High power and stable P-doped yolk-shell structured Si@C anode simultaneously enhancing conductivity and Li+ diffusion kinetics

Chen, Ming; Zhou, Qinnan; Zai, Jiantao; Iqbal, Asma; Tsega, TsegayeTadesse; Dong, Boxu; Liu, Xuejiao; Zhang, Yuchi; Yan, Changyu; Zhao, Lang; Ali, Nazakat; SharelPeisan, E; Low, Chee Tong John; Qian, Xuefeng

doi:10.1007/s12274-020-3142-9

Cited by 64 publications

(44 citation statements)

References 66 publications

(95 reference statements)

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“…The diffusivity coefficient of Li + in the Si/LM@C-CNF anode is calculated to be ≈10 −8 cm 2 S −1 , which is among the highest values in recent studies. [42,43] In sharp contrast, the Si/SM@C-CNF and Si/LM/SP anodes had no regular step curve due to the low conductivity and large polarization (Figure S13, Supporting Information). In Figure 5c, the thick Si/LM@C-CNF anode (2.42 mg cm −2 ) delivered an initial areal capacity of ≈4.5 mAh cm −2 at 0.2 A g −1 .…”

Section: Practicability Of Si/lm@c-cnfmentioning

confidence: 99%

Liquid Metal Remedies Silicon Microparticulates Toward Highly Stable and Superior Volumetric Lithium Storage

Zhao

Han

Chen

et al. 2022

Advanced Energy Materials

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cheaper, have a lower specific surface area, producing less interfacial reaction, and a higher tap density. [3][4][5] These features make a SiMP anode favorable for building compact LIBs with higher volumetric energy density to solve the "space anxiety" in consumer electronics and electric vehicles. When Si anodes store lithium ions through a two-phase (Si core and Li x Si shell) alloying mechanism, the huge strain mismatch (large tension in the Li x Si shell and compression in the Si core) inevitably initiates particle cracking. [6] During Li extraction, the particle shrinks with an ≈300% volume change and is finally pulverized, leading to mechanical failure, generation of irregular voids and excessive solid-electrolyte interphase (SEI) growth. [7,8] Some Si fragments lose electronic contact and become "dead" Si with trapped Li, which is fatal and results in rapid capacity deterioration. These issues are much more severe for microparticulates with large sizes and irregular shapes, making it very difficult to unlock the true potential of SiMPs as dense and thick electrodes in compact LIBs. [7,9,10] A surface coating on the SiMPs is a very promising technique to buffer the mechanical stresses and improve particle integration. A polymer coating with a self-healing ability and lithium fluoride (LiF)-rich SEI layers with a high interfacial energy with Si efficiently improve the cycling stability of SiMP anodes. [11][12][13][14] However, these insulating coatings show limited ability to electrically link the Si fragments and improve the electrochemical performance, especially at high current densities. A conductive graphitic carbon coating for SiMPs is a strong buffer for the mechanical stresses produced during volume changes and, more importantly, electrically links the Si fragments in contact with the carbon, improving the utilization of active materials. [15,16] Our group has designed a double carbon coating with a strong yet ductile outer layer derived from a shrinking graphene hydrogel network, that has an "imperfection-tolerance" to the volume changes of irregular lithiated SiMPs. [17][18][19] Efficient stress management by this double carbon encapsulation during external calendering compression and internal lithiation expansion provides a promising strategy for the practical use of SiMP anodes. Nevertheless, these surface protection strategies have not addressed the problem of the electrical disconnection of the Si fragments deep inside the protection layer that have no contact with any conducting agents (Figure 1c) after repeated A silicon microparticulate material (SiMP) used as the anode for lithium-ion batteries promises higher volumetric capacity and less interfacial reactions than its costly nanoparticulate counterpart. However, what mostly hinders its practical use is its expansion and pulverization during cycling that induces electrical disconnection and electrode polarization. A liquid metal (LM) is proposed as a remedy for these problems that acts as an adaptive conducting continuum to cure both short...

