Carbon-coated graphite for anode of lithium ion rechargeable batteries: Carbon coating conditions and precursors
2009; Elsevier BV; Volume: 194; Issue: 1 Linguagem: Inglês
10.1016/j.jpowsour.2009.05.040
ISSN1873-2755
AutoresHidehiko Nozaki, Katsuhide Nagaoka, Kazuhito Hoshi, Naoto Ohta, Michio Inagaki,
Tópico(s)Advanced Battery Materials and Technologies
ResumoCarbon coating of natural graphite particles was performed by mechanical mixing of natural graphite with different carbon precursors in a scale of about 100 g. Anode performance in lithium ion rechargeable batteries was studied on the resultant carbon-coated graphite. Carbon formed on graphite particles had amorphous structure and low density. By carbon coating, a decrease in irreversible capacity of the first charge/discharge cycle in an electrolyte solution of EC/PC = 3/1 was observed, without noticeable change in discharge capacity. Carbon derived from different precursors did not give any marked difference in anode performance of carbon-coated graphite. Optimum conditions for carbon coating were determined as the coating of 4–13 mass% at 700–1000 °C. The present mechanical mixing of natural graphite and carbon precursor in powder is concluded to be a simple but sufficient process to produce carbon-coated graphite for anode material in lithium ion rechargeable batteries. As carbon precursor, PVA was shown to be one of the appreciable carbon precursors.
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