The Experts below are selected from a list of 243 Experts worldwide ranked by ideXlab platform
Zempachi Ogumi - One of the best experts on this subject based on the ideXlab platform.
-
difference of rate performance between Discharge and charge Reactions for bismuth fluoride electrode in lithium ion battery
Journal of Electroanalytical Chemistry, 2017Co-Authors: Hiroaki Konishi, Taketoshi Minato, Zempachi OgumiAbstract:Abstract The conversion-based BiF3 is a promising cathode material for lithium-ion batteries due to its high theoretical capacity (302 mAh g−1). Nanocomposites of BiF3 and carbon (BiF3/C) are known to improve the electrochemical performance by increasing the electronic conductivity of the electrode. Here we investigate the electrochemical performance of BiF3/C at high C-rates. In particular, we newly investigate the difference of high C-rate performance between Discharge and charge Reactions. The Discharge and charge capacities in the first cycle were almost the same at 0.1 C. In contrast, the Discharge capacity was higher than charge capacity at 10 C. Further, during cycling at 10 C, the charge capacity drastically decreased, but the Discharge capacity remained high. The rate performance of the Discharge Reaction was higher than that of the charge Reaction, especially after cycling.
-
relationship between phase transition involving cationic exchange and charge Discharge rate in li2fesio4
Chemistry of Materials, 2014Co-Authors: Titus Masese, Takuya Mori, Yuki Orikasa, Hajime Arai, Taketoshi Minato, Cédric Tassel, Kentaro Yamamoto, Yoji Kobayashi, Hiroshi Kageyama, Zempachi OgumiAbstract:Li2FeSiO4 is considered a promising cathode material for the next-generation Li-ion battery systems owing to its high theoretical capacity and low cost. Li2FeSiO4 exhibits complex polymorphism and undergoes significant phase transformations during charge and Discharge Reaction. To elucidate the phase transformation mechanism, crystal structural changes during charge and Discharge processes of Li2FeSiO4 at different rates were investigated by X-ray diffraction measurements. The C/50 rate of lithium extraction upon initial cycling leads to a complete transformation from a monoclinic Li2FeSiO4 to a thermodynamically stable orthorhombic LiFeSiO4, concomitant with the occurrence of significant Li/Fe antisite mixing. The C/10 rate of lithium extraction and insertion, however, leads to retention of the parent Li2FeSiO4 (with the monoclinic structure as a metastable phase) with little cationic mixing. Here, we experimentally show the presence of metastable and stable LiFeSiO4 polymorphic phases caused by lithium ...
-
direct observation of lithium ion movement around an in situ formed negative electrode solid state electrolyte interface during initial charge Discharge Reaction
Electrochemistry Communications, 2012Co-Authors: Kazuo Yamamoto, Toru Asaka, Tsukasa Hirayama, Hideki Fujita, Katsumasa Nonaka, Kouji Miyahara, Yuji Sugita, Yasutoshi Iriyama, Zempachi OgumiAbstract:Abstract Solid-state lithium batteries (SSBs) are highly likely to replace conventional lithium batteries with flammable liquid electrolytes because of their advantages in safety, lifetime, and energy densities. However, the SSBs exhibit large lithium-ion (Li + ) transfer resistance at the electrode/solid-electrolyte interfaces. Here we use in-situ electron holography (EH) to visually evaluate the Li + movement around the interface that has low interfacial resistance (100 Ωcm 2 ). A prepared SSB sample possesses the negative-electrode grown from the parent solid electrolyte by partial Li + insertion Reaction into the electrolyte. EH clearly show how the negative electrode material is formed inside the solid electrolyte during the initial charging process of the SSB. Also, EH produces the presence of smooth potential distribution at the negative-electrode/solid-electrolyte interface. Furthermore, EH reveals a subtle potential-change in the solid electrolyte, showing where the Li + movement is disturbed during the charge–Discharge Reaction.
