Hideyuki Kawasoko
Tohoku University
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Publication
Featured researches published by Hideyuki Kawasoko.
ACS Applied Materials & Interfaces | 2018
Hideyuki Kawasoko; Susumu Shiraki; Toru Suzuki; Ryota Shimizu; Taro Hitosugi
Solid-state Li batteries containing Li(Ni0.5Mn1.5)O4 as a 5 V-class positive electrode are expected to revolutionize mobile devices and electric vehicles. However, practical applications of such batteries are hampered by the high resistance at their solid electrolyte/electrode interfaces. Here, we achieved an extremely low electrolyte/electrode interface resistance of 7.6 Ω cm2 in solid-state Li batteries with Li(Ni0.5Mn1.5)O4. Furthermore, we observed spontaneous migration of Li ions from the solid electrolyte to the positive electrode after the formation of the electrolyte/electrode interface. Finally, we demonstrated stable fast charging and discharging of the solid-state Li batteries at a current density of 14 mA/cm2. These results provide a solid foundation to understand and fabricate low-resistance electrolyte/electrode interfaces.
APL Materials | 2017
Issei Sugiyama; Ryota Shimizu; Tohru Suzuki; Kuniko Yamamoto; Hideyuki Kawasoko; Susumu Shiraki; Taro Hitosugi
We prepared a nonvolatile memory device that could be reversibly switched between a high and a low open-circuit voltage (Voc) regime. The device is composed of a solid electrolyte Li3PO4 film sandwiched between metal Li and Au electrodes: a Li/Li3PO4/Au heterostructure, which was fabricated at room temperature on a glass substrate. The bistable states at Voc ∼ 0.7 and ∼0.3 V could be reversibly switched by applying an external voltage of 2.0 and 0.18 V, respectively. The formation and deformation of an ultrathin Au–Li alloy at the Li3PO4/Au electrode interface were the origin of the reversible switching.
Thin Solid Films | 2017
Hideyuki Kawasoko; Ryota Shimizu; Yoshitaka Takagi; Kuniko Yamamoto; Issei Sugiyama; Susumu Shiraki; Taro Hitosugi
The Japan Society of Applied Physics | 2018
Kota Matsumoto; Hideyuki Kawasoko; Tomoteru Fukumura
The Japan Society of Applied Physics | 2016
Hideyuki Kawasoko; Susumu Shiraki; Toru Suzuki; Ryota Shimizu; Taro Hitosugi
The Japan Society of Applied Physics | 2016
Hideyuki Kawasoko; Shiraki Susumu; Toru Suzuki; Ryota Shimizu; Taro Hitosugi
The Japan Society of Applied Physics | 2016
Hideyuki Kawasoko; Susumu Shiraki; Tetsuro Shirasawa; Toru Suzuki; Taro Hitosugi
PRiME 2016/230th ECS Meeting (October 2-7, 2016) | 2016
Susumu Shiraki; Hideyuki Kawasoko; Tohru Suzuki; Ryota Shimizu; Taro Hitosugi
The Japan Society of Applied Physics | 2015
Hideyuki Kawasoko
The Japan Society of Applied Physics | 2015
Susumu Shiraki; Toru Suzuki; Hideyuki Kawasoko; Ryota Shimizu; Tetsuro Shirasawa; Taro Hitosugi