Ultrafine VN quantum nanodots anchored in three-dimensional porous N-doped carbon with excellent pseudocapacitive behaviour for high rate lithium-ion batteries

Abstract

Vanadium nitride (VN) is an attractive anode material for lithium-ion batteries (LIBs) due to its large theoretical capacity and excellent electrical conductivity; however, its low rate performance and poor cycle life caused by slow reaction kinetics and large volume changes have limited its practical application. Herein, in situ formation of VN quantum nanodots (VNQDs) anchored on a three-dimensional porous N-doped carbon (PNC) skeleton was achieved by a simple and scalable template-assisted and heat treatment strategy to build porous VNQDs@PNC composites as pseudocapacitive anode materials for LIBs. The resulting composites provide abundant active sites (uniform distribution of VNQDs), excellent electrical conductivity (N-doped carbon) and a shortened ion diffusion channel. The pseudo-capacitive controlled behaviour accelerates the fast lithium intercalation and delithiation process. As a result, the VNQDs@PNC-3 anode materials exhibit high lithium-ion storage capacities (687.3 mA h g−1 under 100 mA g−1), excellent rate performance (239 mA h g−1 at 15 A g−1), and long-term stability (372.1 mA h g−1 at 2 A g−1 with a capacity retention of 80.06% over 3000 cycles). When coupled with a LiFePO4 (LFP) cathode, the full battery exhibits a large capacity of 63.4 mA h g−1 over 5000 cycles at 0.5 A g−1. This work further verifies the feasibility of kinetics-compatible electrode material design strategies toward high rate LIBs.

Graphical abstract: Ultrafine VN quantum nanodots anchored in three-dimensional porous N-doped carbon with excellent pseudocapacitive behaviour for high rate lithium-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
28 Jun 2024
Accepted
27 Aug 2024
First published
28 Aug 2024

New J. Chem., 2024, Advance Article

Ultrafine VN quantum nanodots anchored in three-dimensional porous N-doped carbon with excellent pseudocapacitive behaviour for high rate lithium-ion batteries

D. Wang, Y. Gao, Z. Guo and Z. Wang, New J. Chem., 2024, Advance Article , DOI: 10.1039/D4NJ02950J

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