Anomalous Self‐Optimizing Microporous Graphene‐Based Lithium‐ion Battery Anode from Laser Activation of Small Organic Molecules

Zhang, Binghao; Cheng, Le; Huang, Libei; Tang, Yan; Fang, Yongjin; Li, Tao; Ye, Ruquan; Liu, Qi

doi:10.1002/smtd.202200280

Cited by 4 publications

(3 citation statements)

References 52 publications

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“…Such mutual enhancement guarantees sufficient graphite exfoliation and high-level doping simultaneously, leading to high yield of N-doped graphene. [132] In addition to these methods, Zhang et al [133] recently developed a facile laser scribing approach for constructing N-doped PG (Figure 11e). With the features of generous defects, expanded interlayer spacing, and attractive porous structure, the electrode delivers an unprecedented reversible capacity of ≈5860 mAh g −1 after 2000 cycles at 200 mA g −1 .…”

Section: N Dopingmentioning

confidence: 99%

Section: Graphene Derivatives Anodesmentioning

confidence: 99%

mentioning

confidence: 99%

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On the Road to the Frontiers of Lithium‐Ion Batteries: A Review and Outlook of Graphene Anodes

Sun

et al. 2023

Advanced Materials

130

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Graphene with fascinating physicochemical properties has been regarded as one of the most promising candidates to substitute the commercial graphite anode for next-generation lithium-ion batteries (LIBs). [1] As originally suggested by Dahn's group, Li ions can be adsorbed on each side of graphene, forming a Li 2 C 6 stoichiometry with a theoretical specific capacity of 744 mAh g −1 , twice that of graphite (372 mAh g −1 of the first-stage LiC 6 intercalation compound). [2] However, in situ Raman spectroscopy reveals that it is difficult to achieve high Li coverage on graphene because of the low binding energy of Li with carbon and the strong Coulombic repulsion between the adsorbed Li ions. [3] Using density functional theory (DFT) calculations, Lee et al. also found that Li cannot reside on the surface of pristine graphene since its adsorption energy is positive for the entire range of Li content. [4] Therefore, the Li storage capacity of pristine graphene is far from its theoretical value, and is even inferior to that of graphite. Accordingly, it was proposed that defective graphene presents superior Li adsorption because of the increased charge transfer between Li and the defects, and moreover, the specific capacity rises with the increase of defects densities. [5] In the case of the maximum divacancy defect density, the Li storage capacity can reach up to 1675 mAh g −1 . In this regard, reduced graphene oxide (rGO), a form of graphene prepared by a chemical oxidation-exfoliation-reduction process, has been proven to be a potential anode by virtue of its abundant defects and the residual O-containing functional groups. [6] On the other hand, rGO also exhibits the advantages of mass production from the reduction of graphene oxide (GO) with contained costs, which is an essential step for practical applications. [7] As a result, rGO anode is more frequently studied as compared to its pristine graphene counterpart.The groundbreaking work of graphene anodes was reported in 2008 by Honma's group, who demonstrated that the incorporation of carbonaceous materials, i.e., carbon nanotubes (CNTs) and fullerenes (C 60 ), into graphene sheets can efficiently expand the interlayer spacing, thus higher Li storage capacities. [8] Soon Graphene has long been recognized as a potential anode for next-generation lithium-ion batteries (LIBs). The past decade has witnessed the rapid advancement of graphene anodes, and considerable breakthroughs are achieved so far. In this review, the aim is to provide a research roadmap of graphene anodes toward practical LIBs. The Li storage mechanism of graphene is started with and then the approaches to improve its electrochemical performance are comprehensively summarized. First, morphologically engineered graphene anodes with porous, spheric, ribboned, defective and holey structures display improved capacity and rate performance owing to their highly accessible surface area, interconnected diffusion channels, and sufficient active sites. Surface-modified graphene anodes with less aggreg...

