3D hierarchically porous NiO/Graphene hybrid paper anode for long-life and high rate cycling flexible Li-ion batteries

• 作者: Chuhong Zhang Hao Wen Ju Fu Ruoxin Yuan Tianbiao Zeng Wenbin Kang Xiaodong Guo
• 来源期刊: 能源化学
• 年，卷（期）: 2020,（8）
• 页码范围: 172-179
• 页数: 8页
• 语种: 英文

摘要

With the rapid emergence of wearable devices,flexible lithium-ion batteries (LIBs) are much more needed than ever.Free-standing graphene-based composite paper electrodes with various active materials have appealed wide applications in flexible LIBs.However,due to the prone-to-restacking feature of graphene layers,a long cycle life at high current densities is rather difficult to be achieved.Herein,a unique three-dimensional (3D) hierarchically porous NiO micro-flowers/graphene paper (fNiO/GP) electrode is successfully fabricated.The resulting fNiO/GP electrode shows superior long-term cycling stability at high rates (e.g.,storage capacity of 359 mAh/g after 600 cycles at a high current density of 1 A/g).The facile 3D porous structure combines both the advantages of the graphene that is highly conductive and flexible to ensure rapid electrons/ions transfer and buffer the volume expansion of NiO during charge/discharge,and of the micro-sized NiO flowers that induces hierarchical between-layer pores ranging from nanomicro meters to promote the penetration of the electrolyte and prevent the re-stacking of graphene layers.Such structural design will inspire future manufacture of a wide range of active materials/graphene composite electrodes for high performance flexible LIBs.