Xu Huailiang, Jin Hongchang, Qi Zhikai, Guo Yue, Wang Jinxi, Zhu Yanwu, Ji Hengxing
Hefei National Laboratory for Physical Sciences at the Microscale, Department of Applied Chemistry, CAS Key Laboratory of Materials for Energy Conversion, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), University of Science and Technology of China. Hefei 230026, People's Republic of China.
Nanotechnology. 2020 May 15;31(20):205710. doi: 10.1088/1361-6528/ab72ba. Epub 2020 Feb 4.
When used as a current collector, aluminum foil (AF) is vulnerable to local anodic corrosion during the charge/discharge process, which can lead to the deterioration of lithium-ion batteries (LIBs). Herein, a graphene foil (GF) with high electrical conductivity (∼5800 S cm) and low mass density (1.80 g cm) was prepared by reduction of graphene oxide foil with ultra-high temperature (2800 °C) annealing, and it exhibited significantly anodic corrosion resistance when serving as a current collector. Moreover, a LiNiCoMnO (NCM523) cathode using GF as a current collector (NCM523/GF) demonstrated a gravimetric capacity of 137.3 mAh g at 0.5 C based on the mass of the whole electrode consisting of the active material, carbon black, binder, and the current collector, which is 44.5% higher than that of the NCM523/AF electrode. Furthermore, the NCM523/GF electrode retains higher capacity at relatively faster rates, from 0.1 C to 5.0 C. Therefore, GF, a lightweight corrosion-resistant current collector, is expected to replace the current commercial metal current collectors in LIBs and to achieve high energy-density batteries.
当用作集流体时，铝箔（AF）在充电/放电过程中易受局部阳极腐蚀，这会导致锂离子电池（LIBs）性能恶化。在此，通过对氧化石墨烯箔进行超高温（2800℃）退火还原制备了具有高电导率（约5800 S/cm）和低质量密度（1.80 g/cm）的石墨烯箔（GF），其在用作集流体时表现出显著的抗阳极腐蚀性。此外，以GF作为集流体的LiNiCoMnO（NCM523）正极（NCM523/GF）基于由活性材料、炭黑、粘结剂和集流体组成的整个电极的质量，在0.5 C下的重量容量为137.3 mAh/g，比NCM523/AF电极高44.5%。此外，NCM523/GF电极在从0.1 C到5.0 C的相对较快速率下保持较高的容量。因此，GF这种轻质耐腐蚀的集流体有望取代LIBs中现有的商用金属集流体，并实现高能量密度电池。
