Chemically Binding Scaffolded Anodes with 3D Graphene Architectures Realizing Fast and Stable Lithium Storage

Abstract

<jats:p>Three-dimensional (3D) graphene has emerged as an ideal platform to hybridize with electrochemically active materials for improved performances. However, for lithium storage, current anodic guests often exist in the form of nanoparticles, physically attached to graphene hosts, and therefore tend to detach from graphene matrices and aggregate into large congeries, causing considerable capacity fading upon repeated cycling. Herein, we develop a facile double-network hydrogel-enabled methodology for chemically binding anodic scaffolds with 3D graphene architectures. Taking tin-based alloy anodes as an example, the double-network hydrogel, containing interpenetrated cyano-bridged coordination polymer hydrogel and graphene oxide hydrogel, is directly converted to a physical-intertwined and chemical-bonded Sn−Ni alloy scaffold and graphene architecture (Sn−Ni/G) dual framework. The unique dual framework structure, with remarkable structural stability and charge-transport capability, enables the Sn−Ni/G anode to exhibit long-term cyclic life (701 mA h g<jats:sup>−1</jats:sup> after 200 cycles at 0.1 A g<jats:sup>−1</jats:sup>) and high rate performance (497 and 390 mA h g<jats:sup>−1</jats:sup> at 1 and 2 A g<jats:sup>−1</jats:sup>, respectively). This work provides a new perspective towards chemically binding scaffolded low-cost electrode and electrocatalyst materials with 3D graphene architectures for boosting energy storage and conversion.</jats:p>

3D Shapeable, Superior Electrically Conductive Cellulose Nanofibers/Ti 3 C 2 T x MXene Aerogels/Epoxy Nanocomposites for Promising EMI Shielding

“…In the wide-scan XPS spectra ( Figure S1(b)), the Al 2s and Al 2p peaks of Ti 3 AlC 2 disappear after etching, while the new peaks of O 1s and F 1s are observed in Ti 3 C 2 T x [39], confirming the complete removal of Al atomic layer and the formation of -OH and -F groups on the surface of Ti 3 C 2 T x nanosheets. In Figure S1(d), the absorption peaks at 3460, 1630, and 600 cm -1 of Ti 3 C 2 T x nanosheets are ascribed to the stretching vibration from -OH, C=O, and Ti-O groups, respectively [40,41]. In contrast to the dense-layered structures of Ti 3 AlC 2 raw material in Figure 2(b) and Figure S1(a), after etching, Ti 3 C 2 T x nanosheets exhibit typical 2D structure with uniform thickness and a lateral size of about 800 nm, as shown in Figure 2(c).…”

A Ternary Hybrid‐Cation Room‐Temperature Liquid Metal Battery and Interfacial Selection Mechanism Study

“…Although lithium‐ion anodes, such as graphite and Li 4 Ti 5 O 12 , have offered safer choices of alternative anodes with sacrificed energy density, the everincreasing demand for higher‐energy‐density batteries stimulated the revival of research on Li metal anodes. [ 1–5 ] Up to now, many strategies have been proposed, including uniformizing the current, stabilizing the solid electrolyte interphase (SEI), releasing the mechanical stress on electrodes, etc., to eliminate the danger of dendrite and the successive problems like continuous electrolyte/Li consumption. [ 6–13 ] Not only the intrinsic properties make the use of Li metal a problem, there is growing concern about Li storage in the future considering the rapid growth of the electric vehicle market and the uneven distribution of Li resources.…”

Temperature-Dependent Mechanical Properties of Graphene/Cu Nanocomposites with In-Plane Negative Poisson’s Ratios

“…Once the effective thickness is determined by MD simulations, the effective Young's modulus and shear modulus of the graphene sheet can be obtained uniquely from Equations (3) to (6). The TECs at different temperatures can also be obtained from the relaxation process.…”

“…Then, the density of the graphene can be obtained, which is 4717 kg/m 3 . Finally, the effective moduli of graphene can also be obtained based on Equations (3)- (6). Table 4 presents the elastic moduli E 11 and E 22 as well as the shear modulus G 12 for the graphene sheet.…”

“…Graphene is an ideal reinforcement agent for highperformance composites due to its superb mechanical and physicochemical properties [1][2][3][4][5][6]. Recently, polymer-and metal-based composites [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] reinforced by graphene have gained tremendous attention from the scientific community.…”