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Yuichiro Yamakawa

Bio: Yuichiro Yamakawa is an academic researcher from Tokyo Institute of Technology. The author has contributed to research in topics: Lithium & Electrolyte. The author has an hindex of 1, co-authored 2 publications receiving 2565 citations.

Papers
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TL;DR: A lithium superionic conductor, Li(10)GeP(2)S(12) that has a new three-dimensional framework structure that exhibits an extremely high lithium ionic conductivity of 12 mS cm(-1) at room temperature, which represents the highest conductivity achieved in a solid electrolyte, exceeding even those of liquid organic electrolytes.
Abstract: Batteries are a key technology in modern society. They are used to power electric and hybrid electric vehicles and to store wind and solar energy in smart grids. Electrochemical devices with high energy and power densities can currently be powered only by batteries with organic liquid electrolytes. However, such batteries require relatively stringent safety precautions, making large-scale systems very complicated and expensive. The application of solid electrolytes is currently limited because they attain practically useful conductivities (10(-2) S cm(-1)) only at 50-80 °C, which is one order of magnitude lower than those of organic liquid electrolytes. Here, we report a lithium superionic conductor, Li(10)GeP(2)S(12) that has a new three-dimensional framework structure. It exhibits an extremely high lithium ionic conductivity of 12 mS cm(-1) at room temperature. This represents the highest conductivity achieved in a solid electrolyte, exceeding even those of liquid organic electrolytes. This new solid-state battery electrolyte has many advantages in terms of device fabrication (facile shaping, patterning and integration), stability (non-volatile), safety (non-explosive) and excellent electrochemical properties (high conductivity and wide potential window).

3,372 citations

27 May 2010
TL;DR: In this paper, the reaction mechanism of the composite processes of the sulfide solid electrolyte (SE) and lithium-sulfur all-solid-state cell was investigated and a new sulfur composite electrode using meso-porous carbon was proposed.
Abstract: Introduction Sulfur as lithium battery electrodes has high theoretical capacity of 1672 mAh·g with the electrochemical reaction in the following formula: S + 2Li +2e ↔ Li2S. However, low electronic conductivity of sulfur ca. 10 S·cm at room temperature and a loss of active material in liquid electrolytes cause low active utilization of electrode material and then poor rechargeability for the Li/S cells. All solid-state batteries using sulfide solid electrolyte (SE) are of great advantage than the batteries of liquid electrolytes, because solid – solid contact causes no dissolution problem and the same constituent components make the SE/electrode interface easier. However, the contact between the SE and electrode is key to reduce interfacial resistance and to obtain high current drain from the lithium-sulfur all solid-state cell. Previously, we found that a mixture of sulfur and acetylene black with a three-dimensional framework structure significantly improve the cell characteristics [1]. Moreover, all solid-state lithium batteries with a new sulfur composite electrode using meso-porous carbon showed a reversible capacity of 1000 mAh·g. In the present study, we tried to understand the reaction mechanism of the composite processes.

1 citations


Cited by
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Journal ArticleDOI
TL;DR: The notion of sustainability is introduced through discussion of the energy and environmental costs of state-of-the-art lithium-ion batteries, considering elemental abundance, toxicity, synthetic methods and scalability.
Abstract: Energy storage using batteries offers a solution to the intermittent nature of energy production from renewable sources; however, such technology must be sustainable. This Review discusses battery development from a sustainability perspective, considering the energy and environmental costs of state-of-the-art Li-ion batteries and the design of new systems beyond Li-ion. Images: batteries, car, globe: © iStock/Thinkstock.

5,271 citations

Journal ArticleDOI
TL;DR: The current understanding on Li anodes is summarized, the recent key progress in materials design and advanced characterization techniques are highlighted, and the opportunities and possible directions for future development ofLi anodes in applications are discussed.
Abstract: Lithium-ion batteries have had a profound impact on our daily life, but inherent limitations make it difficult for Li-ion chemistries to meet the growing demands for portable electronics, electric vehicles and grid-scale energy storage. Therefore, chemistries beyond Li-ion are currently being investigated and need to be made viable for commercial applications. The use of metallic Li is one of the most favoured choices for next-generation Li batteries, especially Li-S and Li-air systems. After falling into oblivion for several decades because of safety concerns, metallic Li is now ready for a revival, thanks to the development of investigative tools and nanotechnology-based solutions. In this Review, we first summarize the current understanding on Li anodes, then highlight the recent key progress in materials design and advanced characterization techniques, and finally discuss the opportunities and possible directions for future development of Li anodes in applications.

4,302 citations

Journal ArticleDOI
TL;DR: This review presents a comprehensive overview of the lithium metal anode and its dendritic lithium growth, summarizing the theoretical and experimental achievements and endeavors to realize the practical applications of lithium metal batteries.
Abstract: The lithium metal battery is strongly considered to be one of the most promising candidates for high-energy-density energy storage devices in our modern and technology-based society. However, uncontrollable lithium dendrite growth induces poor cycling efficiency and severe safety concerns, dragging lithium metal batteries out of practical applications. This review presents a comprehensive overview of the lithium metal anode and its dendritic lithium growth. First, the working principles and technical challenges of a lithium metal anode are underscored. Specific attention is paid to the mechanistic understandings and quantitative models for solid electrolyte interphase (SEI) formation, lithium dendrite nucleation, and growth. On the basis of previous theoretical understanding and analysis, recently proposed strategies to suppress dendrite growth of lithium metal anode and some other metal anodes are reviewed. A section dedicated to the potential of full-cell lithium metal batteries for practical applicatio...

3,812 citations

Journal ArticleDOI

3,654 citations

Journal ArticleDOI
TL;DR: In this article, various factors that affect the morphology and Coulombic efficiency of Li metal anodes have been analyzed, and the results obtained by modelling of Li dendrite growth have also been reviewed.
Abstract: Lithium (Li) metal is an ideal anode material for rechargeable batteries due to its extremely high theoretical specific capacity (3860 mA h g−1), low density (0.59 g cm−3) and the lowest negative electrochemical potential (−3.040 V vs. the standard hydrogen electrode). Unfortunately, uncontrollable dendritic Li growth and limited Coulombic efficiency during Li deposition/stripping inherent in these batteries have prevented their practical applications over the past 40 years. With the emergence of post-Li-ion batteries, safe and efficient operation of Li metal anodes has become an enabling technology which may determine the fate of several promising candidates for the next generation energy storage systems, including rechargeable Li–air batteries, Li–S batteries, and Li metal batteries which utilize intercalation compounds as cathodes. In this paper, various factors that affect the morphology and Coulombic efficiency of Li metal anodes have been analyzed. Technologies utilized to characterize the morphology of Li deposition and the results obtained by modelling of Li dendrite growth have also been reviewed. Finally, recent development and urgent need in this field are discussed.

3,394 citations