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Carbon Nanotube-Reinforced Binder-Free Sn/SnO2/Cu3Sn Composite Materials for High-Capacity Lithium-Ion Battery Anodes
Guanzheng Wang1, Xiaoli Zhan1, Zhong Liu1
1Faculty of Material Science and Engineering, Yunnan Key Laboratory of Integrated Computational Materials Engineering for Advanced Light Alloys, Kunming University of Science and Technology, Kunming 650093, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|February 17, 2026
Summary
Researchers developed a new tin-based anode material for lithium-ion batteries. This composite anode demonstrates enhanced stability and capacity, overcoming issues with volume changes during cycling for improved battery performance.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Tin (Sn)-based anodes are attractive for lithium-ion batteries (LIBs) due to their abundance, low cost, high theoretical capacity, and suitable working voltages.
- However, significant volume changes during lithium-ion insertion/deinsertion cause particle pulverization, hindering commercial application.
Purpose of the Study:
- To synthesize a novel Sn/SnO2/Cu3Sn/CNTs composite anode material with a three-dimensional (3D) conductive network.
- To evaluate its electrochemical performance as an anode in LIBs, focusing on capacity retention and cycling stability.
Main Methods:
- Electrodeposition of Sn/SnO2/Cu3Sn/CNTs composite on a copper (Cu) current collector.
- Electrochemical testing of the synthesized anode material in LIBs, including cycling performance and Li+ diffusion coefficient measurements.
Main Results:
- The Sn/SnO2/Cu3Sn/CNTs anode exhibited superior reversible specific capacity (779 mAh/g after 200 cycles) compared to the Sn/SnO2/Cu3Sn anode (367 mAh/g after 100 cycles).
- The composite anode maintained a capacity of 553 mAh/g after 500 cycles at 1C, demonstrating excellent long-term stability.
- The Li+ diffusion coefficient was significantly enhanced (2.82 × 10^-12 cm2/s) due to the CNTs conductive network, which mitigates volume expansion stress and improves conductivity.
Conclusions:
- The developed 3D Sn/SnO2/Cu3Sn/CNTs composite anode effectively addresses the volume expansion issue in tin-based anodes.
- The incorporation of CNTs enhances electronic conductivity and reduces Li+ diffusion resistance, leading to improved cycling stability and high power density.
- This study presents a promising strategy for designing advanced anode materials for high-performance lithium-ion batteries.
