Solvothermal‐Derived S‐Doped Graphene as an Anode Material for Sodium‐Ion Batteries

Quan, Bo; Jin, Aihua; Yu, Seung Ho; Kang, Seok Mun; Jeong, Juwon; Abruña, Héctor D.; Jin, Longyi; Piao, Yuanzhe; Sung, Yung Eun

doi:10.1002/advs.201700880

Cited by 125 publications

(72 citation statements)

References 41 publications

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“…The atomic content of S in the CT‐rGO@LTO and CM‐rGO@LTO composites are 1.62% and 1.23%, respectively. Doping appropriate amount of S element can not only increase the electronic conductivity of LTO, but also boost the Li‐ion migration by expanding the interlayer spacing of rGO sheets . The doping sites of S atoms in rGO are shown in Figure a.…”

Section: Resultsmentioning

confidence: 99%

Engineering of Oxygen Vacancy and Electric‐Field Effect by Encapsulating Lithium Titanate in Reduced Graphene Oxide for Superior Lithium Ion Storage

Meng

et al. 2019

Small Methods

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Rational design of nanostructured electrode materials is highly desired for developing high‐performance lithium‐ion batteries (LIBs). Encapsulating electrode materials in reduced graphene oxide (rGO) shows great potential for manipulation of physicochemical properties at the atomic level, promoting remarkable electrochemical properties. Here, a controllable strategy is proposed to synthesize a “pomegranate‐like” 3D rGO encapsulated lithium titanate composite (CT‐rGO@LTO). The experimental results demonstrate the enriched oxygen vacancies in LTO and the electronic interactions at the interface between LTO and rGO. Density functional theory (DFT) calculations confirm the charge redistribution in the CT‐rGO@LTO composite, establishing a strong electric field with oxygen vacancies. Furthermore, the extra active sites in rGO for Li‐ion storage are investigated via in situ Raman tests. Benefiting from the oxygen vacancies and the electric‐field effect, the CT‐rGO@LTO electrode delivers excellent cycling stability with a capacity retention of 87.1% after 1500 cycles at 5 C. Moreover, the CT‐rGO@LTO electrode is adopted to assemble a full cell with a LiCoO2 cathode, which also displays superior rate capability with capacities of 139.4 and 109.7 mA h g−1 at 0.5 and 10 C, respectively. This work provides profound insights of fabricating high‐performance electrode materials for advanced energy storage.

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Section: Resultsmentioning

confidence: 99%

Engineering of Oxygen Vacancy and Electric‐Field Effect by Encapsulating Lithium Titanate in Reduced Graphene Oxide for Superior Lithium Ion Storage

Meng

et al. 2019

Small Methods

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“…during pyrolysis process and the removal of small NaCl template. [14] The (002) diffraction peaks of S-N-PCNs, N-PCNs, and PCNs are concentrated at around 25.66°, 24.42°, and 21.88°, respectively, corresponding to interlayer distances of 3.47, 3.64, and 4.03 Å (calculated based on the Bragg's law). Figure 1h-k display the high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and energy-dispersive spectroscopy (EDS) element mapping of S-N-PCNs, confirming that S and N elements were homogeneously doped in the porous carbon nanosheets framework.…”

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confidence: 99%

Fast Redox Kinetics in Bi‐Heteroatom Doped 3D Porous Carbon Nanosheets for High‐Performance Hybrid Potassium‐Ion Battery Capacitors

