Journal
JOURNAL OF ELECTROCERAMICS
Volume 17, Issue 2-4, Pages 657-660Publisher
SPRINGER
DOI: 10.1007/s10832-006-8975-4
Keywords
lithium ion battery; aqueous processing; natural graphite; swelling behavior; stability
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The effect of carboxymethyl cellulose (CMC) swelling on the stability and chemical properties of a natural graphite suspension in an aqueous medium was investigated. Suspensions prepared at different pH were characterized according to swelling behavior, rheology, green microstructural observation, and measurement of the pore size. A correlation was found between dispersion stability and electrochemical performance. It was found that the swelling of CMC was a critical factor influencing the stability of graphite suspensions. This was evidenced by observations of the green microstructures and changes noted in sedimentation behaviors. Electrochemical experiments using a Li/organic electrolyte/natural graphite anode half-cell and 750 mAh-class lithium ion cells exhibited an initial discharge capacity above 340 mAh g(-1) and an improved charge-discharge efficiency.
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