Flower-like carbon-confined disordered rock-salt LiVO 2 anode with a sandwich structure for fast charging and stable lithium storage

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability
• Main Authors: Shen, Sicong, Sun, Bing, Bai, Xiaomeng, Yang, Song, Zhang, Dongmei, Pei, Cunyuan, Li, Pengju, Ni, Shibing
• Format: Journal Article
• Language: English
• Published: 2024
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/D4TA05076B

Disordered rock-salt (DRS) LiVO 2 has attracted enormous attention for use as a fast-charging anode due to its high Li + diffusion efficiency. However, sluggish interfacial kinetics hinder the electrochemical performance despite LiVO 2 having rapid bulk-phase transport dynamics. Herein, we design flower-like N-doped carbon-confined LiVO 2 with a sandwich structure (LiVO 2 /NC NFs) through an in situ grafting approach using polyacrylonitrile (PAN) as a template. Part of the cyano groups of PAN was hydrolyzed into carboxylate ions, promoting strong adhesion between the PAN and LiVO 2 precursors due to electrostatic interactions, thus ensuring the DRS structure and a continuous charge-transfer pathway for the LiVO 2 /NC NF electrode. The obtained LiVO 2 /NC heterointerface provides abundant active sites and enhances the interfacial transport kinetics of the ions. As a result, the LiVO 2 /NC NFs electrode exhibits excellent electrochemical performances (including an average discharge capacity of 415 mA h g −1 at 8.0 A g −1 after 4 periodic rate tests over 250 cycles, and a discharge capacity of 223 mA h g −1 at a high discharge current of 10.0 A g −1 after 5000 cycles), outperforming other LiVO 2 -based anodes. It is hoped that the design strategy of LiVO 2 /NC NFs will provide impetus for further development of fast-charging electrodes.