Kenji Okahara
Mitsubishi Chemical Corporation
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Kenji Okahara.
Journal of Power Sources | 2001
Takayuki Aoshima; Kenji Okahara; Chikara Kiyohara; Kenji Shizuka
Abstract Tests on the stability of spinels stored at different states of charge were performed. It was found that Mn dissolution took place irreversibly from the charged state with formation of MnF 2 , ramsdellite–Li 0.5 MnO 2 . In the discharged state, the Mn at the surface of the LiMn 2 O 4 was in equilibrium with a soluble species, which leads to an increase in the cathode resistance. It was found that the amount of the dissolved Mn increased with increasing LiPF 6 concentration and that 2xa0equiv. of PO 2 F 2 − were generated. Concurrent formation of carbonate decomposition products, such as CO 2 , C 2 H 4 , EtOH, Et 2 O, and AcOEt, suggests that the mechanism of Mn dissolution from the charged state was composed of the following steps: the initial decarboxylation of electrolyte catalyzed by λMnO 2 to give EtOH, followed by reduction of λMnO 2 by EtOH to give acetate and MnO, and then Mn dissolution via Mnue5f8O bond activation assisted by LiPF 6 .
Archive | 2005
Kenji Shizuka; Kenji Okahara
Archive | 2007
Kenji Shizuka; Kenji Okahara; Hiroyuki Imura; Kaoru Terada
Archive | 2008
Kenji Shizuka; Kaoru Terada; Kenji Okahara; Tomohiro Kusano
Archive | 2006
Kenji Shizuka; Kenji Okahara
Archive | 1999
Kenji Shizuka; Kenji Okahara
Archive | 2007
Kazuhiro Kikuchi; Kenji Okahara; Kenji Shizuka; Kaoru Terada
Archive | 2007
Kenji Shizuka; Kenji Okahara; Kazuhiro Kikuchi; Kaoru Terada
Archive | 2008
Kenji Shizuka; Kaoru Terada; Kenji Okahara; Tomohiro Kusano
Archive | 1998
Denis G. Fauteux; Jie Shi; Kazuko Otani; Eitaro Takahashi; Kenji Okahara