-
Direct observation of lithium-ion movement around an in-situ-formed-negative-electrode/solid-state-electrolyte interface during initial charge–Discharge Reaction
Electrochemistry Communications, 2012Co-Authors: Kazuo Yamamoto, Toru Asaka, Tsukasa Hirayama, Hideki Fujita, Katsumasa Nonaka, Kouji Miyahara, Yuji Sugita, Yasutoshi Iriyama, Zempachi OgumiAbstract:Abstract Solid-state lithium batteries (SSBs) are highly likely to replace conventional lithium batteries with flammable liquid electrolytes because of their advantages in safety, lifetime, and energy densities. However, the SSBs exhibit large lithium-ion (Li+) transfer resistance at the electrode/solid-electrolyte interfaces. Here we use in-situ electron holography (EH) to visually evaluate the Li+ movement around the interface that has low interfacial resistance (100 Ωcm2). A prepared SSB sample possesses the negative-electrode grown from the parent solid electrolyte by partial Li+ insertion Reaction into the electrolyte. EH clearly show how the negative electrode material is formed inside the solid electrolyte during the initial charging process of the SSB. Also, EH produces the presence of smooth potential distribution at the negative-electrode/solid-electrolyte interface. Furthermore, EH reveals a subtle potential-change in the solid electrolyte, showing where the Li+ movement is disturbed during the charge–Discharge Reaction.
Kazuo Yamamoto - One of the best experts on this subject based on the ideXlab platform.
-
direct observation of lithium ion movement around an in situ formed negative electrode solid state electrolyte interface during initial charge Discharge Reaction
Electrochemistry Communications, 2012Co-Authors: Kazuo Yamamoto, Toru Asaka, Tsukasa Hirayama, Hideki Fujita, Katsumasa Nonaka, Kouji Miyahara, Yuji Sugita, Yasutoshi Iriyama, Zempachi OgumiAbstract:Abstract Solid-state lithium batteries (SSBs) are highly likely to replace conventional lithium batteries with flammable liquid electrolytes because of their advantages in safety, lifetime, and energy densities. However, the SSBs exhibit large lithium-ion (Li + ) transfer resistance at the electrode/solid-electrolyte interfaces. Here we use in-situ electron holography (EH) to visually evaluate the Li + movement around the interface that has low interfacial resistance (100 Ωcm 2 ). A prepared SSB sample possesses the negative-electrode grown from the parent solid electrolyte by partial Li + insertion Reaction into the electrolyte. EH clearly show how the negative electrode material is formed inside the solid electrolyte during the initial charging process of the SSB. Also, EH produces the presence of smooth potential distribution at the negative-electrode/solid-electrolyte interface. Furthermore, EH reveals a subtle potential-change in the solid electrolyte, showing where the Li + movement is disturbed during the charge–Discharge Reaction.
-
Direct observation of lithium-ion movement around an in-situ-formed-negative-electrode/solid-state-electrolyte interface during initial charge–Discharge Reaction
Electrochemistry Communications, 2012Co-Authors: Kazuo Yamamoto, Toru Asaka, Tsukasa Hirayama, Hideki Fujita, Katsumasa Nonaka, Kouji Miyahara, Yuji Sugita, Yasutoshi Iriyama, Zempachi OgumiAbstract:Abstract Solid-state lithium batteries (SSBs) are highly likely to replace conventional lithium batteries with flammable liquid electrolytes because of their advantages in safety, lifetime, and energy densities. However, the SSBs exhibit large lithium-ion (Li+) transfer resistance at the electrode/solid-electrolyte interfaces. Here we use in-situ electron holography (EH) to visually evaluate the Li+ movement around the interface that has low interfacial resistance (100 Ωcm2). A prepared SSB sample possesses the negative-electrode grown from the parent solid electrolyte by partial Li+ insertion Reaction into the electrolyte. EH clearly show how the negative electrode material is formed inside the solid electrolyte during the initial charging process of the SSB. Also, EH produces the presence of smooth potential distribution at the negative-electrode/solid-electrolyte interface. Furthermore, EH reveals a subtle potential-change in the solid electrolyte, showing where the Li+ movement is disturbed during the charge–Discharge Reaction.
Toru Asaka - One of the best experts on this subject based on the ideXlab platform.
