Conducting and Lithiophilic MXene/Graphene Framework for High-Capacity, Dendrite-Free Lithium–Metal Anodes

Shi, Haodong; Zhang, Chuanfang; Lu, Pengfei; Dong, Yanfeng; Wen, Pengchao

doi:10.1021/acsnano.9b07710

Cited by 170 publications

(119 citation statements)

References 63 publications

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“…For the stable structure of NbC @ N‐G, the diffusion processes exhibit similar energy profiles along the different pathway of the S1 and S2 (Figure 3h). The Li + ions only need to overcome very small energy barriers range from 0.23 to 0.27 eV to diffuse on the surface of NbC @ N‐G, which is more advantageous compared with graphene (0.32 eV), [ 46 ] monolayer MXene (Ti 3 C 2 T x , ≈0.42 eV), [ 18 ] MoO 3 bulk (0.75 and 0.55 eV), [ 47 ] MoS 2 (0.25 eV), [ 48 ] and Ti 2 CO 2 (0.28 eV). [ 49 ] That is to say, the NbC @ N‐G is more favorable to build a stabilized configuration which not only enable overwhelming adsorption ability toward Li atoms, but also accelerates the diffusion of Li + ions.…”

Section: Resultsmentioning

confidence: 99%

Rational Design of Multifunctional Integrated Host Configuration with Lithiophilicity‐Sulfiphilicity toward High‐Performance Li–S Full Batteries

Wei

Wang

Zhang

et al. 2020

Adv Funct Materials

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High-energy-density Li-S batteries are considered one of the next-generation energy storage systems, but the uncontrolled Li-dendrite growth in Li metal anodes and the shuttling of polysulfides in S cathode severely impede the commercial development of Li-S batteries. Herein, a conductive composite architecture that is made up of bio-derived N-doped porous carbon fiber bundles (N-PCFs) with co-imbedded cobalt and niobium carbide nanoparticles is employed as a multifunctional integrated host for simultaneously addressing the challenges in both Li anodes and S cathodes. The implantation of Co and NbC nanoparticles bestows the N-PCFs matrix with synergistically enhanced degree of graphitization, electrical conductivity, hierarchical porosity, and surface polarization. Theoretical calculations and experimental results show that NbC with specific lithiophilic and sulfiphilic features can synchronously regulate the Li and S electrochemistry by realizing homogeneous lithium deposition with suppressed Li-dendrite growth and exerting catalytic effects for promoting the polysulfide conversion together with fast Li 2 S nucleation. Hence, the assembled Li-S full batteries exhibit a superb rate capability (704 mAh g −1 at 5 C) and cycling life (≈82.3% capacity retention after 500 cycles) at a sulfur loading over 3.0 mg cm −2 , as well as high reversible areal capacity (>6.0 mAh cm −2) even at a higher sulfur loading of 6.7 mg cm −2 .

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Section: Resultsmentioning

confidence: 99%

Rational Design of Multifunctional Integrated Host Configuration with Lithiophilicity‐Sulfiphilicity toward High‐Performance Li–S Full Batteries

Wei

Wang

Zhang

et al. 2020

Adv Funct Materials

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“…Approximately 50 μL electrolyte was dropped into each cell. The assembled cells were pre‐cycled between 0.01 and 1 V at 200 μA cm −2 for five times to stabilize the SEI formation according to previous reports . After that, galvanostatic charge and discharge were applied to characterize the electrochemical properties of the pre‐cycled cells on a Land Battery Tester (Wuhan LAND, China).…”

Section: Methodsmentioning

confidence: 99%

Silicon Quantum Dots Induce Uniform Lithium Plating in a Sandwiched Metal Anode

Zhao

et al. 2020

ChemElectroChem

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Lithium (Li) metal anodes are demanded by high-energy Li batteries because Li has the highest capacity and low electrode potential. However, Li metal anodes usually show poor cyclability and unsafe deposition at anode/separator interfaces, which may increase the risk of short circuits. In this work, we fabricate a sandwiched structure of reduced graphene oxides (rGO) with silicon (Si) quantum dots (QDs) as the inducing agents between rGO layers. Because of the lithiophilicity of Si QDs, Li growth is favorably guided away from the unsafe anode/separator interface towards the interlayer positions, significantly improving the cyclability and safety of the Si-QDssandwiched rGO anode. The uniformly-distributed Si QDs and layered electrode structure can regulate Li plating/stripping to avoid the superficial Li growth and reduce the accumulation of solid electrolyte interphase. The growth-guiding strategy using the sandwiched structure provides a new approach to fabricating high energy Li-based battery anodes.

