Porous carbon framework-nanoparticle composite material, metal lithium complex thereof, as well as preparation methods and application thereof

Abstract

The invention discloses a porous carbon framework-nanoparticle composite material, a metal lithium complex thereof, as well as preparation methods and application thereof. The porous carbon framework-nanoparticle composite material is prepared from a lithium-reactive metal which is distributed in pores and on the surface of a porous carbon framework or nanoparticle oxide thereof. By adopting the porous carbon framework-nanoparticle composite material, the nucleation energy of metal lithium in combination with the porous carbon framework can be lowered, or the affinity between the lithium and framework carbon is improved, and the security and / or cycling stability of a battery are enhanced.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a porous carbon skeleton-nano particle composite material, its metal lithium composite, their preparation method and application. Background technique [0002] Lithium battery is a secondary battery (rechargeable battery), which mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the opposite is true during discharge. Due to its high energy density, environmental friendliness and good cycle stability, lithium batteries have been widely used in electronic products, smart grids and other fields. However, the internal components of current electronic products are becoming m...

AI Technical Summary

Problems solved by technology

Unfortunately, the lithium metal negative electrode is prone to dendrites during the cycle, and the dendrites will pierce the battery separator and cause a short circuit to release huge heat, causing a series of safety accidents such as battery combustion and explosion.

In addition, the interface instability of metal lithium during the cycle increases the internal resistance of the battery, causing the cycle capacity of the battery to decay.

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