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Surface preparation of natural graphite and the effect of impurities on grinding and the particle distribution
Surface preparation of natural graphite and the effect of impurities on grinding and the particle distribution
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机译:天然石墨的表面制备以及杂质对磨削和颗粒分布的影响
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摘要
The present invention relates to the physical or chemical specific purification of natural mineral graphite. This purification is preferably applied to the surface of natural graphite in order to allow the formation of a passivation film during the first electrical discharge or the insertion of lithium in the graphite when the latter is used in a lithium-ion cell. The grinding to a small size before purification allows the optimization of the distribution of the particles, resulting in a more uniform electrode. This grinding is carried out in the presence of the natural impurities of the graphite that play the role of a micro-abrasive and result in a hardness of the graphite that increases its mechanical properties.
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