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<p>SnO<sub>2</sub> is regarded as a promising lithium storage material due to the advantage of sequential conversion-alloying reaction mechanism. Unfortunately, large volume expansion and undesirable reaction reversibility are identified as two fatal drawbacks. Herein, SnO<sub>2</sub> nanoparticles encapsulated in graphene oxide-coated porous biochar skeleton (SnO<sub>2</sub>/PB@GO) are skillfully constructed via an efficient one-step hydrothermal process to be employed as composite anode materials, in which the PB skeleton extracted from waste tea-seed shells possesses enough space to buffer drastic volume variation and the GO coating acts as robust physical matrix to prevent structural degradation. Moreover, double-carbon components successfully anchor SnO<sub>2</sub> nanoparticles to promote contact and reaction between Sn and Li<sub>2</sub>O to guarantee high reaction reversibility and structural integration of SnO<sub>2</sub>/PB@GO electrode. As expected, SnO<sub>2</sub>/PB@GO-based cell achieves high reversible specific capacity of 783.5&#xa0;mAh·g<sup>−1</sup> after 100 cycles at 0.1&#xa0;A·g<sup>−1</sup> and delivers desirable cycling stability with capacity retention ratio of 81.62% after 300 cycles at 1.0&#xa0;A·g<sup>−1</sup>. Therefore, this work may provide new perspectives on the modification of conversion or alloying type anodes for lithium-ion batteries and present a feasible strategy to take full advantage of the waste biomass.</p> Graphical abstract <p></p>

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Robust graphene oxide-coated porous biochar skeleton constructed on SnO2 nanoparticles as high-performance composite anode for lithium-ion batteries

  • 期刊论文

  • 发表日期：

    2025年3月18日

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  • Shu-Qing Nie,
  • Chang Miao,
  • Guo-Cheng Li,
  • Yu Xin,
  • Wei Xiao

摘要

SnO2 is regarded as a promising lithium storage material due to the advantage of sequential conversion-alloying reaction mechanism. Unfortunately, large volume expansion and undesirable reaction reversibility are identified as two fatal drawbacks. Herein, SnO2 nanoparticles encapsulated in graphene oxide-coated porous biochar skeleton (SnO2/PB@GO) are skillfully constructed via an efficient one-step hydrothermal process to be employed as composite anode materials, in which the PB skeleton extracted from waste tea-seed shells possesses enough space to buffer drastic volume variation and the GO coating acts as robust physical matrix to prevent structural degradation. Moreover, double-carbon components successfully anchor SnO2 nanoparticles to promote contact and reaction between Sn and Li2O to guarantee high reaction reversibility and structural integration of SnO2/PB@GO electrode. As expected, SnO2/PB@GO-based cell achieves high reversible specific capacity of 783.5 mAh·g−1 after 100 cycles at 0.1 A·g−1 and delivers desirable cycling stability with capacity retention ratio of 81.62% after 300 cycles at 1.0 A·g−1. Therefore, this work may provide new perspectives on the modification of conversion or alloying type anodes for lithium-ion batteries and present a feasible strategy to take full advantage of the waste biomass.

Graphical abstract