Graphene-based Li-ion hybrid supercapacitors with ultrahigh performance

Leng, Kai; Zhang, Fan; Zhang, Long; Zhang, Tengfei; Wu, Yingpeng; Lu, Yanhong; Huang, Yi; Chen, Yongsheng

doi:10.1007/s12274-013-0334-6

Cited by 203 publications

(138 citation statements)

References 59 publications

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“…Compared with AC/LTO configuration, the value is higher mainly due to expended cell potential of 3.8 V, exceeding the typical value of 3.0 V, but it is lower than that of large scale AC/ graphite configuration [34] due to limited internal connection of electrodes and the efficiency of electrodes. It is also lower and graphene-based asymmetric Li-ion capacitor [39,40] for the intrinsic properties of materials.…”

Section: Resultsmentioning

confidence: 99%

Micro Li-ion capacitor with activated carbon/graphite configuration for energy storage

Li,

Wang

2015

Journal of Power Sources

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Section: Resultsmentioning

confidence: 99%

Micro Li-ion capacitor with activated carbon/graphite configuration for energy storage

Li,

Wang

2015

Journal of Power Sources

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“…According to the principle Q + = Q − (Q = m · Q sp , where Q and Q sp stands for the capacity, specific capacity and m is the mass of activated electrode material), thus the mass is balanced as the equation of m + /m 7− = Q sp+ /Q sp− . 2,16 For the best mass ratio of two different electrodes of LIC, a-GA, a-NGA and LTO required mass could be obtained by adjusting the thickness of electrodes disc.…”

Section: Fabrication Of Half Cells and Capacitors-allmentioning

confidence: 99%

Activated-Nitrogen-Doped Graphene-Based Aerogel Composites as Cathode Materials for High Energy Density Lithium-Ion Supercapacitor

Fan

Yang

Meng

et al. 2016

J. Electrochem. Soc.

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Lithium-ion supercapacitor (LIC) was fabricated with nanosheet Li 4 Ti 5 O 12 (LTO) as the negative electrode and activated-nitrogendoped graphene-based aerogel composites (a-NGA) as the positive electrode. The structure, morphology, and pore-size distribution of a-NGA was characterized by SEM, TEM, XRD, TGA, XPS, and nitrogen adsorption-desorption method. Electrochemical properties of a-NGA and nanosheet LTO were studied by galvanostatic charge and discharge test. The results indicated that KOH activation effectively modified the porous structure of NGA and improved its specific surface area to achieve better porosity, thereby enhancing the electrochemical properties. The assembled LIC provide a maximum energy density of 70 Wh kg −1 with the power density of 200 W kg −1 in a voltage of 1-3 V, and still retained an energy density of 21 Wh kg −1 at a high power density of 8000 W kg −1 . More significantly, its exhibits good cycling stability with retention of 64% after 10000 cycles at a high current density of 1.5 A g −1 .With the rapid development of sustainable energy, the demand for high-performance electrochemical energy storage services to make efficient use of energy has significantly increased. 1 Among these various energy storage services, lithium-ion batteries (LIB) and electrical double-layer capacitor (EDLC) have gained more attention in the past decades. 2 LIB has high energy density as high as 150-200 Wh kg −1 , and wide-voltage window; however, its power density is relatively low and its cycle life is poor compared with that of EDLC, EDLC exhibits superior power density up to 10 kW kg −1 , fast charge/discharge rates, and long cycle life. 3-5 However, the low energy density of EDLC limits its application. 3 To meet the increasing demand of high energy density, excellent power capability, and long cycle life, a novel hybrid energy storage service, lithium-ion hybrid supercapacitor (LIC), has emerged in 2001 by Amatucci. 6 Briefly, LIC is fabricated from LIB's insertion type materials and EDLC's materials as the negative electrode and positive electrode, respectively. In the charge/discharge process, anode electrode undergoes Li + insertion/desertion reaction and formation of anion double layer at the cathode electrode. By combining two different storage mechanisms of LIB and supercapacitors, the resulting LIC has a higher power density than the LIB and higher energy density than the EDLC and long cycle life. 3,4,7 In general, electrode materials for the electrochemical performance of LIC plays a vital role. 8 In recent years, various electrode materials of LIC that include cathode electrode and anode electrode have been widely published. Since 2001, Amatucci et al. 6 first assembled LIC with activated carbon (AC) as cathode and Li 4 Ti 5 O 12 (LTO) as anode in a non-aqueous electrolyte, in which energy density exceeds 10 Wh kg −1 . Subsequently, amounts of LIC with various electrode materials assembled are reported. Examples of anode electrode materials include LiCrTiO 4 , 9 α-Fe 2 O 3 , 10 prelithiat...

