A High‐Performance Lithium‐Ion Capacitor Based on 2D Nanosheet Materials

Li, Shaohui; Chen, Jingwei; Cui, Mengqi; Cai, Guofa; Wang, Jiangxin; Cui, Peng; Gong, Xuefei; Lee, Pooi See

doi:10.1002/smll.201602893

Cited by 71 publications

(54 citation statements)

References 53 publications

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“…The long‐term cyclability of NICs is very crucial and determines the superiority of the system . NICs showed a stability of ≈80% after 2500 cycles when tested at 3.5 A g −1 at room temperature (25 °C), while NICs showed a stability of ≈70% after 2500 cycles when tested at high temperature (50 °C) and both the NICs maintain a near ≈100% coulombic efficiency (Figure e).…”

Section: Resultsmentioning

confidence: 99%

High Volumetric Quasi‐Solid‐State Sodium‐Ion Capacitor under High Mass Loading Conditions

Thangavel

Kannan

Ponraj

et al. 2018

Adv Materials Inter

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raises questions on their future use in large-scale energy storage devices. [2,4] Sodium-ion capacitors (NICs) are promising alternative devices owing to the wide availability of sodium resources and their competence for demonstrating higher performance than LICs. [5,6] NICs are fabricated by coupling a battery-type faradic electrode that stores sodium ions along with an electrical double-layer capacitor (EDLC)-type porous carbon electrode that stores anions simultaneously via quick surface adsorption. [7,8] NICs that exhibit enhanced energy retention at high power along with low energy loss per cycle is extensively under research.To date, several NICs have been studied and demonstrated a remarkable gravimetric energy-power performance usually at low mass loading conditions. For practical applications, a high volumetric performance with high mass loading is crucial. But it faces several major challenges: (i) high active mass loading leads to poor electrolyte penetration deeper into thicker electrodes and thereby making causing severe ionic diffusion and electron transport losses, (ii) achieving a high stability and high rate performance at high mass loading conditions is difficult as a small morphology change could simulate electrode cracking or peeling from current collectors, (iii) very high amount of conductive carbon in battery-type electrode and carbon itself as battery-type electrode greatly decreases the volumetric performance. [9][10][11][12][13] Furthermore, safety issues related to liquid electrolyte inflammability, and leakage must be seriously addressed with an alternative. [14][15][16][17][18][19] Battery electrodes in NICs primarily use intercalationtype compounds such as hard carbon, NaTi 2 (PO 4 ) 3 , NiCo 2 O 4 , Na 2 Fe 2 (SO 4 ) 3 , and Na 3 Ti 2 O 7 . [20][21][22][23] The sluggish diffusioncontrolled sodium-ion storage in these compounds enables insertion of a limited number of sodium ions into the battery electrode at higher power and, lowers the energy output. [24][25][26] However, utilizing the strategy of sodium-ion storage on the surface of the battery electrode by quick surface pseudocapacitance is advantageous over diffusion-controlled bulk storage. [27][28][29] NICs driven by cationic surface pseudocapacitive intercalation could deliver superior energy, especially at high power, along with longer cycle life even under high mass loading conditions. The new approach could boost both the gravimetric and The sodium-ion capacitor (NIC) represents an important research approach to bridge the gap between batteries and capacitors, but is still limited by inferior energy behavior at high power, low volumetric performance, low electrode mass loading, and safety issues with conventional liquid electrolyte. Herein, a high-performing, kinetically superior, and safer quasi-solid-state NIC utilizing the fast sodium storage in TiO 2 and rapid ion adsorption on a biomassderived porous carbon with a sodium-ion conducting P(VDF-HFP) gel polymer electrolyte is presented. Owing to high mass loading, low gr...

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Section: Resultsmentioning

confidence: 99%

High Volumetric Quasi‐Solid‐State Sodium‐Ion Capacitor under High Mass Loading Conditions

Thangavel

Kannan

Ponraj

et al. 2018

Adv Materials Inter

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“…In parallel to the applications as electrodes in supercapacitors discussed above, MnO x ‐based materials have been studied as both cathodes and anodes in various rechargeable ion batteries, such as Li, Na, Mg, and Zn ion batteries. Unlike in a supercapacitor, there are more factors that affect the overall electrochemical performances of a battery, besides the electrode material itself.…”

Section: Mnox‐based Materials For Battery Applicationsmentioning

confidence: 99%

Manganese‐Oxide‐Based Electrode Materials for Energy Storage Applications: How Close Are We to the Theoretical Capacitance?

Wang

2018

Advanced Materials

104

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Of the transition metals, Mn has the greatest number of different oxides, most of which have a special tunnel structure that enables bulk redox reactions. The high theoretical capacitance and capacity results from a greater number of accessible oxidation states than other transition metals, wide potential window, and the high natural abundance make MnO species promising electrode materials for energy storage applications. Although MnO electrode materials have been intensely studied over the past decade, their electrochemical performance is still insufficient for practical applications. Currently, there is a trade-off between specific capacitance and loading mass. MnO species have intrinsically poor electrical conductivity, and current structural designs are not sophisticated enough to accommodate enough redox-active sites. Recent studies have certainly made progress in increasing capacitance through making use of electrically conductive components and controlling the morphology of the MnO species to expose more surface area. To increase the capacitance of MnO electrodes to the largest extent without limiting loading mass, further structural design at the nanoscale and manipulation of the electrically conductive component are required. An ideal nanostructure is proposed to guide future research toward closing the gap between achieved and theoretical capacitance, without limiting the loading mass.

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“…Electrode and device fabrication GO was prepared using a modified Hummer's method 35 . An aqueous dispersion of GO (2 mg mL −1 ) was sonicated for 2 h and then drop-casted on a glass substrate with an area density of 0.21 mL cm −2 or 0.053 mL cm −2 (for irradiation with a 1030-nm or 515-nm wavelength laser) and allowed to dry overnight at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Fully laser-patterned stretchable microsupercapacitors integrated with soft electronic circuit components

et al. 2018

Self Cite

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Stretchable energy storage devices are prerequisites for the realization of autonomous elastomeric electronics. Microsupercapacitors (MSCs) are promising candidates for this purpose due to their high power and energy densities, potential for miniaturization, and feasibility of embedding in circuits; however, efforts to realize stretchable MSCs have mostly relied on strain-accommodating materials and have suffered from limited stretchability, low conductivity, or complicated patterning processes. Here, we designed and fabricated a stretchable MSC based on reduced-grapheneoxide/Au heterostructures patterned by facile and versatile direct laser patterning. An interconnected and stable 3D network composed of vertically oriented heterostructures was realized by high-repetition-rate femtosecond laser pulses. Upon transferring to polydimethylsiloxane (PDMS), the 3D network achieved a high conductivity of~10 5 S m −1 , and the conductivity could be maintained at~10 4 S m −1 even at 50% strain. A fully laser-patterned stretchable electronics system was integrated with embedded MSCs, which will find applications in soft robotics, wearable electronics, and the Internet of Things.

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A High‐Performance Lithium‐Ion Capacitor Based on 2D Nanosheet Materials

Cited by 71 publications

References 53 publications

High Volumetric Quasi‐Solid‐State Sodium‐Ion Capacitor under High Mass Loading Conditions

High Volumetric Quasi‐Solid‐State Sodium‐Ion Capacitor under High Mass Loading Conditions

Manganese‐Oxide‐Based Electrode Materials for Energy Storage Applications: How Close Are We to the Theoretical Capacitance?

Fully laser-patterned stretchable microsupercapacitors integrated with soft electronic circuit components

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