Binder-free 2D titanium carbide (MXene)/carbon nanotube composites for high-performance lithium-ion capacitors

Yu, Peng; Cao, Gejin; Yi, Sha; Zhang, Xiong; Li, Chen; Sun, Xianzhong; Wang, Kai; Ma, Yanwei

doi:10.1039/c8nr00380g

Cited by 224 publications

(120 citation statements)

References 71 publications

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“…Recently, 2D materials have been reported in the field of energy storage and conversion because of their high surface area and excellent physical properties . MXenes, as a new 2D material, has been proven to be promising electrode materials for various energy storage systems on the account of their high hydrophilicity . Their precursor MAX means a series of ternary compounds: M is transition metal, A is main group element, and X is usually carbon or nitrogen (e.g., Ti 3 C 2 T X ).…”

Section: Introductionmentioning

confidence: 99%

A MXene‐Coated Activated Carbon Cloth for Flexible Solid‐State Supercapacitor

et al. 2020

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Herein, a new electrode material HHK‐CC@Ti3C2TX (HHK‐CC = activated carbon cloth, TX = F, O, or OH) for a flexible solid‐state supercapacitor (SSC) is prepared by a simple method. The activated carbon cloth (HHK‐CC) is obtained by treating with potassium permanganate beforehand. The specific area, oxygen‐containing functional group, hydrophilicity, and electrical conductivity of the activated CC are increased significantly after the potassium permanganate treatment. A few layers of Ti3C2TX flakes are coated directly on the HHK‐CC. When the loading Ti3C2TX on the HHK‐CC@Ti3C2TX electrode is 3 mg cm−2, the prepared electrode achieves a high capacitance of 1033 mF cm−2 at the current density of 1 mA cm−2. After assembling as a symmetrical SSC, the flexibility and mechanical strength of the CC are still preserved and no significant capacitance decreasing is observed under the conditions of bending and deformation. The capacitance value remains at 94.2% after 1000 cycles, and a high power density of 0.779 W cm−2 is obtained at the energy density of 4.5 μWh cm−2. This work gives a new strategy for designing flexible supercapacitors.

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Section: Introductionmentioning

confidence: 99%

A MXene‐Coated Activated Carbon Cloth for Flexible Solid‐State Supercapacitor

et al. 2020

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“…However the electron delocalization is affected by the functionalized groups. [235] Ti 3 C 2 can interact with Li ions to form Ti 3 C 2 Li 2 which exhibits a theoretical cyclic capacity of 320 mA h g −1 . [38][39][40][41] As an example, Nb 2 C, Nb 2 CF 2 , Nb 2 C(OH) 2 and Ti 3 C 2 are found to be metallic conductors whereas Ti 3 C 2 T x is a semiconductor.…”

Section: Lithium-ion Batteries Applications Of Mxene-based Compositesmentioning

confidence: 99%

“…Due to the contribution of metal oxides to the entire capacity and maintenance of the framework of the Ti 3 C 2 T x films, the composites exhibit outstanding performance. [235] Copyright 2018, Royal Society of Chemistry. [169] As shown in Table 1, Ti 3 C 2 T x /NiCo 2 O 4 composite was first synthesized by an in situ growth method.…”

Section: Lithium-ion Batteries Applications Of Mxene-based Compositesmentioning

confidence: 99%

“…[71] To further enhance the electronic and ion conductivity of MXenes-based composites, it is feasible to combine with some specific materials with excellent electronic and ion conductivity property, such as Ag nanoparticles, [216] and CNTs, [70,151,235,251] and so on. There are many positive holes and crevices on the surface of Ti 3 C 2 T x /CNF composites, which can become points of connection by fibers spanning two parallel layers.…”

Section: Wwwadvmatinterfacesdementioning

confidence: 99%

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MXene‐Based Composites: Synthesis and Applications in Rechargeable Batteries and Supercapacitors

