Stress-relieving defects enable ultra-stable silicon anode for Li-ion storage

Zhou, Yunzhan; Yang, Yijun; Hou, Guolin; Ding, Yi; Zhou, Bo; Chen, Shimou; Лам, Тран Дай; Yuan, Fangli; Golberg, Dmitri; Wu, Xi

doi:10.1016/j.nanoen.2020.104568

Cited by 85 publications

(64 citation statements)

References 40 publications

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“…In Figure 5a, the most obvious peak of 284.8 eV corresponds to the hydrocarbon component in the conductive and binder components, and the other three peaks attribute to CÀ O single bonds, alkoxycarbon (O=CÀ O), carbonate groups (CO 3 ), respectively. [31,32] By contrast, it can be seen that the ratio of three components have changed to difference after the adding of LiDFP, which shows a significant increasing of the CÀ O group but decreasing of the component ratio of OÀ C=O and CO 3 group. [33] The CÀ O component mainly attributes to the structure of the combination of the solvent and the groups on the silicon surface.…”

Section: Resultsmentioning

confidence: 90%

Lithium Difluorophosphate as an Effective Additive for Improving the Initial Coulombic Efficiency of a Silicon Anode

Zhu

Lao

et al. 2020

ChemElectroChem

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Silicon anodes usually endure low initial coulombic efficiency (ICE) in applications for lithium-ion batteries (LIBs), although the volume expansion and structural stability has been greatly improved under many efforts in the recent years. During the first charge and discharge, a large number of lithium ions can participate in the formation of a solid electrolyte interface (SEI) on anode surface, such as LiF, Li 2 CO 3 and many Li-based compounds, resulting in low efficiency, particularly as the nanosized silicon is widely applied to solve the volume effect. Herein, we find that the lithium difluorophosphate (LiPO 2 F 2 , LiDFP) additive shows some special properties, which greatly improve the reversible capacity in the first discharge. The silicon nanoparticles can deliver an ICE of 70.6 % with 2 wt% LiDFP in the electrolyte, which is increased by 17.7 % compared with the cell without LiDFP (ca. 52.9 %). By comparing the XPS and NMR results, it appears the LiDFP may reduce the number of lithium ions involved in the SEI reaction in the electrolyte during the first discharge, and thus the ICE can be improved.

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Section: Resultsmentioning

confidence: 90%

Lithium Difluorophosphate as an Effective Additive for Improving the Initial Coulombic Efficiency of a Silicon Anode

Zhu

Lao

et al. 2020

ChemElectroChem

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“…simulated the distribution of effective stress (von Mises stress) on a perfect or defective graphene layer after being subjected to a 400% volumetric expansion. [ 65 ] As shown in Figure 7d, stress on the surface of defective graphene is significantly smaller than on perfect graphene. This result suggests that doped graphitized carbon can effectively release stresses to tolerate large volume expansion.…”

Section: Incorporation Of Carbonmentioning

confidence: 99%

Architectural Engineering Achieves High‐Performance Alloying Anodes for Lithium and Sodium Ion Batteries

Guo

Feng

Wang

et al. 2021

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Tremendous efforts have been dedicated to the development of high‐performance electrochemical energy storage devices. The development of lithium‐ and sodium‐ion batteries (LIBs and SIBs) with high energy densities is urgently needed to meet the growing demands for portable electronic devices, electric vehicles, and large‐scale smart grids. Anode materials with high theoretical capacities that are based on alloying storage mechanisms are at the forefront of research geared towards high‐energy‐density LIBs or SIBs. However, they often suffer from severe pulverization and rapid capacity decay due to their huge volume change upon cycling. So far, a wide variety of advanced materials and electrode structures are developed to improve the long‐term cyclability of alloying‐type materials. This review provides fundamentals of anti‐pulverization and cutting‐edge concepts that aim to achieve high‐performance alloying anodes for LIBs/SIBs from the viewpoint of architectural engineering. The recent progress on the effective strategies of nanostructuring, incorporation of carbon, intermetallics design, and binder engineering is systematically summarized. After that, the relationship between architectural design and electrochemical performance as well as the related charge‐storage mechanisms is discussed. Finally, challenges and perspectives of alloying‐type anode materials for further development in LIB/SIB applications are proposed.

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“…Herein, inspired by relief valve, designed nitrogen‐doped graphite‐like layer coating on Si nanoparticles (Si@G–N) to effectively relief the volume expansion of Si spheres during lithiation. [ 98 ] Such homogenous N‐doping in each graphitic layer generates uniformly distributed porous in the G–N network and guarantees stress relief in the lithiated Si@G–N to the maximum extent possible. Therefore, when tested as anode, Si@G–N shows high ICE of 90.3%, and it is confirmed that Si@G–N has thinner and more stable SEI film than Si@G, which suggests that nitrogen doping of graphitic shell enable Si sphere superb ICE.…”

Section: Toward Practical Applicationsmentioning

confidence: 99%

Challenges and Recent Progress on Silicon‐Based Anode Materials for Next‐Generation Lithium‐Ion Batteries

et al. 2021

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The electrode materials are the most critical content for lithium‐ion batteries (LIBs) with high energy density for electric vehicles and portable electronics. Considering the high abundance, environmental friendliness, low cost, high capacity, and low operation potential of silicon‐based anode, it has been intensively studied as one of the most promising anode materials for high‐energy LIBs. However, the widespread application of silicon anode is impeded by the poor electrical conductivity, large volume variation, and unstable solid–electrolyte interfaces films. In the past decade, significant efforts have been demonstrated to tackle these major challenges toward industrial applications. Herein, the focus is on combining with advanced structure like nanostructure and composite with other materials, exploring various new polymer binders, improving electrolyte, different prelithiation strategies, and Si/graphite design to meet commercialization requirements, particularly summarized the progress on areal capacity, initial Coulombic efficiency, and cost. Finally, the guidelines and trends for practical silicon electrodes are presented based on the recent reports.

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Stress-relieving defects enable ultra-stable silicon anode for Li-ion storage

Cited by 85 publications

References 40 publications

Lithium Difluorophosphate as an Effective Additive for Improving the Initial Coulombic Efficiency of a Silicon Anode

Lithium Difluorophosphate as an Effective Additive for Improving the Initial Coulombic Efficiency of a Silicon Anode

Architectural Engineering Achieves High‐Performance Alloying Anodes for Lithium and Sodium Ion Batteries

Challenges and Recent Progress on Silicon‐Based Anode Materials for Next‐Generation Lithium‐Ion Batteries

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