FeNi-LDH Intercalation for Suppressing the Self-Discharge of the VB2-Air Battery

Fanqi Wang; Meifen Wu; Bobba V R Chowdari; Zhaoyin Wen

doi:10.1021/acsami.9b20119

FeNi-LDH Intercalation for Suppressing the Self-Discharge of the VB₂-Air Battery

ACS Appl Mater Interfaces. 2020 Feb 19;12(7):8219-8224. doi: 10.1021/acsami.9b20119. Epub 2020 Feb 7.

Authors

Fanqi Wang^{1

2}, Meifen Wu^{1

2}, Bobba V R Chowdari³, Zhaoyin Wen^{1

2}

Affiliations

¹ CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics , Chinese Academy of Sciences , Shanghai 200050 , P. R. China.
² Center of Materials Science and Optoelectronics Engineering , University of Chinese Academy of Sciences , Beijing 100049 , P. R. China.
³ School of Materials Science and Engineering , Nanyang Technological University , 639798 , Singapore.

PMID: 31994868
DOI: 10.1021/acsami.9b20119

Abstract

The VB₂-air battery is currently known for its highest theoretical specific capacity, up to 4060 mA h g^-1. This together with the excellent environmental compatibility and high security endues with promising application prospects for the battery. However, the self-discharge of the anode caused by hydrogen evolution corrosion results in a severe capacity loss during discharge. In this work, we studied the FeNi-LDH intercalation for suppressing the self-discharge of the VB₂-air battery. We adopt the vertical FeNi-LDH arrays to modify VB₂ particles. Hydroxyl ions participating in the discharge reaction are transported along adsorbed water molecules and hydroxide host layers through a rapid hydrogen bond formation and cleavage to the VB₂ surface, while the depolarizer hydrogen ions are isolated. The hydrogen evolution corrosion on the VB₂ anode is effectively suppressed. As a result, the discharge specific capacity of the battery is increased by 700 mA h g^-1.

Keywords: FeNi-LDH intercalation; suppress; the VB2−air battery; the hydrogen evolution corrosion; the self-discharge.