Carbon-coated graphite for anode of lithium ion rechargeable batteries: Graphite substrates for carbon coating

Abstract Anode performance in lithium ion rechargeable batteries (LIBs) was studied on four kinds of graphite powders, including synthetic graphite. Carbon-coated synthetic graphite gave a smaller irreversible capacity of about 20 mAh g −1 and a better cyclic performance in an electrolyte solution of EC/DMC than natural graphite, though its discharge capacity of about 300 mAh g −1 is a little smaller than natural graphite. Even in a PC-containing solution as EC/PC = 3/1, carbon-coated synthetic graphite had almost the same anode performance as in the solution without PC. Carbon coating of above 5 mass% on graphite particles was found to be effective to improve the anode performance at a low temperature of −5 °C, high retention in discharge capacity of about 90% being obtained. On both natural and synthetic graphite powders, carbon coating by the amount of 3–10 mass% at a temperature of 700–1000 °C was found to be optimum for the improvement of anode performance in LIBs, to have a lower irreversible capacity and higher retention in discharge capacity at −5 °C than without carbon coating.

[1]  Chusheng Chen,et al.  Pyrolytic polyurea encapsulated natural graphite as anode material for lithium ion batteries , 2005 .

[2]  T. Tsumura,et al.  Surface modification of natural graphite particles for lithium ion batteries , 2000 .

[3]  M. Yoshio,et al.  Carbon-coated natural graphite prepared by thermal vapor decomposition process, a candidate anode material for lithium-ion battery , 2001 .

[4]  H. Lee,et al.  Characteristics of carbon-coated graphite prepared from mixture of graphite and polyvinylchloride as anode materials for lithium ion batteries , 2001 .

[5]  Kenji Fukuda,et al.  Effect of Carbon Coating on Electrochemical Performance of Treated Natural Graphite as Lithium‐Ion Battery Anode Material , 2000 .

[6]  H. Fujimoto,et al.  Reduction of the irreversible capacity of a graphite anode by the CVD process , 2001 .

[7]  T. Nakajima,et al.  Pyrocarbon-coating on powdery hard-carbon using chemical vapor infiltration and its electrochemical characteristics , 2005 .

[8]  Jai-Young Lee,et al.  Improvement on the electrochemical characteristics of graphite anodes by coating of the pyrolytic carbon using tumbling chemical vapor deposition , 2003 .

[9]  N. Imanishi,et al.  Surface-modified meso-carbon microbeads anode for dry polymer lithium-ion batteries , 2008 .

[10]  Chang Liu,et al.  Electrochemical performance of pyrolytic carbon-coated natural graphite spheres , 2006 .

[11]  Chang Liu,et al.  Poly(vinyl chloride) (PVC) Coated Idea Revisited: Influence of Carbonization Procedures on PVC-Coated Natural Graphite as Anode Materials for Lithium Ion Batteries , 2008 .