3D V2CTx-rGO Architectures with Optimized Ion Transport Channels toward Fast Lithium-Ion Storage

Pengjun Zhang; Changda Wang; Shiqiang Wei; Hongwei Shou; Kefu Zhu; Yuyang Cao; Wenjie Xu; Xin Guo; Xiaojun Wu; Shuangming Chen; Li Song

doi:10.1021/acsami.1c19596

3D V₂CT_x-rGO Architectures with Optimized Ion Transport Channels toward Fast Lithium-Ion Storage

ACS Appl Mater Interfaces. 2021 Dec 29;13(51):61258-61266. doi: 10.1021/acsami.1c19596. Epub 2021 Dec 16.

Authors

Pengjun Zhang¹, Changda Wang¹, Shiqiang Wei¹, Hongwei Shou^{1

2}, Kefu Zhu¹, Yuyang Cao¹, Wenjie Xu¹, Xin Guo¹, Xiaojun Wu², Shuangming Chen¹, Li Song¹

Affiliations

¹ National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui 230029, P. R. China.
² School of Chemistry and Material Sciences, University of Science and Technology of China, Hefei, Anhui 230029, P. R. China.

PMID: 34913669
DOI: 10.1021/acsami.1c19596

Abstract

Two-dimensional (2D) MXene materials show great potential in energy storage devices. However, the self-restacking of MXene nanosheets and the sluggish lithium-ion (Li⁺) kinetics greatly hinder their rate capability and cycling stability. Herein, we interlink 2D V₂CT_x MXene nanosheets with rGO to construct a 3D porous V₂CT_x-rGO composite. X-ray spectroscopy study reveals the close interfacial contact between V₂CT_x and rGO via electron transfer from V to C atoms. Benefiting from the close combination and optimized ion transport channel, V₂CT_x-rGO offers a high-rate Li⁺ storage performance and excellent cycling stability over 2000 cycles with negligible capacity attenuation. Moreover, it exhibits a dominant mechanism of intercalation pseudocapacitance and efficient Li⁺ transport proved by density functional theory calculation. This rationally designed 3D V₂CT_x-rGO has implications for the study of the MXene composite's structure and energy storage devices with high rate and stability.

Keywords: 3D architecture; V2CTx MXene; XAFS; fast ion transport; lithium-ion storage.