Minebea Mitsumi Inc.

Mt Carbon Co., Ltd.

Kohei Yamaguchi

Seiji Okazaki

Akio Sakamoto

Wataru Oda

Yoshiki Kubo

Yohei Yagishita

Junichi Igawa

Miwa Katayama

Akemi Inami

Noriyuki Yatabe

A position determination device includes: a communication unit including communication devices to perform wireless communication with a mobile terminal, the communication devices to repeatedly perform UWB communication for detecting a distance measurement value Vr, at least one of the communication devices being configured to repeatedly perform BLE communication for receiving the movement value Vm; a main position determination unit to determine a first coordinate position Pf(n) as a position of the mobile terminal, based on distance measurement values Vr; a sub-position determination unit to determine a second coordinate position Ps(n) as a position of the mobile terminal, based on the movement value Vm; and a determination position setting unit to set any one of the first coordinate position Pf(n) and the second coordinate position Ps(n) as a determination coordinate position Pj(n) that is a current position of the mobile terminal.

Position determination device

A graphite material for a negative electrode of a lithium-ion secondary battery is provided. A ratio Lc(112)/Lc(006) defined as a ratio of expansion of graphene sheets to sheet displacement ranges from 0.08 to 0.11, both inclusive. A crystallite size Lc(006) calculated from a wide-angle X-ray diffraction line ranges from 30 nm to 40 nm, both inclusive. An average particle size ranges from 3 &#x3bc;m to 20 &#x3bc;m, both inclusive.

Graphite material for negative electrode of lithium-ion secondary battery, lithium-ion secondary battery including the graphite material, and method of manufacturing graphite material for lithium-ion secondary battery

Growing community of inventors

Hiroshima, Japan

Kohei Yamaguchi