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Junichi Imaizumi

Sony Broadcast & Professional Research Laboratories

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Featured researches published by Junichi Imaizumi.

Key Engineering Materials | 2013

Structure and Electrochemical Properties of O3-Type Layered LixMn0.5Ni0.25Ti0.25O2 Prepared by Ion-Exchange

Naoya Ishida; Hiroshi Hayakawa; Junji Akimoto; Hideka Shibuya; Junichi Imaizumi

Li0.55Na0.03Mn0.5Ni0.25Ti0.25O2 was prepared via Na/Li ion exchange from Na0.7Mn0.5Ni0.25Ti0.25O2 as a starting compound. Li0.55Na0.03Mn0.5Ni0.25Ti0.25O2 is a layered rocksalt-type oxide with the O3 structure. The electrochemical lithium insertion/extraction properties of O3-Li0.55Na0.03Mn0.5Ni0.25Ti0.25O2 exhibits a reversible capacity of approximately 190 mAh g-1 in the voltage range between 2.0 and 4.8 V. The voltage profile consists of two plateaus around 4.0 and 3.0 V. The layered structure remains unchanged and does not transform to the spinel structure during cycling.

Journal of Power Sources | 2011

Synthesis and electrochemical characterization of Fe and Ni substituted Li2MnO3―An effective means to use Fe for constructing Co-free Li2MnO3 based positive electrode material

Mitsuharu Tabuchi; Yoko Nabeshima; Tomonari Takeuchi; Hiroyuki Kageyama; Kuniaki Tatsumi; Junji Akimoto; Hideka Shibuya; Junichi Imaizumi

Journal of Power Sources | 2013

Synthesis of high-capacity Ti- and/or Fe-substituted Li2MnO3 positive electrode materials with high initial cycle efficiency by application of the carbothermal reduction method

Mitsuharu Tabuchi; Yoko Nabeshima; Tomonari Takeuchi; Hiroyuki Kageyama; Junichi Imaizumi; Hideka Shibuya; Junji Akimoto

Thin Solid Films | 2004

Production of semiconductor grade high-purity iron

Masahito Uchikoshi; Junichi Imaizumi; Hideka Shibuya; Tamás Kékesi; Kouji Mimura; Minoru Isshiki

Journal of Power Sources | 2015

Mn source effects on electrochemical properties of Fe -and Ni-substituted Li2MnO3 positive electrode material

Mitsuharu Tabuchi; Mitsunori Kitta; Hiroyuki Kageyama; Hideka Shibuya; Junichi Imaizumi

Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science | 2010

Preparation of High-Purity Cobalt by Anion-Exchange Separation and Plasma Arc Melting

Masahito Uchikoshi; Hideka Shibuya; Junichi Imaizumi; Tamas Kekesi; Kouji Mimura; Minoru Isshiki

Journal of Power Sources | 2013

Synthesis and electrochemical properties of layered Li1.0Mn0.82Ni0.10Ti0.08O2 prepared by chemical lithium insertion

Naoya Ishida; Hiroshi Hayakawa; Hideka Shibuya; Junichi Imaizumi; Junji Akimoto

Journal of Power Sources | 2013

Soft chemical synthesis and electrochemical properties of Li0.90Mn0.90Ti0.10O2 with the Na0.44MnO2-type tunnel structure

Junji Akimoto; Hiroshi Hayakawa; Naoya Ishida; Fuji Funabiki; Hideka Shibuya; Junichi Imaizumi

Journal of The Electrochemical Society | 2013

Soft Chemical Synthesis and Electrochemical Properties of Li0.82MnO2 with the Na0.44MnO2-Type Tunnel Structure

Naoya Ishida; Hiroshi Hayakawa; Hideka Shibuya; Junichi Imaizumi; Junji Akimoto

Journal of The Japan Society of Powder and Powder Metallurgy | 2013

Synthesis and Ti Substitution Effect of Fe-Substituted Li2MnO3 Positive Electrode Material

Mitsuharu Tabuchi; Yoko Nabeshima; Tomonari Takeuchi; Hiroyuki Kageyama; Kuniaki Tatsumi; Kazumi Tanimoto; Junji Akimoto; Hideka Shibuya; Junichi Imaizumi

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