potassium ion secondary cell

Provided is a material that can be used as a potassium secondary battery positive electrode active material (particularly a potassium ion secondary battery positive electrode active material), other than Prussian blue, by using a potassium compound and a potassium ion secondary battery positive electrode active material comprising the potassium compound, the potassium compound being represented by general formula (1):KABO,wherein A is a positive divalent element in groups 7 to 11 of the periodic table; B is positive tetravalent silicon, germanium, titanium or manganese, excluding a case in which A is manganese and B is titanium, and a case in which A is cobalt and B is silicon; n is 1.5 to 2.5; and m is 3.5 to 4.5.

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Osaka, Japan

Titus Nyamwaro Masese