Chessboard-Like Silicon/Graphite Anodes with High Cycling Stability toward Practical Lithium-Ion Batteries

Chen, Mengxun; Cao, Wenpeng; Wang, Lichang; Ma, Xin; Han, Kai

doi:10.1021/acsaem.0c02621

Cited by 34 publications

(17 citation statements)

References 45 publications

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“…The higher ICE of the Si/AG28 than that of the pure Si anode is attributed to the role of graphite as a buffer structure near SiMPs to suppress the initial death of pulverized SiMPs. Given the comprehensive effects of pGN and graphite buffer structure, it should be noted that the initial high capacity and Coulombic efficiency of Si@pGN/AG28 anodes with a large proportion of SiMPs (20 wt %) were competitive to those of recently reported Si/graphite composite anodes (Figure b). − …”

Section: Resultsmentioning

confidence: 82%

Stress-Relief Network in Silicon Microparticles and Composite Anodes for Durable High-Energy-Density Batteries

Song

Kwak

Hwang

et al. 2021

ACS Appl. Energy Mater.

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Silicon microparticles (SiMPs), which have a high capacity, a high initial Coulombic efficiency, and a low volume-to-surface ratio compared with nanosized materials, are promising anode materials for high-energy-density battery applications. However, SiMPs suffer from inevitable particle pulverization and electrode failure at the early cycle. In this study, we suggest the construction of a porous, stress-relief carbon network on the surface of each SiMP to alleviate particle degradation at the electrode level through a template-free co-reaction of thermal polymer pyrolysis and graphitization. The designed porous graphitic carbon network (pGN) structure features not only considerable electrical conductivity and expansion tolerance but also sturdy SiMP interconnection during cycling. This enables SiMPs to improve battery performance and achieve high Coulombic efficiency and a stable cycle life in fast-charging systems without particle dissipation. Moreover, the composite anode comprising a practical level of commercial graphite and SiMP contents with pGN operates effectively because of high cycle efficiency and structural integrity, which promises the realization of advanced battery applications.

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Section: Resultsmentioning

confidence: 82%

Stress-Relief Network in Silicon Microparticles and Composite Anodes for Durable High-Energy-Density Batteries

Song

Kwak

Hwang

et al. 2021

ACS Appl. Energy Mater.

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“…g) The Statistics on performance comparison between our SiÀ G microsphere and the other silicon-graphite composites in the past 15 months (2021-01-01-2022-03-01). [26][27][28][29][30][31][32][33][34][35][36][37] the spheroidal morphology even while suffering long-term cycling. The interconnected graphite nanosheets not only provides a highly conductive framework, but also has a strong mechanical strength for expansion of silicon nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

“…f) Rate capability of commercial Si, SiÀ G nanosheet, SiÀ G microsphere anodes at the current density varied from 0.1 A g À 1 to 4.0 A g À 1 . g) The Statistics on performance comparison between our SiÀ G microsphere and the other silicon-graphite composites in the past 15 months (2021-01-01-2022-03-01) [26][27][28][29][30][31][32][33][34][35][36][37].…”

mentioning

confidence: 99%

Scalable Fabrication of Silicon‐Graphite Microsphere by Mechanical Processing for Lithium‐Ion Battery Anode with Large Capacity and High Cycling Stability

Shen

Zheng²,

et al. 2022

Batteries & Supercaps

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In order to combine the high stability of graphite and the large theoretical capacity of silicon, silicon-graphite composites attract tremendous attentions. However, the cycling stability is still a bottleneck hindering their commercialization due to the large volume expansion and poor interface compatibility. In this study, the bead grinding method is used to break micro-sized silicon and graphite particles by strong shear force simultaneously, inducing the solid-solid interface reaction between fresh silicon nanoparticles and graphite nanosheets. Subsequently, an evaporation induced self-assembly happens in spray drying process, allow for scalable synthesis of Si-graphite microsphere. The silicon-graphite microsphere (SiÀ G microsphere) delivers an excellent cycling performance, with a reversible capacity of 1895 mAh g À 1 at a current density of 0.5 A g À 1 over 500 cycles and a capacity retention of 99.8 %. Moreover, the pouch-type full battery of SiÀ G microsphere/ graphite j j LiNi 0.5 Co 0.2 Mn 0.3 O 2 exhibits remarkable cycling stability with the capacity retention of 79.3 % after 800 cycles. The manufacture process using commercial raw materials and simple mechanical strategy demonstrates great potential for the low-cost and scaled synthesis of high-performance silicongraphite anodes.

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“…Lithium‐ion batteries (LIBs) have been widely applied in consumer electronics and electric vehicles because of their advantages of high energy density and long cycling life. [ 1–6 ] In recent decades, considerable efforts have been devoted to materials development to improve its electrochemical performance; however, the safety issue remains a major challenge in the pursuit of commercial applications. [ 7–10 ] These insecurity factors mainly originate from thermal runaway, which can be triggered by the internal short circuit, overcharge, and chemical crosstalk.…”

Section: Introductionmentioning

confidence: 99%

Natural Halloysite Nanotubes Coated Commercial Paper or Waste Newspaper as Highly‐Thermal‐Stable Separator for Lithium‐Ion Batteries

Huang

Jiang

et al. 2022

Adv Materials Technologies

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Commercial polypropylene (PP) and polyethylene (PE) films are widely used as separators for lithium‐ion batteries (LIBs). However, owing to the poor thermal stability of PP and PE films, current LIBs suffer from serious safety risks in their practical applications. As an effective path, the design of novel high‐safety composite separators can significantly overcome the safety issues of LIBs. Herein, a universal and cost‐effective strategy is developed to fabricate highly‐thermal‐stable separators via coating natural halloysite nanotubes (HNTs) on both sides of commercial papers or waste newspaper. The resulted separators show superior properties, including thermal stability, heat conduction, wettability, and electrolyte uptake. Compared with commercial PP separators, both HNTs coated A4 paper and waste newspaper composite separators enable better cycling and rate performance for Li/LiFePO4 cells. Even after burning in fire or treating under 180 °C, the composite separators still present a normal structure, and the assembled cell can perform as regular. Furthermore, the nail penetration test of pouch cells illustrates that such separator significantly prevents thermal runaway of LIBs. The inexpensive and environmentally friendly materials with a facile coating process provide a highly‐thermal‐stable separator for commercial LIBs.

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Chessboard-Like Silicon/Graphite Anodes with High Cycling Stability toward Practical Lithium-Ion Batteries

Cited by 34 publications

References 45 publications

Stress-Relief Network in Silicon Microparticles and Composite Anodes for Durable High-Energy-Density Batteries

Stress-Relief Network in Silicon Microparticles and Composite Anodes for Durable High-Energy-Density Batteries

Scalable Fabrication of Silicon‐Graphite Microsphere by Mechanical Processing for Lithium‐Ion Battery Anode with Large Capacity and High Cycling Stability

Natural Halloysite Nanotubes Coated Commercial Paper or Waste Newspaper as Highly‐Thermal‐Stable Separator for Lithium‐Ion Batteries

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