Liu

Chen

et al. 2019

Advanced Energy Materials

202

199

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instance, lithium-ion hybrid capacitors (LIHCs) consisting of an activated carbon (AC) cathode and a prelithiated graphite anode have been successfully commercialized and widely applied in small portable electronics. [2a] Nevertheless, the limited reserves and high cost of Li resources likely hinder them from applying in large-scale energy storage devices. As a new class of hybrid capacitors, potassium-ion hybrid capacitors (PIHCs) show great potential as alternative to LIHCs due to the profusion and low cost of potassium resources. [3] In addition, the redox potential of the K + /K (−2.936 V vs standard hydrogen electrode) is quite close to that of Li + /Li (−3.040 V), indicating PIHCs can afford a considerably high working voltage and energy density. [4] Unfortunately, the relatively large radius of K + (1.38 Å) tends to behave sluggish redox reaction kinetics for most of potassium-ion batteries (PIBs) anodes.As compared to LIHCs, the research regarding PIHCs is still in its infant stage and thus calls for extensive exploration on newly favorable electrode materials, in the hope to enhance the kinetics of K + insertion/extraction so that it can match with the fast kinetics of capacitor-style cathodes. To date, various electrode materials, such as carbonaceous materials, [5] metal alloys, [6] oxides, [7] sulfides, [8] and MXene, [9] have been extensively studied as battery-type anodes. Among them, carbon-based material, thanks to the merits of abundant resources, low cost, and high conductivity, has been regarded as one of the most promising electrode materials for the practical application of PIHCs. [10] However, the implementation of carbon-based electrode material for high-performance PIBs requires high conductivity and a rather large interlayer spacing for facilitating insertion and extraction of bulky K + and improving the redox reaction Kinetics. Therefore, it still remains a grand challenge to address the major issues existed in carbon-based anodes, including limited reversible capacities, unsatisfactory cycling stability, and poor rate performance, which result from the large volume change (61% caused by KC 8 vs 10% by LiC 6 ). [5] Heteroatom-doped carbonbased materials have exhibited the enhanced electrochemical properties for potassium-ion storage due to the increased electric conductivity and more active sites for potassium-ion storage by generating extrinsic defects. [11] In comparison with nitrogen, sulfur has a relatively large size but small electronegativity, Potassium-ion hybrid capacitors (PIHCs) hold the advantages of high-energy density of batteries and high-power output of supercapacitors and thus present great promise for the next generation of electrochemical energy storage devices. One of the most crucial tasks for developing a highperformance PIHCs is to explore a favorable anode material with capability to balance the kinetics mismatch between battery-type anodes and capacitortype cathode. Herein, a reliable route for fabricating sulfur and nitrogen codoped 3D porous carbon nanosheets...

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“…Further, high‐resolution S 2p XPS spectra was applied to probe the specific information of S species on the surface of KPP‐SDC. Figure 2E presents that the S 2p spectrum can be simulated into three peaks: two main peaks at 164.4 and 165.5 eV are due to S 2p 3/2 and S 2p 1/2 orbits from the –C–S–C– and thiophene‐type S, while one minor peak at 168.3 eV is corresponding to oxidized S (–C–S(O) 2 –C–) . The high content of thiophene‐type S contributes to the storage of more Li + on the surface of KPP‐SDC .…”

Section: Resultsmentioning

confidence: 97%

Sulfur‐doped shaddock peel–derived hard carbons for enhanced surface capacity and kinetics of lithium‐ion storage

Huang

et al. 2020

Int J Energy Res

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Summary Sulfur doping has been regarded an energetic route to optimize the lithium storage properties of carbon‐based electrode materials. In this work, sulfur‐doped shaddock peel–derived hard carbon is successfully prepared by a KOH‐ and C2H5NS‐assisted pyrolysis procedure. It is demonstrated that sulfur doping has strong effect on surface activation and graphitization enhancement, which results in the significant enhancement of the surface adsorption capacity and reaction kinetics of the hard carbon materials. When employed as a lithium ion batteries (LIBs) anode, the as‐obtained hard carbon demonstrates excellent cycling and rate properties, presenting a great specific capacity of 738 mAhg−1 at 50 mAg−1 after 200 cycles, as well as 491 mAhg−1 at 200 mAg−1 after 300 cycles. Even at 1000 and 2000 mAg−1, the hard carbon provides a large rate capacity of 283 and 179 mAhg−1, respectively. Besides, it is revealed that the Li+ storage process is determined by the surface‐induced pseudocapacitive process, whose capacitive proportion reach 60% at 0.5 mVs−1. This work suggests that the low cost and eco‐friendly sulfur‐doped shaddock peel–derived hard carbon is a very prospective LIB anode material.

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Solvothermal‐Derived S‐Doped Graphene as an Anode Material for Sodium‐Ion Batteries

Cited by 125 publications

References 41 publications

Engineering of Oxygen Vacancy and Electric‐Field Effect by Encapsulating Lithium Titanate in Reduced Graphene Oxide for Superior Lithium Ion Storage

Engineering of Oxygen Vacancy and Electric‐Field Effect by Encapsulating Lithium Titanate in Reduced Graphene Oxide for Superior Lithium Ion Storage

Fast Redox Kinetics in Bi‐Heteroatom Doped 3D Porous Carbon Nanosheets for High‐Performance Hybrid Potassium‐Ion Battery Capacitors

Sulfur‐doped shaddock peel–derived hard carbons for enhanced surface capacity and kinetics of lithium‐ion storage

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