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“…Because of the largely available interspaces in MXene arrays, the growth of lithium was confined in the stripshaped channels (Figure 17h-k). [159b] Besides, other 3D scaffolds for Li metal anodes such as MXene/rGO aerogel (Figure 18a), [160] MXene/graphene framework (Figure 18b), [161] and interlayer-calated thin lithium electrode [162] were also designed for high performance and dendrite-free lithium metal batteries. Notably, Qian et al developed a novel method by using an amorphous liquid metal nucleation seed on MXene films to induce isotropic lithium nucleation and growth, so as to inhibit the growth of lithium dendrite (Figure 18c).…”

Section: Lithium Metal Anodementioning

confidence: 99%

MXenes for Rechargeable Batteries Beyond the Lithium‐Ion

et al. 2020

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past few decades. [2] In spite of the great success of the LIBs in consumer electronics and electric vehicles, their gridscale implementation is hindered by the limited lithium resources (only 20 ppm in the earth's crust) as well as the safety concerns. [3] In this regard, many other EES systems based on more abundant and less active elements, such as sodium (2.3%), potassium (2.1%), magnesium (2.3%), aluminum (8.2%), and zinc (75 ppm), have been developed and have already achieved significant progress. [1d,4] Historically, 2D layered materials have been employed as electrodes for batteries (e.g., graphite, [5] LiCoO 2 , [6] and TiS 2 [7]). Since the discovery of monolayer graphene in 2004, [8] more and more emerging 2D materials have quickly become popular electrode materials for various EES devices. This is not surprising given the unique structure and property of 2D materials. Their relatively large interlayer space allows fast ion (de)intercalation, whereas the highly anisotropic 2D structure enables fast charge transfer. Recently, a new class of 2D transition metal carbides, nitrides, and carbonitrides, known as MXenes, [9] was discovered and has attracted increasing research interest. Up to date, more than 30 MXenes have been successfully synthesized. [10] Similar to other 2D layered materials, MXenes also possess large/tunable interlayer spaces and high aspect ratios. In addition, MXenes show excellent hydrophilicity (contact angle is ≈21.5°-35°) [11] and extraordinary conductivity (e.g., ≈9880 S cm −1 for Ti 3 C 2 T x , 3250 ± 100 S cm −1 for V 2 CT x). [12] Further, MXenes are coupled with various terminations (e.g., OH, O, and F), which endow rich surface chemistries. These unique properties make them appealing in various applications, especially for energy storage devices such as batteries and supercapacitors. [1d,4i,13] We noted that there have already been several excellent reviews on the application of MXenes for energy storage and conversion, which cover a wide range of topics including for LIBs, supercapacitors, electrocatalysis, photocatalysis, electromagnetic interference, and so on. [10a,14] However, a more specific summary focuses on the rechargeable batteries is required and beneficial for the researchers working on nextgeneration batteries. Moreover, the study and investigation on MXenes for other EES systems beyond LIB are rapidly developing and have achieved great progress very recently. For example, great research efforts have been invested in exploring the application of MXenes in Li-sulfur batteries Research on next-generation battery technologies (beyond Li-ion batteries, or LIBs) has been accelerating over the past few years. A key challenge for these emerging batteries has been the lack of suitable electrode materials, which severely limits their further developments. MXenes, a new class of 2D transition metal carbides, carbonitrides, and nitrides, are proposed as electrode materials for these emerging batteries due to several desirable attributes. These attributes include large a...

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Conducting and Lithiophilic MXene/Graphene Framework for High-Capacity, Dendrite-Free Lithium–Metal Anodes

Cited by 170 publications

References 63 publications

Rational Design of Multifunctional Integrated Host Configuration with Lithiophilicity‐Sulfiphilicity toward High‐Performance Li–S Full Batteries

Rational Design of Multifunctional Integrated Host Configuration with Lithiophilicity‐Sulfiphilicity toward High‐Performance Li–S Full Batteries

Silicon Quantum Dots Induce Uniform Lithium Plating in a Sandwiched Metal Anode

MXenes for Rechargeable Batteries Beyond the Lithium‐Ion

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