Synthesis and Electrochemical Performance of V[sub.6]O[sub.13] Nanosheets Film Cathodes for LIBs

• Published in: Materials Vol. 15; no. 23
• Main Authors: Li, Fei, Xu, Haiyan, Liu, Fanglin, Li, Dongcai, Wang, Aiguo, Sun, Daosheng
• Format: Journal Article
• Language: English
• Published: MDPI AG 01.12.2022
• Subjects: Crystals; Electrochemistry; Structure
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma15238574

V[sub.6]O[sub.13] thin films were deposited on indium-doped tin oxide (ITO) conductive glass by a concise low-temperature liquid-phase deposition method and through heat treatment. The obtained films were directly used as electrodes without adding any other media. The results indicate that the film annealed at 400 °C exhibited an excellent cycling performance, which remained at 82.7% of capacity after 100 cycles. The film annealed at 400 °C with diffusion coefficients of 6.08 × 10[sup.−12] cm[sup.2]·s[sup.−1] (Li[sup.+] insertion) and 5.46 × 10[sup.−12] cm[sup.2]·s[sup.−1] (Li[sup.+] extraction) in the V[sub.6]O[sub.13] film electrode. The high diffusion coefficients could be ascribed to the porous morphology composed of ultrathin nanosheets. Moreover, the film endured phase transitions during electrochemical cycling, the V[sub.6]O[sub.13] partially transformed to Li[sub.0.6]V[sub.1.67]O[sub.3.67], Li[sub.3]VO[sub.4], and VO[sub.2] with the insertion of Li[sup.+] into the lattice, and Li[sub.0.6]V[sub.1.67]O[sub.3.67], Li[sub.3]VO[sub.4], and VO[sub.2] partially reversibly transformed backwards to V[sub.6]O[sub.13] with the extraction of Li[sup.+] from the lattice. The phase transition can be attributed to the unique structure and morphology with enough active sites and ions diffusion channels during cycles. Such findings reveal a bright idea to prepare high-performance cathode materials for LIBs.