Conductive Polymer-Coated Red Phosphorus Encapsulated in 3d Graphene Oxide Aerogel for High-Performance Sodium-Ion Batteries Anode

Abstract

Relying on the high theoretical capacity for sodium storage, red phosphorus (RP) has attracted tremendous attention. However, its utilization is confronted with numerous limitations, such as substantial volume expansion and inferior conductivity. Herein, a RP anode (P/PPy@rGO) coated by conductive polypyrrole (PPy) was encapsulated in a spatially self-assembled reduced graphene oxide (rGO) aerogel by electrostatic interaction. The coating of PPy can not only enhance the conductivity of RP effectively, but also facilitate the connection between RP and rGO. Moreover, the rGO aerogel can accommodate the volume expansion of RP. Benefited from this unique structure, the P/PPy@rGO electrode can exhibit an enhanced rate performance (619 mAh gcomposite-1 at 5.2A g-1) and excellent cycling stability with a capacity retention of 89.5% after 100 cycles. This work would contribute to the suitable design of phosphorus-based anode for sodium storage.

Keywords: Sodium-ion batteries, Red phosphorus；anode materials； Conductive polymer；reduced graphene oxide aerogel