Kompositonan di Grafit di Bateria Li-Ion

(Kompositonan di Grafit di Bateria Li-Ion)

Grafit ta un di e materialnan aktivo mas importante den bateria di Li ion i ta wòrdu usá ampliamente komo e elektroda negativo. E ta sumamente versátil i ta ofresé un kantidat di bentaha, inkluyendo stabilidat di kargamentu ekselente, densidat di energia adekuá i densidat di energia haltu.

Apesar di esfuersonan di investigashon ekstenso pa haña alternativanan adekuá ku densidatnan di poder i/òf energia mehorá, grafiet ta keda un pilar den baterianan komersial di Li ion ku ta disponibel aktualmente. Grafit tambe ta ofresé un siklabilidat ekselente ya ku e por apsorbé i warda ionnan di litio.

Pero, grafiet no ta e úniko material aktivo den bateria di litio-ion, i e merkado pa LiBs ta sigui krese na un ritmo rápido. Esaki ta debí na e aparishon di vehíkulonan eléktriko, plug in vehicles and hybrid electric vehicles, which are rapidly becoming large markets.

For these new applications, graphite-containing composites have been developed. They can be either a pure graphite-based anode, or they can be a combination of a high-capacity compound (p.e., understoichiometric silicon oxide or a silicon-metal alloy) and graphite.

These combinations have been shown to provide a considerable increase in the first cycle coulombic efficiency compared to standard graphite-based electrodes. Ademas, the energy density is further increased when the composite electrode is pre-lithiated. This has been achieved, for instance, by preparing a pre-lithiated composite electrode consisting of SiOx/graphite and NCA with an areal capacity above 600 mA h cm-2, with an ICE of 86% despues 150 siklonan.

Pero, further improvement of the energy density is required for a successful commercial rollout. Besides the above-mentioned ex situ modifications of the graphite surface, a significant impact can be achieved by tailoring the electrolyte composition. Tipikamente, this is done by adding additives to the EC.

(Kompositonan di Grafit di Bateria Li-Ion)