Enhanced Lithium Storage Performance of Liquid‐Phase Exfoliated Graphene Supported WS₂ Heterojunctions

Abstract

To improve the electrical conductivity and the cycling stability of layered transition metal disulfides (TMDs) as lithium‐ion battery anode, graphene@WS2 heterojunction composites are prepared by a facile one‐pot process, involving liquid‐phase exfoliation of graphene in N‐methylpyrrolidone, followed by in‐situ growth of WS2 in the graphene dispersion induced by a microwave‐assisted solvothermal method. The liquid‐phase exfoliated graphene (LEGr) with exceptional atomic structure not only serves as a substrate to couple WS2, but also serves as a mini‐current collector for the rapid transport of electrons within the anode. The LEGr‐based heterojunction WS2 composites exhibit improved lithium storage performance compared to the counterpart based on graphene oxide (GO), including higher lithium storage capacity, superior rate capability and outstanding cycling stability. This protocol enables processing and construction of advanced TMD heterojunction electrodes based on LEGr using an economical pathway.

Wearable supercapacitor based on polyaniline supported by graphene coated polyester textile

“…The D band (1356 cm −1 ) and G band (1580 cm −1 ) in GPT correspond to vibrations in the sp 3 ‐ and sp 2 ‐bonded carbon atoms, respectively 40 . The intensity ratio of D vs G bands (I D /I G ) was calculated as 0.46, which was less than that of RGO 36 . This suggested the high quality of the LPE produced graphene.…”

“…In order to investigate the structure of graphene nanosheets coating on polyester textile, XRD was performed on graphene, PT, and GPT (Figure 2A). In graphene, a typical diffraction peak at 26.60° can be detected, which corresponds to the (002) crystal plane of graphene 36 . After coating graphene on PT, the diffraction peak of PT at 25.90° shifted to 26.60° in GPT.…”

“…In graphene, a typical diffraction peak at 26.60 can be detected, which corresponds to the (002) crystal plane of graphene. 36 After coating graphene on PT, the diffraction peak of PT at 25.90 shifted to 26.60 in GPT. Therefore, the PT was fully coated by graphene, which means the produced GPT electrode can work as flexible and conductive substrate for the deposition of PANI.…”

“…40 The intensity ratio of D vs G bands (I D /I G ) was calculated as 0.46, which was less than that of RGO. 36 This suggested the high quality of the LPE produced graphene. The Raman spectrum of PANI/GPT showed a series of peaks characteristic of PANI.…”

Embedded Double One‐Dimensional Composites of WO3@N‐Doped Carbon Nanofibers for Superior and Stabilized Lithium Storage

“…Lithium-ion batteries (LIBs) have become the mainstay of energy storage devices due to their high energy density, excellent cycling performance, flexible and lightweight design. [1][2][3][4][5] It is precisely because of the above characteristics that LIBs are widely used in many fields, such as hybrid electrical vehicles, grid-scale batteries, new power-intensive devices, smart grid and so on. [6][7][8][9][10][11] The choice of anode material plays an important role in improving the performance of lithium-ion batteries.…”