N-functionalized graphene quantum dots: Charge transporting layer for high-rate and durable Li4Ti5O12-based Li-ion battery

Khan, Firoz; Oh, Misol; Kim, Jae Hyun

doi:10.1016/j.cej.2019.03.161

Cited by 64 publications

(35 citation statements)

References 55 publications

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“…The results show that 1D nanostructures have better charge and ion transport capabilities than particle structures . The addition of graphene can further enhance the ability of charge transfer and ion transfer …”

Section: Resultsmentioning

confidence: 97%

Nitrogen‐Doped Graphene‐Buffered Mn₂O₃ Nanocomposite Anodes for Fast Charging and High Discharge Capacity Lithium‐Ion Batteries

Yuan

Chen

Zhang

et al. 2019

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such as electronic equipment, electrical vehicles, etc., [4,5] the low theoretical capacity of commercial LIBs' anode materials (graphite-372 mAh g −1 ) and low charging ability restrict the wider use of LIBs. [6] In order to obtain high capacity and fast charging LIBs, Si, Ge, and lots of resourcerich metal oxides and sulfides have been widely investigated. Unfortunately, most of these materials cannot afford fast charging process and their capacities decrease dramatically due to their low electrical conductivities and severe volume change. [7][8][9][10] Hence, in order to obtain high capacity and fast charging anode materials for LIBs to satisfy the demand in daily life, it is urgently desirable to develop anode materials for LIBs with low redox reaction potential, high theoretical capacity, and fast charging ability.Among these potential anode materials, Mn 2 O 3 is one of the most attractive anode materials owing to its low redox reaction potential, high theoretical capacity, and low cost. [11][12][13] However, as a metal oxide, its properties are also limited by its intrinsic low conductivity characteristic. To enhance its electrochemical performance, Mn 2 O 3 with different morphologies is designed, such as Mn 2 O 3 nanosheets, [14,15] hollow sphere, [16,17] nanoparticles, [18,19] and so on, but the capacity of these materials is still rapidly decreasing and cannot meet the needs of fast charging properties due to their aggregation and the varied charge transfer resistance during electrochemical reactions. The reduced graphene oxide (rGO) as a light weight and excellent conductor material has been applied in many fields. Adding rGO or nitrogen-doped rGO (N-rGO) can greatly increase the conductivity of the electrodes without consuming the energy density of batteries. [20][21][22] In addition to conductive agent, the nanocomposite structures with different dimensions can also improve battery performance. [23,24] Mai et al. reported VO 2 scroll/ nanobelt composites and Na 3 V 2 (PO 4 ) 3 nanoparticle/CNT nanowire composites with more than 20% capacity increase compared with pure VO 2 nanobelts and Na 3 V 2 (PO 4 ) 3 nanoparticle/ graphite nanoparticle composites, exhibiting high capacity and high cycling stability. [25] Thus, the synergistic combination of rGO with high conductivity, 1D nanomaterials with efficient electron transport pathway, and nanoparticles to filling the gaps Mn 2 O 3 is a promising anode material for lithium-ion batteries (LIBs) because of its high theoretical capacity and low discharge potential. However, low electronic conductivity and capacity fading limits its practical application. In this work, Mn 2 O 3 with 1D nanowire geometry is synthesized in neutral aqueous solutions by a facile and effective hydrothermal strategy for the first time, and then Mn 2 O 3 nanoparticle and nitrogen-doped reduced graphene oxide (N-rGO) are composited with Mn 2 O 3 nanowires (Mn 2 O 3 -GNCs) to enhance its volume utilization and conductivity. When used as an anode material for LIBs, the Mn 2 O 3 -GNCs...

