Affiliation:
1. College of Physics and Energy Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research Center Fujian Normal University Fuzhou 350117 China
2. Faculty of Metallurgical and Energy Engineering/State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and Technology Kunming 650093 China
3. Fujian Provincial Collaborative Innovation Center for Advanced High‐Field Superconducting Materials and Engineering Fuzhou 350117 China
4. Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials Fuzhou 350117 China
Abstract
AbstractTo effectively solve the challenges of rapid capacity decay and electrode crushing of silicon‐carbon (Si‐C) anodes, it is crucial to carefully optimize the structure of Si‐C active materials and enhance their electron/ion transport dynamic in the electrode. Herein, a unique hybrid structure microsphere of Si/C/CNTs/Cu with surface wrinkles is prepared through a simple ultrasonic atomization pyrolysis and calcination method. Low‐cost nanoscale Si waste is embedded into the pyrolysis carbon matrix, cleverly combined with the flexible electrical conductivity carbon nanotubes (CNTs) and copper (Cu) particles, enhancing both the crack resistance and transport kinetics of the entire electrode material. Remarkably, as a lithium‐ion battery anode, the fabricated Si/C/CNTs/Cu electrode exhibits stable cycling for up to 2300 cycles even at a current of 2.0 A g−1, retaining a capacity of ≈700 mAh g−1, with a retention rate of 100% compared to the cycling started at a current of 2.0 A g−1. Additionally, when paired with an NCM523 cathode, the full cell exhibits a capacity of 135 mAh g−1 after 100 cycles at 1.0 C. Therefore, this synthesis strategy provides insights into the design of long‐life, practical anode electrode materials with micro/nano‐spherical hybrid structures.