-
direct observation of lithium ion movement around an in situ formed negative electrode solid state electrolyte interface during initial charge Discharge Reaction
Electrochemistry Communications, 2012Co-Authors: Kazuo Yamamoto, Toru Asaka, Tsukasa Hirayama, Hideki Fujita, Katsumasa Nonaka, Kouji Miyahara, Yuji Sugita, Yasutoshi Iriyama, Zempachi OgumiAbstract:Abstract Solid-state lithium batteries (SSBs) are highly likely to replace conventional lithium batteries with flammable liquid electrolytes because of their advantages in safety, lifetime, and energy densities. However, the SSBs exhibit large lithium-ion (Li + ) transfer resistance at the electrode/solid-electrolyte interfaces. Here we use in-situ electron holography (EH) to visually evaluate the Li + movement around the interface that has low interfacial resistance (100 Ωcm 2 ). A prepared SSB sample possesses the negative-electrode grown from the parent solid electrolyte by partial Li + insertion Reaction into the electrolyte. EH clearly show how the negative electrode material is formed inside the solid electrolyte during the initial charging process of the SSB. Also, EH produces the presence of smooth potential distribution at the negative-electrode/solid-electrolyte interface. Furthermore, EH reveals a subtle potential-change in the solid electrolyte, showing where the Li + movement is disturbed during the charge–Discharge Reaction.
-
Direct observation of lithium-ion movement around an in-situ-formed-negative-electrode/solid-state-electrolyte interface during initial charge–Discharge Reaction
Electrochemistry Communications, 2012Co-Authors: Kazuo Yamamoto, Toru Asaka, Tsukasa Hirayama, Hideki Fujita, Katsumasa Nonaka, Kouji Miyahara, Yuji Sugita, Yasutoshi Iriyama, Zempachi OgumiAbstract:Abstract Solid-state lithium batteries (SSBs) are highly likely to replace conventional lithium batteries with flammable liquid electrolytes because of their advantages in safety, lifetime, and energy densities. However, the SSBs exhibit large lithium-ion (Li+) transfer resistance at the electrode/solid-electrolyte interfaces. Here we use in-situ electron holography (EH) to visually evaluate the Li+ movement around the interface that has low interfacial resistance (100 Ωcm2). A prepared SSB sample possesses the negative-electrode grown from the parent solid electrolyte by partial Li+ insertion Reaction into the electrolyte. EH clearly show how the negative electrode material is formed inside the solid electrolyte during the initial charging process of the SSB. Also, EH produces the presence of smooth potential distribution at the negative-electrode/solid-electrolyte interface. Furthermore, EH reveals a subtle potential-change in the solid electrolyte, showing where the Li+ movement is disturbed during the charge–Discharge Reaction.
Yasutoshi Iriyama - One of the best experts on this subject based on the ideXlab platform.
-
direct observation of lithium ion movement around an in situ formed negative electrode solid state electrolyte interface during initial charge Discharge Reaction
Electrochemistry Communications, 2012Co-Authors: Kazuo Yamamoto, Toru Asaka, Tsukasa Hirayama, Hideki Fujita, Katsumasa Nonaka, Kouji Miyahara, Yuji Sugita, Yasutoshi Iriyama, Zempachi OgumiAbstract:Abstract Solid-state lithium batteries (SSBs) are highly likely to replace conventional lithium batteries with flammable liquid electrolytes because of their advantages in safety, lifetime, and energy densities. However, the SSBs exhibit large lithium-ion (Li + ) transfer resistance at the electrode/solid-electrolyte interfaces. Here we use in-situ electron holography (EH) to visually evaluate the Li + movement around the interface that has low interfacial resistance (100 Ωcm 2 ). A prepared SSB sample possesses the negative-electrode grown from the parent solid electrolyte by partial Li + insertion Reaction into the electrolyte. EH clearly show how the negative electrode material is formed inside the solid electrolyte during the initial charging process of the SSB. Also, EH produces the presence of smooth potential distribution at the negative-electrode/solid-electrolyte interface. Furthermore, EH reveals a subtle potential-change in the solid electrolyte, showing where the Li + movement is disturbed during the charge–Discharge Reaction.
