三维石墨烯负载CuCo2O4微米花应用于锂空气电池

A high-performance cathode of three-dimensional graphene@CuCo2O4 microflower for Li-O2 batteries

为了缓解能源的日益短缺,减少环境污染,开发具有高性能和低成本的锂空气电池正极材料成为当前亟待解决的问题。采用化学气相沉积法和水热法在泡沫镍基底上合成了三维石墨烯和CuCo2O4微米花复合材料,该材料具有独特的分层多孔结构,为O2 和放电产物提供了充足的输运和储存空间。以三维石墨烯和钴酸铜微米花复合材料为正极的锂空气电池,在电流密度为100 mA/g的条件下,放电比容量达到了3 278 mAh/g。限制充放电比容量为500 mAh/g时,电池在电压稳定情况下充放电循环169次,并且首次充电平台低至3.6 V。

In order to solve the shortage of energy and reduce environmental pollution, it is urgent to develop Li-O2 batteries driving by cost-efficient and high-performance cathode materials. Herein, the composite material of CuCo2O4 microflower on the three-dimensional graphene coated on the Ni foams substrate was prepared by the combination of chemical vapor deposition and hydrothermal method. The cathode has a unique hierarchical porous structure, which could provide enough space for O2 transport and discharge product storage. The discharge specific capacity of the Li-O2 battery with the cathode reach 3 278 mAh/g at a current density of 100 mA/g. In addition, the battery can sustain 169 stable cycles at 100 mA/g with a limited charge/discharge capacity of 500 mAh/g. Notably, the charging platformwas as low as 3.6 V for the first circle.