Yang

Bao

Jaumaux

et al. 2019

Adv Materials Inter

249

142

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The family of 2D transition metal carbides, nitrides, and carbonitrides (collectively called MXenes) is rapidly studied since the initial synthesis of Ti3C2Tx (MXene). The surface of MXenes etched by hydrofluoric acid has hydrophilic groups (F, OH, and O), which leads the surface to be negatively charged. Consequently, the negatively charged surface can facilitate the compounding of MXenes with other positively charged materials and prevent MXenes from aggregating with some negatively charged substances, thus promoting the formation of a stable dispersion. The MXene‐based composites have better electrochemical performance than both precursors due to synergistic effects. This review elaborates and discusses the development of MXene‐based composites. It is aimed to summarize the various methods of fabricating MXene‐based composites. The applications of MXene‐based composites in batteries and supercapacitors are presented along with analysis of their excellent electrochemical performances. Finally, the authors propose the approach for further enhancing the electrochemical performances of MXene‐based composite electrode materials.

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“…After Sn(IV) nanocomplex loading with the assistance of CTAB pre-pillaring, the layer stripes almost disappeared in CTAB-Sn(IV)@Ti 3 C 2 (Figure 7b), compared with the morphology of Sn(IV)@Ti 3 C 2 without prepillaring process (Figure 7c), indicating the probable intercalation of Sn 4 + into the interlayer space of MXene and cramming of the layer stripes. Using the conductive CNTs, Yu et al [82] developed a binder-free Ti 3 C 2 T x /CNT composite as anode to construct the LICs with AC cathode. When coupled with AC cathode, the assembled LICs achieved high energy and power densities of 105.56 Wh kg À 1 at 495 W kg À 1 and 10.8 kW kg À 1 at 45.31 Wh kg À 1 (Figure 7d).…”

Section: Mxenesmentioning

confidence: 99%

Recent Advances and Challenges of Two‐Dimensional Materials for High‐Energy and High‐Power Lithium‐Ion Capacitors

Hou

Qin

et al. 2019

Batteries & Supercaps

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ion capacitors (LICs) composed of a battery-type electrode and a capacitor-type electrode are highly competitive candidates for next-generation electrochemical energy storage devices, simultaneously achieving high energy and power densities. However, the present LICs are still hindered by the imbalance of electrode kinetics and capacity of anode and cathode. Recently, two-dimensional (2D) materials with unique structure and appealing properties have received extensive attentions for applications in LICs, with remarkable improvements from charge storage capacity to reaction kinetics. Herein, we review the recent advances in the applications of 2D materials for high-energy and high-power LICs. The key advantages and important roles of 2D materials are emphasized for the construction of LICs, including electrochemical active materials, ultrathin conductive and flexible supports for hybridization with other active materials, and 2D functional building blocks for assembling macroscopic hierarchical 3D frameworks. Finally, the challenges and prospects associated with the applications of 2D materials for high-performance LICs are discussed. especially power density and cycle life, nanostructured battery-type materials with high rate capability and long-term stability and optimized capacitor-type materials with high capacity should be continuously developed. [5][6]10] 2D materials are layered crystals with a thickness of single or few atoms, and often referred to nanosheets as well. [25] These ultrathin 2D nanosheets can be considered as elementary building blocks of the corresponding layered bulk materials and can be synthesized by exfoliation of the latter. Since graphene was discovered in 2004, [26] various 2D materials have been developed, including transition metal oxides (TMOs), transition metal dichalcogenides (TMDs), MXenes, polymers, phosphorene, boron nitride, etc. [27] The atomic-level thickness brings extraordinary physicochemical properties compared with the multilayer bulk materials, such as high SSA, excellent mechanical flexibility, tunable electronic structure, and enhanced electrochemical activities, making 2D materials highly attractive for electrochemical energy storage devices. [28] Also, the introduction of 2D materials has enabled great progress toward LICs with high energy density, high power density, and long cycle life.

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Binder-free 2D titanium carbide (MXene)/carbon nanotube composites for high-performance lithium-ion capacitors

Cited by 224 publications

References 71 publications

A MXene‐Coated Activated Carbon Cloth for Flexible Solid‐State Supercapacitor

A MXene‐Coated Activated Carbon Cloth for Flexible Solid‐State Supercapacitor

MXene‐Based Composites: Synthesis and Applications in Rechargeable Batteries and Supercapacitors

Recent Advances and Challenges of Two‐Dimensional Materials for High‐Energy and High‐Power Lithium‐Ion Capacitors

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