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“…It can be calculated from the Eq. 5, where σ is conductivity (unit: S/cm), t is sample thickness and Rs (unit: /sq) is electrical resistance of a sheet: σ = 1/tR s [5] Electrical resistances were measured by using the standard fourprobe technique. Samples were tested in the form of thin films (area: about 10 × 10 mm) which were prepared by pressing the freeze-dried N-G at 10 MPa using a compression machine.…”

Section: Resultsmentioning

confidence: 99%

“…[2][3][4][5][6][7][8] In principle, Li-HSCs are composed of a capacitor-type electrode and a lithium ion battery-type electrode in a Li + containing electrolyte. Therefore, compared with LIBs and SCs, Li-HSCs undergo different charge storage mechanism due to the unique reaction mechanisms of each electrode.…”

mentioning

confidence: 99%

Synthesis of Nitrogen-Doped Graphene as Highly Effective Cathode Materials for Li-Ion Hybrid Supercapacitors

Liu

Zhang

Shang

et al. 2015

J. Electrochem. Soc.

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In this paper, we report the possibility of utilizing nitrogen-doped graphene (N-G) as a novel cathode material for Li-ion hybrid supercapacitors (Li-HSCs) applications. N-G was prepared by a simple one-pot hydrothermal method, followed by freeze-drying in a vacuum treatment. Li-ion hybrid supercapacitors was fabricated using N-G as the cathode along with lithium-ion intercalated compound LiMn 2 O 4 as the anode in an aqueous medium. The energy density of the Li-HSCs can increase up to 22.15Wh kg −1 when the power density reached was 132 W kg −1 , and still retained 13 Wh kg −1 at a power density of 2000 W/kg. The LiMn 2 O 4 / N-G Li-HSCs assembly also shows good cyclic performance with about 80% of the initial value retained after 2000 galvanostatic cycles under high rate cyclic conditions. This result clearly indicates that N-G is a promising candidate for future application in a Li-HSCs configuration.Energy storage has become a global concern in modern society, and high-performance energy storage devices are in great demand. Among various electrical energy storage devices, lithium ion batteries (LIBs) with high energy density and supercapacitors (SCs) with excellent power density are currently considered to be two excellent candidates as novel, environmentally friendly, low-cost, and high-performance energy storage devices to meet the increasing demand. The LIBs commonly can store a large amount of energy, as high as 150-200 Wh kg −1 , but are confined by their low power density (below 1000 W kg −1 ) and poor cycle life (usually less than 1000 cycles). In contrast, SCs can provide much higher power density (10 kW kg −1 ), long cycle life (exceeding 10 5 cycles), and fast charge-discharge processes (within seconds), but suffer from much lower energy density (only 5-10 Wh kg −1 ). 1 Therefore, there has been great and urgent demand for high-performance energy storage devices with both high energy density and high power density.With a combination of the fast charging rate of SCs and the high energy density of LIBs, a novel supercapacitor-battery energy storage system, also called lithium ion hybrid supercapacitors (Li-HSCs) has emerged, which is expected to possess the best features of both SCs and LIBs. 2-8 In principle, Li-HSCs are composed of a capacitor-type electrode and a lithium ion battery-type electrode in a Li + containing electrolyte. Therefore, compared with LIBs and SCs, Li-HSCs undergo different charge storage mechanism due to the unique reaction mechanisms of each electrode. Capacitor-type electrode store energy by a reversible adsorption/desorption of ions, while battery-type electrode store energy though a Li-ion insertion/extraction reaction. 9-11 It is possible to aim at much larger energy density without sacrificing power energy and cycle life. Because of its competitive characteristics it is expected to be useful power sources for hybrid electric vehicles and electric vehicles. [12][13][14] In Li-HSCs, adsorption/desorption of ions occurs on the surface of the capacitor-type electrode while t...

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Graphene-based Li-ion hybrid supercapacitors with ultrahigh performance

Cited by 203 publications

References 59 publications

Micro Li-ion capacitor with activated carbon/graphite configuration for energy storage

Micro Li-ion capacitor with activated carbon/graphite configuration for energy storage

Activated-Nitrogen-Doped Graphene-Based Aerogel Composites as Cathode Materials for High Energy Density Lithium-Ion Supercapacitor

Synthesis of Nitrogen-Doped Graphene as Highly Effective Cathode Materials for Li-Ion Hybrid Supercapacitors

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