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Electrochemical characteristics of layered Li$$_{1.95}$$Mn$$_{0.9}$$Co$$_{0.15}$$O$$_{3}$$ (${it C}$2/${it m}$) as a lithium-battery cathode

リチウムイオン2次電池用正極材・層状Li$$_{1.95}$$Mn$$_{0.9}$$Co$$_{0.15}$$O$$_{3}$$の電気化学的特性

小澤 清*; 中尾 靖宏*; 茂筑 高士*; Cheng, Z.*; Wang, L.*; 岩井 秀夫*; 土屋 佳則*; 藤井 宏樹*; 井川 直樹

Ozawa, Kiyoshi*; Nakao, Yasuhiro*; Mochiku, Takashi*; Cheng, Z.*; Wang, L.*; Iwai, Hideo*; Tsuchiya, Yoshinori*; Fujii, Hiroki*; Igawa, Naoki

リチウムイオン2次電池正極材Li$$_{1.95}$$Mn$$_{0.9}$$Co$$_{0.15}$$O$$_{3}$$を共沈法によって作製し、その電気化学的特性を解析した。中性子回折実験及びRietveld解析によって求めた本材料の結晶構造は、空間群${it C}$2/${it m}$のLi$$_{2}$$MnO$$_{3}$$型と同定できた。本材料の充放電サイクル特性は、電流密度が30mAhg$$^{-1}$$の場合は、2.0-4.8Vの電圧域で最初からの11サイクルまでに放電能が46.3から196.5mAhg$$^{-1}$$へと増加し、その後23から58サイクルでは175.5mAhg$$^{-1}$$を保持していた。サイクリックボルタモグラム及びX線光電子分光実験の結果から、本材料では最初の10サイクル程度でMnの還元反応が活性化されていることが明らかとなった。

A manganese-based solid solution with the composition of Li$$_{1.95}$$Mn$$_{0.9}$$Co$$_{0.15}$$O$$_{3}$$ was synthesized by a simplified coprecipitation method, and its electrochemical characteristics as a lithium-battery cathode were investigated. Rietveld refinement based on neutron diffraction data revealed that the material is assigned to an Li$$_{2}$$MnO$$_{3}$$-type structure model with a space group symmetry of ${it C}$2/${it m}$. In cycling of the cell in the potential range from 2.0 to 4.8 V at current densities of 30 mAhg$$^{-1}$$, the discharge capacity characteristically increases from 46.3 to 196.5 mAhg$$^{-1}$$ as the cycle increases from 1 to 11, and a discharge capacity above 175.5 mAhg$$^{-1}$$ is obtained between the 23rd and 58th cycles. The cyclic voltammogram and X-ray photoelectron spectroscopy measurements showed that the manganese redox reaction is progressively activated during the first ten-odd cycles.

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パーセンタイル:56.93

分野:Electrochemistry

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