A Li+ and PANI co-intercalation strategy for hydrated V2O5 to enhance zinc ion storage performance. Issue 36 (2nd September 2022)

• Record Type: Journal Article
• Authors: He, Wei; Fan, Zixuan; Huang, Zequan; Liu, Xingyu; Qian, Jinchen; Ni, Meng; Zhang, Peigen; Hu, Linfeng; Sun, ZhengMing
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 36(2022)
• Page Start: 18962
• Page End: 18971
• Publication Date: 2022-09-02
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta03145k
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Li + and polyaniline (PANI) co-intercalated hydrated V2 O5 with an enlarged spacing of 14.4 Å is successfully synthesized as cathode materials for high performance zinc ion batteries. Abstract : Layered vanadium-based oxides are regarded as promising cathode materials for zinc-ion batteries (ZIBs) due to their open-framework crystal structure and high theoretical specific capacity. However, the sluggish Zn 2+ diffusion and poor structural stability limit their wide application in ZIBs. Herein, a new strategy is proposed to introduce metal ions and conjugated conductive polymers into layered hydrated V2 O5 as a cathode material for ZIBs. For demonstration, Li + and polyaniline (PANI) are co-intercalated into hydrated V2 O5 (LPVO) resulting in an enlarged spacing of 14.4 Å. A ZIB with this LPVO cathode exhibits a capacity of 377 mA h g −1 at a current density of 0.1 A g −1, which is higher than that of a single Li + pre-intercalated hydrated V2 O5 (LVO) or PANI pre-intercalated host (PVO). Besides, a long-term cycling stability (94% capacity retention after 800 cycles at 5 A g −1 ) is achieved. The synergistic effect of pre-intercalated Li + and PANI in LPVO originates from the weak electrostatic interactions between Zn 2+ and the host O 2− . Density functional theory (DFT) calculation results clearly show that LPVO possesses the lowest binding energy of 1.67 eV for Zn 2+ insertion into the host (2.41 eV for LVO, 1.84 eV for PVO), indicating favorable reaction kinetics in LPVO, which is also confirmed by the fastest Zn 2+ diffusion coefficient of LPVO among the three samples. The enlarged lattice space and stabilized host structure also improve the cycling performance. Our study elucidates the advantages of co-intercalated alien species in the host and provides a facile strategy to obtain high performance ZIBs.