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Section: N Dopingmentioning

confidence: 99%

Section: Graphene Derivatives Anodesmentioning

confidence: 99%

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On the Road to the Frontiers of Lithium‐Ion Batteries: A Review and Outlook of Graphene Anodes

Sun

et al. 2023

Advanced Materials

130

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Laser‐Induced Graphene Toward Flexible Energy Harvesting and Storage Electronics

Yang,

Yu,

Zhang

et al. 2024

Adv Materials Technologies

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Energy harvesting and storage devices play an increasingly important role in the field of flexible electronics. Laser‐induced graphene (LIG) with hierarchical porosity, large specific surface area, high electrical conductivity, and mechanical flexibility is an ideal candidate for fabricating flexible energy devices which supply power for other electronic components. Through a simple laser irradiation process with designable routes, abundant precursors (or substrates) rapidly transform into patterned LIG without any other treatments. The structure and physicochemical properties of LIG can be regulated by controlling the processing strategies and parameters, enabling the optimization of device performance. The laser scribing method, as a non‐contact and in situ technique, proves to be efficient in integrating different LIG‐based devices, resulting in all‐in‐one flexible power platforms. Here, a systematic summary of recent advancements in LIG‐based flexible energy electronics is presented. The controllable synthesis of LIG, functional LIG, and 3D architectures are described by elucidating corresponding mechanisms and processing strategies. An overall review of flexible energy conversion and storage devices based on LIG is presented. Eventually, the challenges and opportunities of LIG‐based materials in flexible energy conversion and storage are briefly discussed.

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Reducing Carbonaceous Salts for Facile Fabrication of Monolayer Graphene

Yuan

Shuang

et al. 2023

Small Methods

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thermal, electrical, and optical properties. [2] In particular, graphene exhibits extremely high mobility of charge carriers, enormously large specific surface area, and superior thermal conductivity, which allow graphene to be widely applied in the fields of energy conversion and storage, materials, environment, and biomedicine. [3] The huge demand for its application thus necessitates the development of large-scale, low-cost, and efficient synthesis of graphene. [4] So far, various methods have been developed to synthesize graphene, such as mechanical cleavage of graphite, chemical vapor deposition (CVD), epitaxial growth, reduction of exfoliated graphene oxide, chemical pyrolysis, and flash Joule heating. [5] The monolayer graphene was first obtained in 2004 with a tape-assisted mechanical exfoliation of graphite. [6] Similarly, KOH-assisted microwave exfoliation was also used to synthesize porous graphene oxide paper in 2011. [7] The simple mechanical cleavage operation is easy to follow, but its scalability, yield efficiency, and product quality need further improvement. Instead, CVD technique was adopted in the preparation of high-quality graphene but it suffered from high cost, low yield, and requirement of proper substrates that limited the wider application of graphene. [8] Alternatively, Sutter obtained epitaxially grown graphene on SiC in 2009 and this method is now capable of yielding continuous, uniform, and large-area graphene though isolating graphene from the substrate still remains a challenge. [9] Soon, reduction of exfoliated graphene oxide was also reported to obtain graphene, [10] followed by a chemical pyrolysis strategy demonstrated to synthesize graphene from sodium gluconate or sodium citrate in 2018. [11] These methods have their own merits of large-scale production but either their procedure complexity or environmental toxicity should be taken into further consideration. Recently, the flash Joule heating method to acquire graphene was proposed by Tour in 2020. [5f ] Such an economic, ultrafast, and scalable strategy was applied for the high-quality graphene production, but the flash graphene suffered from the lowest defect concentrations reported so far for graphene that severely limited the wider application (such as single atom catalysis). As such, it is of great significance to develop new methodology capable of providing freestanding graphene with merits of high-quality, high yield, low cost, and contamination-free to further boost its practical applications.Novel methods and mechanisms for graphene fabrication are of great importance in the development of materials science. Herein, a facile method to directly convert carbonaceous salts into high-quality freestanding graphene via a simple one-step redox reaction, is reported. The redox couple can be a combination of sodium borohydride (reductant) and sodium carbonate (oxidant), which can readily react with each other when evenly mixed/calcined and yield gram-scale, high-quality, contamination-free, micron-sized, freestanding gra...

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Anomalous Self‐Optimizing Microporous Graphene‐Based Lithium‐ion Battery Anode from Laser Activation of Small Organic Molecules

Cited by 4 publications

References 52 publications

On the Road to the Frontiers of Lithium‐Ion Batteries: A Review and Outlook of Graphene Anodes

On the Road to the Frontiers of Lithium‐Ion Batteries: A Review and Outlook of Graphene Anodes

Laser‐Induced Graphene Toward Flexible Energy Harvesting and Storage Electronics

Reducing Carbonaceous Salts for Facile Fabrication of Monolayer Graphene

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