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Electrode properties of Li$$_{2}$$MnO$$_{3}$$ (${it C}$2/${it m}$) for a lithium-battery cathode in several charge-discharge potential ranges

さまざまな充放電ポテンシャル領域におけるリチウム電池正極材料Li$$_{2}$$MnO$$_{3}$$(${it C}$2/${it m}$)の電極特性

中尾 靖宏*; 小澤 清*; 藤井 宏樹*; 茂筑 高士*; 岩井 秀夫*; 土屋 佳則*; 井川 直樹

Nakao, Yasuhiro*; Ozawa, Kiyoshi*; Fujii, Hiroki*; Mochiku, Takashi*; Iwai, Hideo*; Tsuchiya, Yoshinori*; Igawa, Naoki

リチウムイオン電池用正極材Li$$_{2}$$MnO$$_{3}$$(空間群;${it C}$2/${it m}$)を共沈法によって作製し、2.0-4.6, 2.0-4.8及び2.0-5.0V領域における充放電サイクル特性を解析した。すべての測定領域において、充放電サイクルを重ねることで電気化学キャパシティは徐々に増加するが、その増加傾向は電圧域に依存した。すなわち、2.0-4.6Vの電圧域では、放電能は1サイクルでの12.5mAh$$^{-1}$$から99サイクルでの22.5mAh$$^{-1}$$程度の増加に対し、2.0-5.0Vの電圧域では、20.0から110.2mAh$$^{-1}$$へと大幅に増加した。中性子回折実験の結果、2.0-5.0Vの電圧域における放電能の大幅な増加は、充放電サイクルを重ねるにしたがって、斜方面体相が発生するためであることを見いだした。

Li$$_{2}$$MnO$$_{3}$$ powder with a monoclinic cell related to the space group of ${it C}$2/${it m}$ was synthesized by a simplified coprecipitation method. Its electrode properties as a lithium-battery cathode were investigated in the charge-discharge potential ranges of 2.0 - 4.6, 2.0 - 4.8, and 2.0 - 5.0 V. In all the potential ranges, the electrochemical capacities gradually increased during cycling, and the increased capacities significantly depended on the potential ranges. Compared to the discharge capacities for the potential ranges of 2.0 - 4.6 and 2.0 - 5.0 V, the former merely increased from 12.5 to 22.5 mAhg$$^{-1}$$ between the 1st and 99th cycles, whereas the latter increased from 20.0 to 110.2 mAhg$$^{-1}$$ during the same cycling. The structural variation in Li$$_{2}$$MnO$$_{3}$$ is induced by the cycling, the rhombohedral phase is detected during cycling in the potential range of 2.0 - 5.0 V.

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