3D打印自支撑ZnSe/NC电极用于锂离子微型电池

A 3D printed freestanding ZnSe/NC anode for Li-ion microbatteries

近年来,微/纳米制造和集成微系统的快速发展受到越来越多的关注,因此对微型储能器件(MESDs),尤其是商业化的微型电池提出了更高的需求。锂离子微型电池(LIMBs)是研究最多的微型储能器件,但较低的负载和有待提高的能量密度仍阻碍了其进一步的应用。在此,通过基于挤出式的墨水直写和相应的后处理,设计并制备了3D打印的氮掺杂碳包覆硒化锌(ZnSe)纳米颗粒的复合电极。高容量的ZnSe纳米颗粒被限制在氮掺杂的碳中,其中氮掺杂的碳不仅能增强电导率,还可以充当缓冲层以减轻纳米材料的体积膨胀,并为电化学反应提供额外的活性位点。此外,3D打印电极的互连设计有利于快速传质和离子传输。因此,通过直接墨水书写的自支撑3D打印电极实现了3.15 mg cm^(−2)的高负载量,在锂离子微型电池中表现出优异的能量密度和良好的可逆性。该工作为设计高性能电极和高负载量电极提供新的思路与策略,有望构建优异的微型储能器件。

The rapid development of micro/nanomanufactured integrated microsystems in recent years requires high performance micro energy storage devices(MESDs).Li-ion microbatteries(LIMBs)are the most studied MESDs,but the low mass loading of active materials and the less-than-perfect energy density hinder their further application.A 3D printed ZnSe/N-doped carbon(ZnSe/NC)composite electrode was designed and fabricated by extrusion-based 3D printing and a post-treatment strategy for use as the anode of LIMBs.The high capacity ZnSe nanoparticles are confined in the NC,where the NC not only improves the conductivity but also acts as a buffer layer to reduce the volume expansion and provide additional active sites for electrochemical reactions.The interconnec-ted design of the 3D printed electrode is good for fast mass transfer and ion transport.A freestanding 3D printed ZnSe/NC electrode with a high mass loading of 3.15 mg cm^(−2) was achieved by direct ink printing,which had a superior energy density and decent reversibility in high-power LIMBs.This strategy can be used for other high-performance electrodes to achieve a high-mass-loading of active materials for microbatteries,opening up a new way to construct advanced MESDs.