鱗片状Si粉末へのカーボンコーティングとリチウムイオン電池負極特性
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概要
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To reduce the high irreversible capacity (Qirr) of Si thin flake (Si-LP) negative electrode, carbon-coated Si-LPs were prepared using citric acid as a precursor and their charge/discharge properties were investigated as negative electrodes in lithium-ion batteries. The carbon-coated powder was homogeneously coated with a thin carbon layer (8–10 and 6–8 nm in thickness for Si-LPs heat-treated at 600 and 700°C, respectively, 14 wt% for each). The irreversible capacity Qirr was successfully reduced to about a half (ca. 1100 mAh g−1) of that of the pristine Si-LP (2336 mAh g−1), though the cycleability was slightly deteriorated. The cycleability of Si-LP@Cs was significantly improved by the addition of 10 wt% VC in the electrolyte solution. Si-LP@C(700°C) kept high discharge capacities over 2000 mAh g−1 even after 50 cycles with a reduced Qirr of ca. 1300 mAh g−1 compared with the pristine Si-LP (ca. 2450 mAh g−1).
著者
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Inaba Minoru
Department Of Energy And Hydrocarbon Chemistry Graduate School Of Engineering Kyoto University
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SAITO Morihiro
Department of Chemistry, Rikkyo University
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TASAKA Akimasa
Department of Molecular Science and Technology, Faculty of Engineering, Doshisha University
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Okubo Takashi
Department Of Chemistry Graduate School Of Science Tokyo Metropolitan University
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Yamada Tomoyuki
Department Of Cardiology Showa General Hospital
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YODOYA Chihiro
Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University
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KAMEI Akika
Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University
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HIROTA Masato
Oike & Co., Ltd.
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TAKENAKA Toshio
Oike & Co., Ltd.
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TAKENAKA Toshio
Oike & Co., Ltd.
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TASAKA Akimasa
Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University
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INABA Minoru
Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University
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YAMADA Tomoyuki
Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University
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SAITO Morihiro
Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University
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HIROTA Masato
Oike & Co., Ltd.
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INABA Minoru
Department of Applied Chemistry, Graduate School of Engineering, Doshisha University
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TASAKA Akimasa
Department of Applied Chemistry, Graduate School of Engineering, Doshisha University
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