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Dive into the research topics where Masamichi Onuki is active.

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Featured researches published by Masamichi Onuki.


Journal of The Electrochemical Society | 2008

Identification of the Source of Evolved Gas in Li-Ion Batteries Using #2#1 -labeled Solvents

Masamichi Onuki; Shinichi Kinoshita; Yuuichi Sakata; Miwa Yanagidate; Yumiko Otake; Makoto Ue; Masaki Deguchi

In order to elucidate the mechanism of gas evolution in lithium-ion batteries, we fabricated carbon-LiNi x ;Co y Al 1-x-y O 2 cells employing 13 C-labeled ethylene carbonate ( 13 C-EC) and diethyl carbonate ( 13 C-DEC) as solvent components and then stored them at 85°C. The gas species evolved during storage tests were analyzed by gas chromatography/atomic emission detector to determine the isotopic ratio of CO 2 and CO. The relative proportions of the CO 2 derived from EC, DEC, and nonsolvent components were determined to be 52, 11, and 37%, respectively. The main source of CO 2 was found to be EC. Further storage tests with either cathode or anode electrodes showed that the cathode components were a source of CO 2 , but anode components were not. As for evolved CO, the main source was found to be EC. Moreover, we also examined the gas-evolution behavior on the initial charge. The evolved gas species were mainly composed of H 2 , C 2 H 4 , and CO. A minor amount of C 2 H 6 was also detected. From our isotopic analysis it was shown that C 2 H 4 was exclusively formed from EC, while C 2 H 6 derived from DEC. In the case of CO, EC and nonsolvent components were found to be its sources. CO derived from DEC was not detected.


Archive | 2008

Nonaqueous electrolyte for secondary battery and nonaqueous-electrolyte secondary battery employing the same

Hiroyuki Tokuda; Takashi Fujii; Minoru Kotato; Masahiro Takehara; Masamichi Onuki; Youichi Ohashi; Shinichi Kinoshita


Archive | 2011

Nonaqueous electrolyte and lithium secondary battery employing the same

Masamichi Onuki; Minoru Kotato; Isao Konno; Shinichi Kinoshita; Noriko Shima


Archive | 2008

Nonaqueous electrolyte for rechargeable battery, and rechargeable battery with nonaqueous electrolyte

Hiroyuki Tokuda; Takashi Fujii; Minoru Kotato; Masahiro Takehara; Masamichi Onuki; Youichi Ohashi; Shinichi Kinoshita


Archive | 2009

Nonaqueous electrolytes and nonaqueous-electrolyte secondary batteries employing the same

Ryoichi Kato; Hiroyuki Tokuda; Takashi Fujii; Minoru Kotato; Masahiro Takehara; Masamichi Onuki; Youichi Ohashi; Shinichi Kinoshita


Archive | 2008

Nonaqueous electrolyte, and rechargeable battery with the nonaqueous electrolyte

Ryoichi Kato; Hiroyuki Tokuda; Takashi Fujii; Minoru Kotato; Masahiro Takehara; Masamichi Onuki; Youichi Ohashi; Shinichi Kinoshita


Archive | 2010

Non-aqueous Electrolytic Solution, And Non-aqueous Electrolyte Battery Comprising Same

Masamichi Onuki; Minoru Kotato; Koji Fukamizu; Yumiko Machida; Youichi Ohashi


Archive | 2013

Non-aqueous electrolyte solution and non-aqueous electrolyte secondary battery employing the same

Shuhei Sawa; Kunihisa Shima; Yasuyuki Shigematsu; Masamichi Onuki; Atsushi Watarai


Archive | 2007

Non-aqueous electrolytic solution for secondary battery and non-aqueous electrolytic solution secondary battery using the same

Takashi Fujii; Shinichi Kinoshita; Minoru Kotado; Masamichi Onuki; 稔 古田土; 正道 大貫; 信一 木下; 隆 藤井


Journal of Catalysis | 1996

Characterization and nitrile group hydrogenation study of supported and unsupported Ru-Co catalyst

Haruhiko Kusaka; Yoshinori Hara; Masamichi Onuki; Toshio Akai; Masami Okuda

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Hiroyuki Tokuda

Mitsubishi Chemical Corporation

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Youichi Ohashi

Mitsubishi Chemical Corporation

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Riichiro Kawashima

Mitsubishi Chemical Corporation

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Ryoichi Kato

Mitsubishi Chemical Corporation

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