Scalable fabrication of printed Zn//MnO2 planar micro-batteries with high volumetric energy density and exceptional safety

• 来源期刊: 国家科学评论（英文版）
• 关键词: low cost printed planar Zn//MnO2 micro-batteries metal-free current collectors
• 年，卷（期）: 2020,（1）
• 页码范围: 64-72
• 页数: 9页
• 语种: 英文
• DOI: 10.1093/nsr/nwz070

摘要

The rapid development of printed and microscale electronics imminently requires compatible micro-batteries (MBs) with high performance,applicable scalability,and exceptional safety,but faces great challenges from the ever-reported stacked geometry.Herein the first printed planar prototype of aqueous-based,high-safety Zn//MnO2 MBs,with outstanding performance,aesthetic diversity,flexibility and modularization,is demonstrated,based on interdigital patterns of Zn ink as anode and MnO2 ink as cathode,with high-conducting graphene ink as a metal-free current collector,fabricated by an industrially scalable screen-printing technique.The planar separator-free Zn//MnO2 MBs,tested in neutral aqueous electrolyte,deliver a high volumetric capacity of 19.3 mAh/cm3 (corresponding to 393 mAh/g) at 7.5 mA/cm3,and notable volumetric energy density of 17.3 mWh/cm3,outperforming lithium thin-film batteries (≤ 10 mWh/cm3).Furthermore,our Zn//MnO2 MBs present long-term cyclability having a high capacity retention of 83.9％ after 1300 cycles at 5 C,which is superior to stacked Zn//MnO2 batteries previously reported.Also,Zn//MnO2 planar MBs exhibit exceptional flexibility without observable capacity decay under serious deformation,and remarkably serial and parallel integration of constructing bipolar cells with high voltage and capacity output.Therefore,low-cost,environmentally benign Zn//MnO2 MBs with in-plane geometry possess huge potential as high-energy,safe,scalable and flexible microscale power sources for direction integration with printed electronics.