刘勇   Associate professor

研究方向:功能纳米材料的设计合成及其在海水淡化、杀菌、能量储存方面的应用。承担项目:国家自然科学基金青年项目(24万) 山东省自然科学基金青年项目(15万) 青岛市原创探索项目(20万) 无锡新吴区“飞凤人才”(100万) 无锡“太湖人才”(100万)获奖情况:中国石油和化工科技进步三等奖论文情况:以第一作者或通讯作者发表高水平SCI论文30余篇,包括Adv. Funct. Mater.、ACS Nano...Detials

Bioinspired OH-BNNS/aramid fiber separator with high mechanical and temperature-tolerant properties for lithium metal batteries

Release time:2024-12-24  Hits:

  • Key Words:HEXAGONAL BORON-NITRIDE; ION BATTERIES; ANODE; EXFOLIATION; DEPOSITION; NANOTUBES
  • Abstract:Battery separator is considered as an important component to avoid direct contact between cathode and anode. The development of separators with high mechanical properties and excellent thermal stability remains a key challenge. Here, free-standing hydroxylated boron nitride nanosheet (OH-BNNS)/aramid nanofiber (ANF) nanocomposite separators with nacre-like structure were prepared by combining high modulus ANF with OH-BNNS through sol-gel conversion process. The OH-BNNS/ANF separator with 20 wt% OH-BNNS loading offers benefits of excellent mechanical properties (strength: 114.86 /- 3.47 MPa, modulus: 3.66 /- 0.29 GPa), high decomposition temperature (507.8 degrees C) as well as better electrolyte wettability (contact angle <5 degrees) compared with commercial polypropylene (PP) separator. A layered structure formed by the overlapped OH-BNNS and ANF contributes to constructing uniform lithium-ion transport channels and suppressing the growth of lithium dendrites. Meanwhile, even under the aging condition of 120 degrees C, the battery with 20 wt% OH-BNNS/ANF separator still maintains stable electrochemical performance and shows high thermal stability. As expected, the Li/lithium titanate (Li/LTO) battery using 20 wt% OH-BNNS/ANF as the separator achieves a capacity of 172.7 mAh g(-1) with a high discharge capacity retention of 96.5 % after 500 cycles, revealing the long-term cycle stability.
  • Volume:992
  • Issue:-
  • Translation or Not:no