阳极
材料科学
电解质
分离器(采油)
化学工程
聚偏氟乙烯
锂(药物)
离子电导率
氟化锂
阴极
聚合物
复合材料
无机化学
电极
电气工程
化学
物理
工程类
内分泌学
物理化学
热力学
医学
作者
Ziqiang Liu,Xiao Fu,Zhendong Li,Dingcheng Guo,Zhé Peng,Ruijuan Xiao,Xiayin Yao
标识
DOI:10.1016/j.ensm.2024.103201
摘要
Lithium metal anode has attracted increasing attention due to its ultra-high theoretical specific capacity and low redox potential. However, the severe interface problems caused by the parasitic reactions at the anode/separator interface greatly hinder its applications. Herein we design a 3D lithium−boron (LiB) fiber integrated lithium anode with polypropylene separator through the interfacial adhesive strategy with poly(vinylidene fluoride-co-hexafluoropropylene)-based polymer electrolyte. The 3D Li/LiB anode after chemical etching can increase the exchange current density to 36.8 mA cm−2, which is about 14 times the value of the pristine anode with 2.6 mA cm−2. Meanwhile, the poly(vinylidene fluoride-co-hexafluoropropylene)-based polymer electrolyte ensures high ionic conductivity and interfacial stability. Thus, the integrated anode with 3D electron/ion conductive network can guide Li deposition away from the unsafe anode/separator interface, and directly suppress the growth of lithium dendrites. As a result, the integrated anode with LiNi0.83Mn0.06Co0.11O2 cathode exhibits an excellent discharge capacity of 168.3 mAh g −1 at a high current density of 5 C. Besides, the rigid LiB skeleton coupling with flexible PVDF-HFP-based polymer electrolyte can effectively prevent the pulverization of lithium anode during long-term cycling, showing superior cycling stability of 1000 cycles at 1 C with a capacity retention of 76 %. This work provides a promising integrated anode for stable lithium metal batteries without lithium dendrite growth.
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