College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, China.
International Center for Materials Nanoarchitectonics, National Institute for Materials Science , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
Nano Lett. 2017 Jun 14;17(6):3543-3549. doi: 10.1021/acs.nanolett.7b00623. Epub 2017 May 30.
Increasing interest has recently been devoted to developing small, rapid, and portable electronic devices; thus, it is becoming critically important to provide matching light and flexible energy-storage systems to power them. To this end, compared with the inevitable drawbacks of being bulky, heavy, and rigid for traditional planar sandwiched structures, linear fiber-shaped lithium-ion batteries (LIB) have become increasingly important owing to their combined superiorities of miniaturization, adaptability, and weavability, the progress of which being heavily dependent on the development of new fiber-shaped electrodes. Here, we report a novel fiber battery electrode based on the most widely used LIB material, titanium oxide, which is processed into two-dimensional nanosheets and assembled into a macroscopic fiber by a scalable wet-spinning process. The titania sheets are regularly stacked and conformally hybridized in situ with reduced graphene oxide (rGO), thereby serving as efficient current collectors, which endows the novel fiber electrode with excellent integrated mechanical properties combined with superior battery performances in terms of linear densities, rate capabilities, and cyclic behaviors. The present study clearly demonstrates a new material-design paradigm toward novel fiber electrodes by assembling metal oxide nanosheets into an ordered macroscopic structure, which would represent the most-promising solution to advanced flexible energy-storage systems.
最近，人们越来越关注开发小型、快速和便携式电子设备；因此，为它们提供匹配的轻便灵活的储能系统变得至关重要。为此，与传统平面夹层结构不可避免的体积大、重量大和刚性的缺点相比，线性纤维状锂离子电池（LIB）因其小型化、适应性和可编织性的综合优势而变得越来越重要，其进展在很大程度上取决于新型纤维状电极的发展。在这里，我们报告了一种基于最广泛使用的 LIB 材料-氧化钛的新型纤维电池电极，它通过可扩展的湿法纺丝工艺被加工成二维纳米片并组装成宏观纤维。氧化钛片在原位规则堆叠并与还原氧化石墨烯（rGO）共形杂交，从而充当高效的集流器，使新型纤维电极具有出色的集成机械性能，并具有优异的电池性能，包括线密度、倍率性能和循环性能。本研究通过将金属氧化物纳米片组装成有序的宏观结构，为新型纤维电极的材料设计提供了一个新的范例，这将是先进的柔性储能系统最有前途的解决方案。
