Suitable thickness of carbon coating layers for silicon anode

Qi, Chuanlei; Li, Shengping; Yang, Zipan; Xiao, Zhihua; Zhao, Lu; Yang, Fan; Gao, Ning; Ma, Xinlong; Wang, Chengxiu; Xu, Jun; Gao, Jinsen

doi:10.1016/j.carbon.2021.10.062

Cited by 80 publications

(39 citation statements)

References 66 publications

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“… , The oxide layer on Si is expected to be derived from the original Si nanoparticles (Figure S6d, Supporting Information) as well as oxidizing environment during spray drying process. Because of the graphitized nature of carbonaceous components, a four-probe method (see details for Supporting Information) was conducted for G-Si-CNTs to obtain an electrical conductivity of 256 S cm –1 , which outperforms a majority of recently reported Si–C composites. − …”

Section: Resultsmentioning

confidence: 99%

Spheres of Graphene and Carbon Nanotubes Embedding Silicon as Mechanically Resilient Anodes for Lithium-Ion Batteries

Yin

et al. 2022

Nano Lett.

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Novel anode materials for lithium-ion batteries were synthesized by in situ growth of spheres of graphene and carbon nanotubes (CNTs) around silicon particles. These composites possess high electrical conductivity and mechanical resiliency, which can sustain the high-pressure calendering process in industrial electrode fabrication, as well as the stress induced during charging and discharging of the electrodes. The resultant electrodes exhibit outstanding cycling durability (∼90% capacity retention at 2 A g–1 after 700 cycles or a capacity fading rate of 0.014% per cycle), calendering compatibility (sustain pressure over 100 MPa), and adequate volumetric capacity (1006 mAh cm–3), providing a novel design strategy toward better silicon anode materials.

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Section: Resultsmentioning

confidence: 99%

Spheres of Graphene and Carbon Nanotubes Embedding Silicon as Mechanically Resilient Anodes for Lithium-Ion Batteries

Yin

et al. 2022

Nano Lett.

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“…This result suggests that, on one side, lower currents facilitate the kinetics of irreversible interfacial processes, whereas on the other side, the kinetics of the reversible (de)alloying process is favored at higher currents. In Table , the main characteristics of the electrodes tested in terms of mass loading, composition, rate capability performance, capacity retention at high specific currents and production of the C buffering matrix, are compared to some Si/C composites recently published. − It is worth noticing that, despite the lower performance with respect to some works present in the literature, the Si/CCDHC composite displays a higher capacity retention when going from slow to high current rates, while maintaining a higher active material mass loading and percentage in the electrode composition than many other materials considered hereby. In addition, the preparation of the CCDHC is kept as simple and sustainable as possible, thus offering promising scale-up opportunities.…”

Section: Resultsmentioning

confidence: 99%

Structural and Interfacial Characterization of a Sustainable Si/Hard Carbon Composite Anode for Lithium-Ion Batteries

Sbrascini

Staffolani

Bottoni

et al. 2022

ACS Appl. Mater. Interfaces

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The effects of a biomass-derived hard carbon matrix and a sustainable cross-linked binder are investigated as electrode components for a silicon-based anode in lithium-ion half-cells, in order to reduce the capacity fade due to volume expansion and shrinkage upon cycling. Ex situ Raman spectroscopy and impedance spectroscopy are used to deeply investigate the structural and interfacial properties of the material within a single cycle and upon cycling. An effective buffering of the volume changes of the composite electrode is evidenced, even at a high Si content up to 30% in the formulation, resulting in the retention of structural and interfacial integrity. As a result, a high capacity performance and a very good rate capability are displayed even at high current densities, with a stable cycling behavior and low polarization effects.

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“…So it delivers an ICE improvement of 11% compared to bare silicon, but the ICE of 74.34% is still not very satisfactory. It is believed that this is mainly due to the characteristics of the coating layer SiOC and the large specific surface area caused by the small particle size . Generally speaking, SiOC contains three components: free carbon, nanovoids, and ceramic phases.…”

Section: Results and Discussionmentioning

confidence: 99%

How the Si–O–Si Covalent Bond Interface Affects the Electrochemical Performance of the Silicon Anode

Guo

Zhong

et al. 2022

ACS Appl. Energy Mater.

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Nano-Si can alleviate the structural damage caused by volume expansion while ensuring high reversible lithium storage capacity. However, the abundant specific surface area and unique unbonded electronic properties at the surface of the nanoparticles make them suffer from complex surface side reactions and an agglomeration phenomenon. Here, strategies based on surface modification are developed to enhance the performance of nano-Si anodes. Through the in situ grafting of the SiOC coating, a stable and high-energy Si–O–Si covalent bond is formed between the core–shell, making the core–shell as a whole and avoiding the formation of dead silicon. In addition, it was verified by experiments and density functional theoretical calculations that the introduction of the covalent bond redistributed the electrons on the nano-Si surface, and the interface composed of electron-less silicon and electron-rich oxygen elements ensured high adsorption capacity to the electrolyte and structural stability after the introduction of lithium ions, thus ensuring efficient cycling capacity.

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Suitable thickness of carbon coating layers for silicon anode

Cited by 80 publications

References 66 publications

Spheres of Graphene and Carbon Nanotubes Embedding Silicon as Mechanically Resilient Anodes for Lithium-Ion Batteries

Spheres of Graphene and Carbon Nanotubes Embedding Silicon as Mechanically Resilient Anodes for Lithium-Ion Batteries

Structural and Interfacial Characterization of a Sustainable Si/Hard Carbon Composite Anode for Lithium-Ion Batteries

How the Si–O–Si Covalent Bond Interface Affects the Electrochemical Performance of the Silicon Anode

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