Core–Shell Structure of a Polypyrrole-Coated Phosphorus/Carbon Nanotube Anode for High-Performance Lithium-Ion Batteries
Jiantong Sun, Jiantong Sun, Cheng Liu, Huili Wang, Yu Cao, Xinpeng Han, Shaojie Zhang, Haipeng Wang, Yiming Zhang, Aibing Chen, Zhanxu Yang, Jie Sun, Jie Sun
Abstract
Black phosphorus is regarded as a promising anode material due to its high theoretical specific capacity and fast-charging safety compared with the commercial graphite-based anode materials. However, the practical application of a black phosphorus anode is constrained by the large volumetric variation, unstable electrode/electrolyte interface, and shuttle effect of soluble phosphorus intermediates. Herein, we fabricated a phosphorus/carbon nanotube@polypyrrole (BP/CNT@PPy) composite via a simple high-energy ball-milling (HEBM) and liquid polymerization method. When it was used as the anode material for lithium-ion batteries, the elastic and conductive PPy coating layer played an important role in buffering volume expansion, improving electrical conductivity, and maintaining the integrity of active materials. Thus, the BP/CNT@PPy electrode exhibits excellent cyclic stability. This work provides a favorable strategy to design a high-performance phosphorus anode for lithium-ion batteries.