Formation of hierarchically ordered structures in conductive polymers to enhance the performances of lithium-ion batteries

Zhu, Tianyu; Sternlicht, Hadas; Ha, Yang; Chen, Fang; Liu, Dongye; Savitzky, Benjamin H.; Zhao, Xiao; Lu, Yanying; Fu, Yanbao; Ophus, Colin; Zhu, Chenhui; Yang, Wanli; Minor, Andrew M.; Liu, Gao

doi:10.1038/s41560-022-01176-6

Cited by 89 publications

(43 citation statements)

References 48 publications

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“…[13][14][15][16][17][18] Then, nanoengineering of silicon, such as synthesis of silicon nanowires, [19][20][21] and silicon nanotube, [22] and predesigning buffer space through core-shell nanostructure, [23,24] yolk-shell nanostructure, [25] hollow structure, [26,27] and porous structure, [28] has been extensively utilized to improve the capacity and cycling stability by avoiding pulverization and internal stress. [29][30][31][32][33] After then, the academical research interest shifted to micro-silicon with much lower cost, and plenty of effective modifications have been proposed, such as surface coating, [34] functional binder, [35][36][37][38] new electrolyte additives, [39,40] and combination with solid state electrolyte. [41] Over the past two decades, a series of the critical crack sizes of silicon active materials was proposed, [42][43][44] while the detailed physical and chemical understanding is still lacking in the size effect of silicon anode.…”

Section: Introductionmentioning

confidence: 99%

Benchmarking the Effect of Particle Size on Silicon Anode Materials for Lithium‐Ion Batteries

Dong

et al. 2023

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High‐capacity silicon has been regarded as one of the most promising anodes for high‐energy lithium‐ion batteries. However, it suffers from severe volume expansion, particle pulverization, and repeated solid electrolyte interphase (SEI) growth, which leads to rapid electrochemical failure, while the particle size also plays key role here and its effects remain elusive. In this paper, through multiple‐physical, chemical, and synchrotron‐based characterizations, the evolutions of the composition, structure, morphology, and surface chemistry of silicon anodes with the particle size ranging from 50 to 5 µm upon cycling are benchmarked, which greatly link to their electrochemical failure discrepancies. It is found that the nano‐ and micro‐silicon anodes undergo similar crystal to amorphous phase transition, but quite different composition transition upon de‐/lithiation; at the same time, the nano‐ and 1 µm‐silicon samples present obviously different mechanochemical behaviors from the 5 µm‐silicon sample, such as electrode crack, particle pulverization/crack as well as volume expansion; in addition, the micro‐silicon samples possess much thinner SEI layer than the nano‐silicon samples upon cycling, and also differences in SEI compositions. It is hoped this comprehensive study and understanding should offer critical insights into the exclusive and customized modification strategies to diverse silicon anodes ranging from nano to microscale.

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Section: Introductionmentioning

confidence: 99%

Benchmarking the Effect of Particle Size on Silicon Anode Materials for Lithium‐Ion Batteries

Dong

et al. 2023

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“…19,30,31 As a novel approach, designing conductive sheaths from the binders on the surface has achieved some remarkable results. 32–34 However, many of these coating materials suffer from the drawback of impeding Li-ion diffusion kinetics and are prone to brittle failure due to their limited ability to withstand severe volume expansion.…”

Section: Introductionmentioning

confidence: 99%

“…19,30,31 As a novel approach, designing conductive sheaths from the binders on the surface has achieved some remarkable results. [32][33][34] However, many of these coating materials suffer from the drawback of impeding Li-ion diffusion kinetics and are prone to brittle failure due to their limited ability to withstand severe volume expansion. Several conductive polymers, including PPy, 35 PANI, 36 and PEDOT-PSS, 37 have demonstrated promising electrochemical performance when incorporated into Si anodes.…”

Section: Introductionmentioning

confidence: 99%

Modified polyacrylonitrile cross-linked with carboxymethyl cellulose constructing a hydrogen bonding network for high-performance silicon anodes

Li,

Wan,

et al. 2023

Inorg. Chem. Front.

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“…Conjugated polymers form the basis of numerous aspects of chemical and materials research including, but not limited to, organic electronic devices, − energy storage, − fluorescent biosensors and therapeutics, − and visible-light-driven photocatalysis. , The intense interest in these materials is due, in part, to their large degree of broadly tunable electronic and physical properties. While these properties are typically dictated by the identity of the initial monomer, they may also be influenced by the chain length, monomer sequence, and side chain composition. − However, the inherent disperse nature of polymers often prevents the development of clear structure–property relationships that are needed to further elucidate fundamental processes and advance the application of these materials.…”

Section: Introductionmentioning

confidence: 99%

Sequence-Defined Conjugated Oligomers in Donor–Acceptor Dyads

Mills,

Rahman,

Zigelstein

et al. 2023

J. Am. Chem. Soc.

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Conjugated macromolecules have a rich history in chemistry, owing to their chemical arrangements that intertwine physical and electronic properties. The continuing study and application of these systems, however, necessitates the development of atomically precise models that bridge the gap between molecules, polymers, and/or their blends. One class of conjugated polymers that have facilitated the advancement of structure− property relationships is discrete, precision oligomers that have remained an outstanding synthetic challenge with only a handful of reported examples. Here we show the first synthesis of molecular dyads featuring sequence-defined oligothiophene donors covalently linked a to small-molecule acceptor. These dyads serve as a platform for probing complex photophysical interactions involving sequence-defined oligomers. This assessment is facilitated through the unprecedented control of oligothiophene length-and sequence-dependent arrangement relative to the acceptor unit, made possible by the incorporation of hydroxyl-containing side chains at precise positions along the backbone through sequencedefined oligomerizations. We show that both the oligothiophene sequence and length play complementary roles in determining the transfer efficiency of photoexcited states. Overall, the work highlights the importance of the spatial arrangement of donor−acceptor systems that are commonly studied for a range of uses, including light harvesting and photocatalysis.

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Formation of hierarchically ordered structures in conductive polymers to enhance the performances of lithium-ion batteries

Cited by 89 publications

References 48 publications

Benchmarking the Effect of Particle Size on Silicon Anode Materials for Lithium‐Ion Batteries

Benchmarking the Effect of Particle Size on Silicon Anode Materials for Lithium‐Ion Batteries

Modified polyacrylonitrile cross-linked with carboxymethyl cellulose constructing a hydrogen bonding network for high-performance silicon anodes

Sequence-Defined Conjugated Oligomers in Donor–Acceptor Dyads

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