Charge-Discharge Behavior of Graphite in Propylene Carbonate-Containing Electrolytes Kyoto Univ

Format:

Book

Conference/Event

Author/Creator:

Yamada, Yūki, author.

Contributor:

Abe, Takeshi

Koyama, Yasuhiro

Ogumi, Zempachi

Conference Name:

1st International Electric Vehicle Technology Conference (2011-05-17 : Yokohama, Japan)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Tokyo, JAPAN Society of Automotive Engineers of Japan 2011

Summary:

The electrochemical intercalation of lithium-ion into naturalgraphite cannot take place in propylene carbonate (PC)-basedelectrolytes. Continuous decomposition of PC, accompanied by theexfoliation of graphite, is observed instead of the intercalationof lithium-ion. One of the plausible hypotheses to explain thisbehavior is that PC-solvated lithium-ion intercalates into graphiteduring the first charge, resulting in the exfoliation of graphite.Therefore, we consider that the solvation structure of lithium-ionin PC-based electrolytes should strongly influence thecharge-discharge behavior of natural graphite.We studied the charge-discharge properties of natural graphitein binary electrolytes consisting of PC and dimethyl carbonate(DMC) with various mixing ratios. The average solvation numbers ofPC molecules per lithium-ion(NPC,ave) in PC:DMC binaryelectrolytes were evaluated with Raman spectroscopy. We examinedthe correlation between the solvation number of PC molecules andthe charge-discharge behavior of natural graphite and discuss themechanism of the exfoliation of graphite

Notes:

Vendor supplied data

Publisher Number:

2011-39-7236

Access Restriction:

Restricted for use by site license