Kabushiki Kaisha Toshiba

Hirofumi Yasumiishi

Yasuhiro Harada

Norio Takami

Keigo Hoshina

Kazuki Ise

Tetsuya Sasakawa

Tomoko Sugizaki

Arisa Yamada

Tomoe Kusama

Yuta Kanai

According to one embodiment, a method of producing a secondary battery is provided. The method includes preparing a battery architecture including a positive electrode, a negative electrode, and an electrolyte; adjusting a positive electrode potential to a range of 3.4 V to 3.9 V and a negative electrode potential to a range of 1.5 V to 2.0 V based on an oxidation-reduction potential of lithium, thereby providing a potential adjusted state; and holding the battery architecture in the potential adjusted state at a holding temperature of 50° C. to 90° C. The positive electrode includes a lithium-nickel-cobalt-manganese composite oxide. The negative electrode includes a niobium-titanium composite oxide. The electrolyte includes one or more first organic solvent having a viscosity of 1 cP or less.

Method of producing a secondary battery, and secondary battery

According to one embodiment, provided is an active material including a composite oxide having a tetragonal crystal structure. The composite oxide is represented by general formula LiTiNbMO. Here, M is one selected from the group consisting of W and Mo, 0≤a≤b+4+3c, 0<b<2−2d, and 0<c<2−4d.

Active material, electrode, secondary battery, battery pack, and vehicle

Growing community of inventors

Kawasaki, Japan

Hirofumi Yasumiishi