公开(公告)号：EP1257501B1

公开(公告)日：2008-07-30

申请号：EP01909376.4

申请日：2001-02-23

申请人： Hydro-Québec

发明人： ZAGHIB, Karim ,  GAUTHIER, Michel ,  NADEAU, Gabrielle ,  GHERFI, Abdelbast ,  MASS , Monique ,  BROCHU, Fernand ,  ARMAND, Michel

IPC分类号： C01B31/04 ,  H01M4/58

CPC分类号： H01M4/583 ,  C01B32/215 ,  H01M4/133 ,  H01M10/0525

公开(公告)号：EP1257501A1

公开(公告)日：2002-11-20

申请号：EP01909376.4

申请日：2001-02-23

申请人： Hydro-Québec

发明人： ZAGHIB, Karim ,  GAUTHIER, Michel ,  NADEAU, Gabrielle ,  GHERFI, Abdelbast ,  MASS , Monique ,  BROCHU, Fernand ,  ARMAND, Michel

IPC分类号： C01B31/04 ,  H01M4/58

CPC分类号： H01M4/583 ,  C01B32/215 ,  H01M4/133 ,  H01M10/0525

摘要： The invention concerns the physical or chemical purification of natural graphite ore. Said purification is preferably applied to the surface of natural graphite to enable the formation of a passivation film during the first discharge or parting of lithium in the graphite when the latter is used in a lithium-ion cell. Grinding to a small size before purification enables to optimise particle distribution, resulting in a more homogeneous electrode. Said grinding is carried out in the presence of natural graphite impurities which act as micro-abrasive and provide the graphite with hardness thereby enhancing its mechanical properties.