Mechanism of Storage and Capacity Attenuation of V2O5 as Cathode of Zinc-ion Battery

doi:10.7503/cjcu20200093

Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (8): 1859.doi: 10.7503/cjcu20200093

• Physical Chemistry • Previous Articles Next Articles

Mechanism of Storage and Capacity Attenuation of V₂O₅ as Cathode of Zinc-ion Battery

HUANG Yongfeng^1,2, HUANG Wenting^1,2, LIU Wenbao^1,2, LIU Yuefeng³, LIU Wei³, XU Chengjun¹

1. International Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China;
2. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;
3. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, China

Received:2020-02-24 Online:2020-08-10 Published:2020-05-09
Supported by:
Supported by the International Science & Technology Cooperation Program of China(No. 2016YFE0102200) and the Shenzhen Technical Plan Project, China(No. JCYJ20160301154114273).

Abstract

Abstract: In this paper, the vanadium(V₂O₅) was prepared by hydrothermal and then heat treatments and characterized by X-ray diffraction(XRD), spherical aberration corrected scanning transmission electron microscopy(STEM) and scanning electron microscopy(SEM). The results show that the prepared V₂O₅ grew preferentially and had good crystallinity. The V₂O₅ cathode material had a specific capacity of 340 mA·h/g at initial discharge at constant current of 0.5 A/g. The initial capacity of the battery was 170 mA·h/g at a constant discharge-charge current density of 5 A/g, which gradually decayed to 50 mA·h/g after 100 cycles. By subsequent analysis of the phase evolution of V₂O₅ cathode materials at different discharge states using XRD and STEM, it was revealed that the co-insertion(extraction) of zinc-ions and protons occured during the discharge-charge processes, and the amorphization of the positive electrode material during discharge-charge and the formation of by-product basic zinc sulfate lead to capacity attenuation of the battery system.

Key words: Zinc-ion battery, V₂O₅ cathode, Spherical aberration corrected scanning transmission electron microscopy(STEM), Capacity attenuation

CLC Number:

O646
O611.6

TrendMD:

HUANG Yongfeng, HUANG Wenting, LIU Wenbao, LIU Yuefeng, LIU Wei, XU Chengjun. Mechanism of Storage and Capacity Attenuation of V₂O₅ as Cathode of Zinc-ion Battery[J]. Chem. J. Chinese Universities, 2020, 41(8): 1859.

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Mechanism of Storage and Capacity Attenuation of V₂O₅ as Cathode of Zinc-ion Battery

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