Mechano-chemical Synthesis of Lithium Ion Conducting Materials in the System Li_2O-Li_2S-P_2S_5
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概要
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Amorphous solid electrolytes were prepared in the compositions 75 {(1-x)Li<SUB>2</SUB>O⋅xLi<SUB>2</SUB>S}⋅5P<SUB>2</SUB>S<SUB>5</SUB> (mol%) by using a high-energy ball-milling process. The amorphous materials showed lithium ion conductivities higher than 10<SUP>-3</SUP> Sm<SUP>-1</SUP> at room temperature. The amorphous 7.5Li<SUB>2</SUB>O⋅67.5Li<SUB>2</SUB>S⋅5P<SUB>2</SUB>S<SUB>5</SUB> (mol%) sample showed the highest lithium ion conductivity σ<SUB>298K</SUB>=2.7×10<SUP>-2</SUP> Sm<SUP>-1</SUP> at room temperature among the obtained samples. An all-solid-state battery was assembled by using the amorphous 7.5Li<SUB>2</SUB>O⋅67.5Li<SUB>2</SUB>S⋅5P<SUB>2</SUB>S<SUB>5</SUB> sample as solid electrolytes. In the battery, TiS<SUB>2</SUB> and Li<SUB>4.4</SUB>Si were employed as positive and negative electrode materials, respectively. The discharge-charge cycling test of the battery was carried out at room temperature under a constant current density of 64μAcm<SUP>-2</SUP> with the discharge-charge criteria of voltages 1.1 and 2.6 V. The battery showed successive reversibility with a large specific capacity; the specific capacity calculated on the base of the weight of the TiS<SUB>2</SUB> positive electrode materials was about 170 mAhg<SUP>-1</SUP>.
- 社団法人 粉体粉末冶金協会の論文
- 2004-02-15
著者
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Machida Nobuya
Department Of Chemistry Konan University
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Shigematsu Toshihiko
Department Of Chemistry Faculty Of Science Konan University
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YONEDA Yuki
Department of Medicine, Institute of Gastoenterotogy, Tokyo Women's Medical University
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Yoneda Yuki
Department Of Chemistry Konan University
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Yoneda Yuki
Department Of Cardiovascular Surgery Juntendo University School Of Medicine
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