Pengqian Guo,Pengfeng Jiang,Weixin Chen,Guoyu Qian,Deyan He,Xia Lu
Interfacial engineering plays an important role in dynamically stabilizing the electrochemical performance of lithium-sulfur batteries (LSBs). Constructing a robust interface, e.g., using a multifunctional membrane, benefits not only for the suppression of lithium polysulfides (LiPSs) shuttling, but also for the inhibition of uncontrollable Li dendrite growth. Herein, a bifunctional membrane is fabricated with the Al 2 O 3 nanoparticle-embedded polyacrylonitrile nanofibers (Al 2 O 3 /PAN) in a facile way as separator, which are found effective in blocking the growth of Li dendrite and the shuttling of LiPSs in LSBs. The exposed Al 2 O 3 nanoparticles work in a responsible way to physiochemically capture the LiPSs and simultaneously let the Li ions shuttle through the PAN nanofiber network as the simulation indicated. The 3D cross-linked membrane can also block the oriented Li deposition and growth to make the symmetric Li||Li cell cycle over 1500 h without short circuit at 0.5 mA cm −2 . Moreover, the LSB exhibits a reversible capacity of 2.08 mAh cm −2 at 500 mA g −1 under the sulfur loading of 3.6 mg cm −2 . These results provide a doable and economy way to fabricate the robust membrane to deal effectively with the tough issues, which sheds new light on the design and optimization of high-energy-density sulfur prevailed rechargeable batteries.
Youlan Zou,Yanhong He,Huiyao Li,Shiyan Deng,Wenhao Tang,Shuang Deng
In order to solve the problems of low ionic conductivity, low lithium-ion transference number and weak mechanical strength of PEO solid polymer electrolytes (SPEs), this paper proposes to prepare composite cross-linked network polymer electrolytes (PEO-AAEM) through UV crosslinked polymerization of allyl acetoacetate (AAEM) and N- N -methylene diacrylamide (MBA) within the PEO SPEs. The amide group within the cross-linked network facilitates the dissociation of Li + , while the carbonyl group serves as a conduit for Li + transport. The PEO-AAEM SPEs exhibit the ionic conductivity of 5.4×10 −4 S cm −1 , with a lithium-ion transference number of 0.54 at 60 °C. The assembled Li//Li battery with proper AAEM content can be stably cycled for 2000 h at 0.2 mA cm −2 current, and LiFePO 4 //Li battery maintains a reversible capacity of 100 mA h g −1 after 500 cycles at 0.2C. This work offers a viable pathway for developing SPEs with improved electrochemical performance for all solid-state lithium metal batteries (ASSLMBs).
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