Patents by Inventor Masafumi HIRATSUKA

Masafumi HIRATSUKA has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • METHOD FOR PRODUCING POSITIVE ELECTRODE ACTIVE MATERIAL FOR ALKALI ION SECONDARY BATTERIES
    Publication number: 20240116759
    Abstract: Provided is a method for producing a positive electrode active material for an alkali ion secondary battery, the positive electrode active material containing a large amount of a transition metal and enabling operation of the battery. In the method for producing a positive electrode active material for an alkali ion secondary battery, in which the positive electrode active material contains 34 mol % or more of CrO+FeO+MnO+CoO+NiO, the method includes: a step of preparing a positive electrode active material precursor containing crystals; and a step of irradiating the positive electrode active material precursor with light to melt the crystals and amorphize at least a portion of the positive electrode active material precursor.
    Type: Application
    Filed: February 3, 2022
    Publication date: April 11, 2024
    Inventors: Tsuyoshi HONMA, Masafumi HIRATSUKA, Hideo YAMAUCHI, Ayumu TANAKA, Kei TSUNODA, Yoshinori YAMAZAKI