Journal
SOLID STATE IONICS
Volume 323, Issue -, Pages 123-129Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2018.04.023
Keywords
All-solid-state lithium battery; Optical microscopy; Graphite; Solid electrolyte; Negative electrode; Reaction distributions
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Funding
- Japan Science and Technology Agency (JST), Advanced Low Carbon Technology Research and Development Program (ALCA) Specially Promoted Research for Innovative Next Generation Batteries (SPRING) project
- Ministry of Education, Culture, Sports, Science and Technology of Japan
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Composite graphite negative electrodes were prepared by mixing graphite particles and 75Li(2)S center dot 25P(2)S(5) (mol%) glass particles with weight ratios of x:100 - x (x = 50, 60 and 70). The cell with the x = 50 electrode showed the highest reversible capacity of more than 250 mAh g(-1). Optical microscopy was conducted for each composite electrode after electrochemical lithiation to investigate reaction distributions by color changes of graphite particles. In the x = 50 electrodes, almost all the graphite particles changed to gold color, suggesting that the graphite particles were fully lithiated. In situ optical microscopy was also carried out for the composite graphite electrode to monitor color changes of graphite particles directly during charge-discharge tests.
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