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Section: Practicability Of Si/lm@c-cnfmentioning

confidence: 99%

Liquid Metal Remedies Silicon Microparticulates Toward Highly Stable and Superior Volumetric Lithium Storage

Zhao

Han

Chen

et al. 2022

Advanced Energy Materials

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“…This unique structure can suppress pulverization of the active material, enhance the electron transferring conductivity and improve the electrochemical performance. [ 49,50 ]…”

Section: Resultsmentioning

confidence: 99%

Facile and Scalable Synthesis of Si@void@C Embedded in Interconnected 3D Porous Carbon Architecture for High Performance Lithium‐Ion Batteries

Tan

Liu

et al. 2021

Part & Part Syst Charact

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Si‐based materials possess huge potential as an excellent anode material for Li‐ion batteries. However, how to realize scalable synthesis of Si‐based anode with a long cycling life and high‐performance is still a critical challenge. Here a water‐in‐oil microemulsion process followed by UV illumination, calcination, and hydrothermal method to produce yolk‐shell Si@void@C embedded in interconnected 3D porous carbon network architecture using silicon nanoparticles is reported. As a result, the sample Si@void@C/C‐2 electrode has achieved a reversible capacity of 1160 mA h g−1 at 0.2 A g−1 after 300 cycles and a stable long cycling life of 480 mA h g−1 at 1 A g−1 after 1000 cycles. A full battery with the synthesized anode shows a capacity of 128 mA h g−1 at 0.2 A g−1 as well as good cycling stability after 1100th cycles. Such excellent electrochemical performance is ascribed to its unique structure, the yolk‐shell void space, highly robust carbon shells and interconnected porous carbon nets that can improve the conductivity of the electrode, buffer the volume expansion, and also suppress Si nanoparticles stress variation. This water‐in oil system makes it possible for mass production of environmentally friendly synthesis of core–shell structure.

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“…As illustrated in Figure 12c, doping with B greatly decreased the resistance and surface oxidation compared to those of the starting materials. [111] As a result, the obtained B-doped…”

Section: Metal/nonmetal Dopingmentioning

confidence: 86%

mentioning

confidence: 99%

A Review on Recent Advances for Boosting Initial Coulombic Efficiency of Silicon Anodic Lithium Ion batteries

Sun

Liu

et al. 2021

Small

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Rechargeable silicon anode lithium ion batteries (SLIBs) have attracted tremendous attention because of their merits, including a high theoretical capacity, low working potential, and abundant natural sources. The past decade has witnessed significant developments in terms of extending the lifespan and maintaining high capacities of SLIBs. However, the detrimental issue of low initial Coulombic efficiency (ICE) toward SLIBs is causing more and more attention in recent years because ICE value is a core index in full battery design that profoundly determines the utilization of active materials and the weight of an assembled battery. Herein, a comprehensive review is presented of recent advances in solutions for improving ICE of SLIBs. From design perspectives, the strategies for boosting ICE of silicon anodes are systematically categorized into several aspects covering structure regulation, prelithiation, interfacial design, binder design, and electrolyte additives. The merits and challenges of various approaches are highlighted and discussed in detail, which provides valuable insights into the rational design and development of state‐of‐the‐art techniques to deal with the deteriorative issue of low ICE of SLIBs. Furthermore, conclusions and future promising research prospects for lifting ICE of SLIBs are proposed at the end of the review.

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High power and stable P-doped yolk-shell structured Si@C anode simultaneously enhancing conductivity and Li+ diffusion kinetics

Cited by 64 publications

References 66 publications

Liquid Metal Remedies Silicon Microparticulates Toward Highly Stable and Superior Volumetric Lithium Storage

Liquid Metal Remedies Silicon Microparticulates Toward Highly Stable and Superior Volumetric Lithium Storage

Facile and Scalable Synthesis of Si@void@C Embedded in Interconnected 3D Porous Carbon Architecture for High Performance Lithium‐Ion Batteries

A Review on Recent Advances for Boosting Initial Coulombic Efficiency of Silicon Anodic Lithium Ion batteries

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