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<p>Flexible anodes with high lithium storage capacity are critical for wearable and bendable energy devices, but tin oxide (SnO₂) faces challenges like severe volume changes and limited electrical conductivity during cycling while multi-walled carbon nanotubes (MWCNT) moderate capacity limit this advancement. Hybrid SnO₂-MWCNT structures address these challenges by merging high-capacity oxides with conductive carbon scaffolds to boost capacity and stability. In this study, we prepared a freestanding SnO₂-MWCNT (T-MWCNT) composite paper anodes using a low-cost, water-based technique optimized for large-scale production. This process enables the SnO₂ nanoparticles to anchored on interconnected MWCNT frameworks, delivering superior thermal resilience and charge transport properties. The performance of hybrid T-MWCNT composite paper anode was subsequently evaluated in a lithium rechargeable cell. Electrochemical measurements showed 99% Coulombic efficiency over 40 cycles at 100&#xa0;mA/g and a lithium capacity of 220 mAh/g, which is 25% more than that of pristine MWCNT (177 mAh/g). The developed anode can be used in various flexible and bendable devices without further treatment. Notably, these anodes maintain performance in flexible configurations without further processing, enabling direct use in portable electronics. Additionally, the ability of the composite papers to shield against electromagnetic interference (EMI) was also investigated in X-band. The composite paper exhibited a total EMI shielding effectiveness (SE) of 49.2 dB making it highly suitable for commercial electronics applications.</p>

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Economical flexible composites from SnO₂-MWCNT: dual excellence in batteries and electromagnetic shielding

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Satish Teotia,
  • Anisha Chaudhary,
  • B Venkata Rami Reddy,
  • Avanish Pratap Singh,
  • Anchal Srivastava,
  • S. R. Dhakate,
  • Bhanu Pratap Singh

摘要

Flexible anodes with high lithium storage capacity are critical for wearable and bendable energy devices, but tin oxide (SnO₂) faces challenges like severe volume changes and limited electrical conductivity during cycling while multi-walled carbon nanotubes (MWCNT) moderate capacity limit this advancement. Hybrid SnO₂-MWCNT structures address these challenges by merging high-capacity oxides with conductive carbon scaffolds to boost capacity and stability. In this study, we prepared a freestanding SnO₂-MWCNT (T-MWCNT) composite paper anodes using a low-cost, water-based technique optimized for large-scale production. This process enables the SnO₂ nanoparticles to anchored on interconnected MWCNT frameworks, delivering superior thermal resilience and charge transport properties. The performance of hybrid T-MWCNT composite paper anode was subsequently evaluated in a lithium rechargeable cell. Electrochemical measurements showed 99% Coulombic efficiency over 40 cycles at 100 mA/g and a lithium capacity of 220 mAh/g, which is 25% more than that of pristine MWCNT (177 mAh/g). The developed anode can be used in various flexible and bendable devices without further treatment. Notably, these anodes maintain performance in flexible configurations without further processing, enabling direct use in portable electronics. Additionally, the ability of the composite papers to shield against electromagnetic interference (EMI) was also investigated in X-band. The composite paper exhibited a total EMI shielding effectiveness (SE) of 49.2 dB making it highly suitable for commercial electronics applications.