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<p>Transition metal oxides (TMOs) are promising lithium-ion battery (LIB) anode materials but suffer from poor cycling stability and sluggish charge transfer kinetics. Herein, a carbon-encapsulated amorphous CoO<sub>x</sub>/carbon-graphene (aCoO<sub>x</sub>/CG) composite was fabricated via a facile and scalable approach. Comprehensive characterisations confirm the amorphous nature of CoO<sub>x</sub> and the uniform dispersion of active components in the carbon matrix, which effectively alleviates stress concentration during the phase transition process. Electrochemical tests demonstrate that aCoO<sub>x</sub>/CG delivers exceptional lithium storage performance: it exhibits a high reversible capacity of 695 mAh g<sup>−1</sup> at 200&#xa0;mA&#xa0;g<sup>−1</sup> with 91.2% retention after 290 cycles, and ultra-long cycling stability with only 2.5% capacity decay after 1750 cycles at 1 A g<sup>−1</sup>, outperforming crystalline analogues (cCoO/CG, cCoO/G) and commercial nano-CoO. The superior performance originates from the unique synergistic effect: amorphous CoO<sub>x</sub> undergoes in situ electrochemical phase transition to uniformly distributed high-activity Co nanocrystals, enhancing structural stability and reaction reactivity; the carbon matrix mitigates volume expansion. This work provides a viable design strategy for high-performance TMO-based LIB anodes, addressing their intrinsic drawbacks.</p> Graphical abstract <p></p>

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Ultrastable amorphous CoOx-carbon composite for lithium-ion battery anodes

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Zhiming Tu,
  • Tauseef Munawar,
  • Lisha Shen,
  • Muhammad Rafaqat,
  • Zhida Wang,
  • Changfeng Yan

摘要

Transition metal oxides (TMOs) are promising lithium-ion battery (LIB) anode materials but suffer from poor cycling stability and sluggish charge transfer kinetics. Herein, a carbon-encapsulated amorphous CoOx/carbon-graphene (aCoOx/CG) composite was fabricated via a facile and scalable approach. Comprehensive characterisations confirm the amorphous nature of CoOx and the uniform dispersion of active components in the carbon matrix, which effectively alleviates stress concentration during the phase transition process. Electrochemical tests demonstrate that aCoOx/CG delivers exceptional lithium storage performance: it exhibits a high reversible capacity of 695 mAh g−1 at 200 mA g−1 with 91.2% retention after 290 cycles, and ultra-long cycling stability with only 2.5% capacity decay after 1750 cycles at 1 A g−1, outperforming crystalline analogues (cCoO/CG, cCoO/G) and commercial nano-CoO. The superior performance originates from the unique synergistic effect: amorphous CoOx undergoes in situ electrochemical phase transition to uniformly distributed high-activity Co nanocrystals, enhancing structural stability and reaction reactivity; the carbon matrix mitigates volume expansion. This work provides a viable design strategy for high-performance TMO-based LIB anodes, addressing their intrinsic drawbacks.

Graphical abstract