Wang Fanqi, Wu Meifen, Chowdari Bobba V R, Wen Zhaoyin
CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics , Chinese Academy of Sciences , Shanghai 200050 , P. R. China.
Center of Materials Science and Optoelectronics Engineering , University of Chinese Academy of Sciences , Beijing 100049 , P. R. China.
ACS Appl Mater Interfaces. 2020 Feb 19;12(7):8219-8224. doi: 10.1021/acsami.9b20119. Epub 2020 Feb 7.
The VB-air battery is currently known for its highest theoretical specific capacity, up to 4060 mA h g. 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 VB-air battery. We adopt the vertical FeNi-LDH arrays to modify VB 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 VB surface, while the depolarizer hydrogen ions are isolated. The hydrogen evolution corrosion on the VB anode is effectively suppressed. As a result, the discharge specific capacity of the battery is increased by 700 mA h g.
VB空气电池目前以其高达4060 mA h g的最高理论比容量而闻名。这与优异的环境兼容性和高安全性相结合，赋予了该电池广阔的应用前景。然而，析氢腐蚀导致的阳极自放电会在放电过程中造成严重的容量损失。在这项工作中，我们研究了FeNi-LDH插层以抑制VB空气电池的自放电。我们采用垂直FeNi-LDH阵列修饰VB颗粒。参与放电反应的氢氧根离子通过快速形成和断裂氢键沿着吸附的水分子和氢氧化物主体层传输到VB表面，同时去极化剂氢离子被隔离。VB阳极上的析氢腐蚀得到有效抑制。结果，电池的放电比容量提高了700 mA h g。
