4.5 Article

Dual Modulated SiO Particles by Graphene Cord and Si/SiO2 Composite for High-Performance Lithium-Ion Battery Anodes

Journal

ADVANCED MATERIALS INTERFACES
Volume 9, Issue 10, Pages -

Publisher

WILEY
DOI: 10.1002/admi.202102489

Keywords

graphene cord; lithium storage; phase change of SiO; sepia-like structure; silicon monoxide

Funding

  1. National Natural Science Foundation of China (NSFC) [11874282, 11604245, 11981240429]
  2. Six Talent Peaks Project in Jiangsu Province [2019-XNY-074]
  3. Vice President Project of Industry-University-Research Cooperation in Science and Technology of Jiangsu Province [BY2020675]
  4. Young and middle-aged academic leader of Qinglan Project of universities in Jiangsu Province (2021)
  5. Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX21_3472]

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A concept of phase change mediation combined with cord reinforcing is proposed to address the fragility and poor conductivity issues of SiO-based anode materials. The in-situ fabricated graphene cord enhances the electrical conductivity and flexibility of the SiO@Gra anode, while increased SiO2 regions in the Si/SiO matrix alleviate volume change and enhance the tenacity of the SiO electrode. Additionally, grain boundaries and interfaces among the Si/SiO2/SiO regions contribute to additional Li+ storage and improve electrolyte wetting, leading to superior electrochemical performance of the SiO anodes.
To dispose the fragility and poor conductivity problems of SiO-based anode materials, a phase change mediation combined with cord reinforcing concept is proposed, in which graphene cord is in situ fabricated combined with Si and SiO2 nanodomains generated in the SiO matrix via chemical vapor deposition. Being the fabricated composite, graphene cord not only bridges but also wraps the SiO particles, improving the electrical conductivity and flexibility of the fabricated SiO@Gra anode. Moreover, the increased SiO2 regions in the Si/SiO matrix alleviate volume change and release the strain for Li+ insertion, enhancing the tenacity of the SiO electrode according to the phase transformation flexibility mechanism. Besides, the grain boundaries and interfaces among the Si/SiO2/SiO regions contribute to additional Li+ storage and pledge more channels for Li+ transfer and electrolyte wetting. The merit of Si/SiO2/SiO synergistically contributes to the ascendant electrochemical performance of the SiO anodes. The as-fabricated SiO@Gra anodes deliver a high reversible capacity of 1127 mAh g(-1) at 0.2 A g(-1) with 87% capacity retention after 200 cycles. The proposed phase change and cord reinforcing not only deepen the understanding of the electrochemical reaction mechanism of Li+ in SiO, but also inspire a rational design tactic for advanced lithium-ions batteries.

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