-
Direct observation of lithium-ion movement around an in-situ-formed-negative-electrode/solid-state-electrolyte interface during initial charge–Discharge Reaction
Electrochemistry Communications, 2012Co-Authors: Kazuo Yamamoto, Toru Asaka, Tsukasa Hirayama, Hideki Fujita, Katsumasa Nonaka, Kouji Miyahara, Yuji Sugita, Yasutoshi Iriyama, Zempachi OgumiAbstract:Abstract Solid-state lithium batteries (SSBs) are highly likely to replace conventional lithium batteries with flammable liquid electrolytes because of their advantages in safety, lifetime, and energy densities. However, the SSBs exhibit large lithium-ion (Li+) transfer resistance at the electrode/solid-electrolyte interfaces. Here we use in-situ electron holography (EH) to visually evaluate the Li+ movement around the interface that has low interfacial resistance (100 Ωcm2). A prepared SSB sample possesses the negative-electrode grown from the parent solid electrolyte by partial Li+ insertion Reaction into the electrolyte. EH clearly show how the negative electrode material is formed inside the solid electrolyte during the initial charging process of the SSB. Also, EH produces the presence of smooth potential distribution at the negative-electrode/solid-electrolyte interface. Furthermore, EH reveals a subtle potential-change in the solid electrolyte, showing where the Li+ movement is disturbed during the charge–Discharge Reaction.
Yuji Sugita - One of the best experts on this subject based on the ideXlab platform.
-
direct observation of lithium ion movement around an in situ formed negative electrode solid state electrolyte interface during initial charge Discharge Reaction
Electrochemistry Communications, 2012Co-Authors: Kazuo Yamamoto, Toru Asaka, Tsukasa Hirayama, Hideki Fujita, Katsumasa Nonaka, Kouji Miyahara, Yuji Sugita, Yasutoshi Iriyama, Zempachi OgumiAbstract:Abstract Solid-state lithium batteries (SSBs) are highly likely to replace conventional lithium batteries with flammable liquid electrolytes because of their advantages in safety, lifetime, and energy densities. However, the SSBs exhibit large lithium-ion (Li + ) transfer resistance at the electrode/solid-electrolyte interfaces. Here we use in-situ electron holography (EH) to visually evaluate the Li + movement around the interface that has low interfacial resistance (100 Ωcm 2 ). A prepared SSB sample possesses the negative-electrode grown from the parent solid electrolyte by partial Li + insertion Reaction into the electrolyte. EH clearly show how the negative electrode material is formed inside the solid electrolyte during the initial charging process of the SSB. Also, EH produces the presence of smooth potential distribution at the negative-electrode/solid-electrolyte interface. Furthermore, EH reveals a subtle potential-change in the solid electrolyte, showing where the Li + movement is disturbed during the charge–Discharge Reaction.
-
Direct observation of lithium-ion movement around an in-situ-formed-negative-electrode/solid-state-electrolyte interface during initial charge–Discharge Reaction
Electrochemistry Communications, 2012Co-Authors: Kazuo Yamamoto, Toru Asaka, Tsukasa Hirayama, Hideki Fujita, Katsumasa Nonaka, Kouji Miyahara, Yuji Sugita, Yasutoshi Iriyama, Zempachi OgumiAbstract:Abstract Solid-state lithium batteries (SSBs) are highly likely to replace conventional lithium batteries with flammable liquid electrolytes because of their advantages in safety, lifetime, and energy densities. However, the SSBs exhibit large lithium-ion (Li+) transfer resistance at the electrode/solid-electrolyte interfaces. Here we use in-situ electron holography (EH) to visually evaluate the Li+ movement around the interface that has low interfacial resistance (100 Ωcm2). A prepared SSB sample possesses the negative-electrode grown from the parent solid electrolyte by partial Li+ insertion Reaction into the electrolyte. EH clearly show how the negative electrode material is formed inside the solid electrolyte during the initial charging process of the SSB. Also, EH produces the presence of smooth potential distribution at the negative-electrode/solid-electrolyte interface. Furthermore, EH reveals a subtle potential-change in the solid electrolyte, showing where the Li+ movement is disturbed during the charge–Discharge Reaction.