Covalently Integrated CNT@rGO for Superior Conductivity and Cycling Stability in Lithium-Ion Batterie

TL;DR

This paper introduces a cost-effective one-step CVD method to create covalently integrated CNT@rGO composites, significantly improving conductivity and cycling stability in lithium-ion batteries.

Contribution

A novel, scalable synthesis of CNT@rGO composites with covalent bonds, enhancing battery performance and stability over conventional conductive agents.

Findings

Achieved ultra-high yield growth of CNTs on rGO substrate.

Enhanced rate performance of LiFePO4 cathodes across 1-6C.

Demonstrated 96.32% capacity retention after 300 cycles.

Abstract

The limitations of conventional conductive agents in lithium-ion batteries, such as carbon black and graphite flakes, have driven the search for high-performance alternatives. Carbon nanotubes (CNTs) and graphene offer exceptional conductivity and lower dosage requirements, but face challenges related to high costs and complex fabrication processes. Here, we report a simple and cost-effective one-step chemical vapor deposition (CVD) method for the ultra-high yield growth (7692.31%) of CNTs on a reduced graphene oxide (rGO) substrate, forming a three-dimensional CNT@rGO composite with covalent integration. When employed as a conductive agent for lithium iron phosphate (LiFePO4) cathodes, the CNT@rGO composites significantly enhance rate performance across 1-6C rates, and demonstrate exceptional cycling stability, achieving 96.32% capacity retention after 300 cycles at 1C. The synergistic structure facilitates multiple conductive pathways, minimizes catalyst residue (0.52%), and ensures uniform dispersion, providing an effective and cost-efficient solution for next-generation battery technology. This study lays the foundation for the large-scale application of high-performance carbon conductive agents in battery technology.