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Section: Resultsmentioning

confidence: 97%

Nitrogen‐Doped Graphene‐Buffered Mn₂O₃ Nanocomposite Anodes for Fast Charging and High Discharge Capacity Lithium‐Ion Batteries

Yuan

Chen

Zhang

et al. 2019

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“…In 2019, the Kim group reported a fresh LTO/N-GQD/super-hierarchical anode material for LIBs. 129 Compared to pure LTO (Li 4 Ti 5 O 12 ), the LTO with N-GQDs increases the specific capacity by 23% and exhibits better electrical properties, such as discharge capacity maintained at about 170 mA h g À1 at 20 1C for over 200 cycles as shown in Fig. 8b.…”

Section: + /Na + Batteriesmentioning

confidence: 97%

Graphene quantum dots for energy storage and conversion: from fabrication to applications

Liu

Sun

Gao

et al. 2020

Mater. Chem. Front.

117

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“…[50,51] Kim et al used N-functionalized graphene quantum dots (N-GQDs) interfacial layer to protect Li 4 Ti 5 O 12 (LTO) from ambient degradation and dissolution (Figure 5AÀ B). [52] N-GQDs interfacial layer acts as a charge transfer layer preventing the LTO electrode from side reactions with electrolyte, and forms a thin and smooth solid-electrolyte interphase layer on LTO surface. Experimental results demonstrate that N-GQDs act as an effective charge transfer layer to enhance the performance (~23% at 50 C) of LIBs.…”

Section: Composites Of Cds and Inorganic Materialsmentioning

confidence: 99%

Applications of Carbon Dots in Next‐generation Lithium‐Ion Batteries

et al. 2020

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Lithium-ion battery (LIB) is a dominating power source in the market owing to its high energy density, good cycling stability and environmental benignity. However, technical challenges remain after years' optimization and commercialization, which are detrimental to the expected performance and lifespan of LIBs. For instance, many cathode materials of LIBs suffer from rapid capacity fading and poor high-rate performance, which are ascribed to self-aggregation, dissolution and fast increased charge transfer resistances during cycles. In terms of the anode materials, low coulombic efficiency, electrolyte depletion and safety issues are common. In addition, the liquid electrolyte systems trigger safety concerns because flammable and volatile organic solvents are necessary. Recently, carbon dots (CDs) emerge as a sound material to address those challenges of LIBs, and also present promising applications in bioimaging, fluorescence sensing, photo/electro-catalysis, and electroluminescence. This review will overlook the state-of-the-art advances in the employment of CDs based composites to build cathode/anode materials and electrolytes in LIBs, through tailoring the internal structures and the surface states of electrode materials, and being additives in electrolyte, to improve the performances of the next-generation LIBs. The major challenges and opportunities in front of CDs in LIBs will be outlined and discussed in detail.

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N-functionalized graphene quantum dots: Charge transporting layer for high-rate and durable Li4Ti5O12-based Li-ion battery

Cited by 64 publications

References 55 publications

Nitrogen‐Doped Graphene‐Buffered Mn₂O₃ Nanocomposite Anodes for Fast Charging and High Discharge Capacity Lithium‐Ion Batteries

Nitrogen‐Doped Graphene‐Buffered Mn₂O₃ Nanocomposite Anodes for Fast Charging and High Discharge Capacity Lithium‐Ion Batteries

Graphene quantum dots for energy storage and conversion: from fabrication to applications

Applications of Carbon Dots in Next‐generation Lithium‐Ion Batteries

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N-functionalized graphene quantum dots: Charge transporting layer for high-rate and durable Li4Ti5O12-based Li-ion battery

Cited by 64 publications

References 55 publications

Nitrogen‐Doped Graphene‐Buffered Mn2O3 Nanocomposite Anodes for Fast Charging and High Discharge Capacity Lithium‐Ion Batteries

Nitrogen‐Doped Graphene‐Buffered Mn2O3 Nanocomposite Anodes for Fast Charging and High Discharge Capacity Lithium‐Ion Batteries

Graphene quantum dots for energy storage and conversion: from fabrication to applications

Applications of Carbon Dots in Next‐generation Lithium‐Ion Batteries

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Product

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Nitrogen‐Doped Graphene‐Buffered Mn₂O₃ Nanocomposite Anodes for Fast Charging and High Discharge Capacity Lithium‐Ion Batteries

Nitrogen‐Doped Graphene‐Buffered Mn₂O₃ Nanocomposite Anodes for Fast Charging and High Discharge Capacity Lithium‐Ion Batteries