| 摘要 |
<p>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.</p> |
