Electrochemical properties and facile preparation of hollow porous V2O5 microspheres for lithium-ion batteries

Lichun Xue; Yueqing Li; Wentao Lin; Feiming Chen; Guichan Chen; Dengjie Chen

doi:10.1016/j.jcis.2023.01.131

Electrochemical properties and facile preparation of hollow porous V₂O₅ microspheres for lithium-ion batteries

J Colloid Interface Sci. 2023 May 15:638:231-241. doi: 10.1016/j.jcis.2023.01.131. Epub 2023 Feb 1.

Authors

Lichun Xue¹, Yueqing Li¹, Wentao Lin¹, Feiming Chen², Guichan Chen¹, Dengjie Chen³

Affiliations

¹ College of Chemistry and Materials Science, Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Guangdong Engineering & Technology Research Centre of Graphene-Like Materials and Products, Jinan University, Guangzhou 510632, China.
² Guangdong Yunfu Vocational College of Chinese Medicine, Yunfu 527400, China.
³ College of Chemistry and Materials Science, Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Guangdong Engineering & Technology Research Centre of Graphene-Like Materials and Products, Jinan University, Guangzhou 510632, China. Electronic address: dengjie.chen@jnu.edu.cn.

PMID: 36738546
DOI: 10.1016/j.jcis.2023.01.131

Abstract

Vanadium pentoxide (V₂O₅) has shown great potential to be used in lithium-ion batteries (LIBs), but it has limited applications because it has cycle instability and poor rate capability, and its lithiation mechanism is not well understood. In this work, hollow porous V₂O₅ microspheres (HPVOM) were obtained by a facile poly(vinylpyrrolidone) and ethylene glycol-assisted soft-template solvothermal method. Half cells with HPVOM exhibited good capacity, rate capability, and stability, delivering 407.9 mAh g^-1 at 1.0 A g^-1 after 700 cycles. Furthermore, a LiFePO₄/HPVOM full cell had a discharge capacity of 109.9 mAh g^-1 after 150 cycles at 0.1 A g^-1. Using an equivalent circuit model (ECM) and distribution of relaxation times (DRT), we found that the charge-transfer (including the solid-state interface resistance) and bulk resistances varied regularly with the charge/discharge state, while the electrolyte resistance was largely maintained. The bulk resistance finally vanished, indicative of dynamic activation. The method used to prepare the hollow microspheres, as well as the display of electrode kinetics via ECM and DRT, could be broadly applied in developing efficient electrodes for LIBs.

Keywords: Distribution of relaxation times; Electrochemical impedance spectroscopy; Electrode kinetics; Equivalent circuit model; V(2)O(5) hollow microspheres.

MeSH terms

Body Fluids*
Ions
Lithium*
Microspheres
Porosity

Substances

Lithium
Ions