摘要
Sub-1 nm nanowires(SNWs) can not only be processed like polymers due to their polymer-analogue properties but also show multifunctions owing to their well-manipulated compositions and structures. Rationally designed and engineered multicomponent heterostructure SNWs can further enhance their multifunction performance while it is very challenging to achieve such SNWs at sub-nanoscale.Herein, we synthesized Bi_(2)O_(3)-polyoxometalate heterostructure SNWs(PMB SNWs), and fabricated super-aligned PMB SNWs films(S-PMB SNWs films), which can serve as interlayers to efficiently suppress lithium polysulfide(LPS)shuttling, intrinsically promote the redox kinetics of the LPS conversion and substantially protect the Li anode. The lithium-sulfur(Li-S) battery with the S-PMB SNWs film as the interlayer showcases an ultralow capacity decay rate with 0.013% per cycle over 850 cycles. This study demonstrates the potential of heterostructure SNWs to improve the performance of Li-S batteries.
亚纳米线(SNWs)具有类高分子的性质,可以像高分子一样进行加工,而且其组成和结构易于调控,具有丰富的功能.合理设计多组分异质结构SNWs可以进一步提高其功能性,然而目前合成这种SNWs仍然面临着巨大的挑战.本文合成了Bi_(2)O_(3)-多酸异质结构SNWs(PMB SNWs),并制备了超顺排的PMB SNWs薄膜(S-PMB SNWs薄膜),该薄膜可以作为中间层,有效抑制多硫化锂(LPSs)的穿梭,从本质上促进LPSs氧化还原转化动力学,并对锂阳极起到保护作用.以S-PMB SNWs膜作为中间层的锂硫(Li-S)电池在850次循环中表现出超低的容量衰减率,每循环一圈只衰减0.013%.本研究证明了这种异质结构的SNWs具有改善锂硫电池性能的潜力.
作者
Simin Zhang
Haodong Shi
Junwang Tang
Wenxiong Shi
Zhong-Shuai Wu
Xun Wang
张思敏;石浩东;唐军旺;匙文雄;吴忠帅;王训(Key Lab of Organic Optoelectronics and Molecular Engineering,Department of Chemistry,Tsinghua University,Beijing 100084,China;State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China;Dalian National Laboratory for Clean Energy(DNL),Chinese Academy of Sciences(CAS),Dalian 116023,China;University of Chinese Academy of Sciences,Beijing 100049,China;Department of Chemical Engineering,University College London(UCL),WC1E 7JE London,United Kingdom;Institute for New Energy Materials and Low Carbon Technologies,School of Materials Science and Engineering,Tianjin University of Technology,Tianjin 300387,China)
基金
supported by the Ministry of Science and Technology of China (2017YFA0700101, 2016YFA0202801 and 2016YBF0100100)
China Postdoctoral Science Foundation funded project (2020TQ0164)
the Shuimu Tsinghua Scholar Program
the National Natural Science Foundation of China (22035004, 51872283 and 21805273)
Liaoning Bai Qian Wan Talents Program
Liaoning Revitalization Talents Program (XLYC1807153)
Dalian Institute of Chemical Physics (DICP ZZBS201708, DICP ZZBS201802 and DICP I202032)
DICP&QIBEBT (DICP&QIBEBT UN201702)
Dalian National Laboratory For Clean Energy (DNL) Cooperation Fund
CAS (DNL180310, DNL180308, DNL201912 and DNL201915)。
