Organic-inorganic interlayer enabling the stability of PVDF-HFP modified Li metal for lithium-oxygen batteries

作者：Yuan, Dong; Ji, Chenhao; Zhuge, Xiangqun; Chai, Aohua; Pan, Liaoting; Li, Yibing; Luo, Zhihong^*; Luo, Kun^*

来源：Applied Surface Science, 2023, 613: 155863.

DOI：10.1016/j.apsusc.2022.155863

• PVDF-HFP
• Organic-inorganic interlayer
• SEI
• Li metal
• Li-oxygen battery

PVDF-HFP layer has been used in lithium (Li) metal-based batteries for its high Li-ion conductivity, excellent mechanical strength and water-proof property. Moreover, the layer reacts with Li metal and improves the per-formance of solid electrolyte interphase (SEI) by introducing the additional component of LiF. Herein, we further allow an organic molecular (11-mercaptoundecanoic acid, MUA) to involve in the reaction between the PVDF-HFP layer and Li metal, which results in an organic-inorganic SEI interlayer consisting of Li2S, LiF, lithium alkyl carbonate (RCOOLi), and MUA-Li etc. This interlayer shows the high Li+ transfer number (0.62) and Young's modulus (6.17 GPa), which also serves to increase the adhesion between PVDF-HFP and Li metal. By using the organic-inorganic interlayer enhanced PVDF-HFP coated Li metal, the Li/Li symmetric cells can run for at least 2190 h steadily, and the Li-oxygen batteries can operate for 214 cycles, demonstrating the improved protection and ionic conductivity of Li metal anodes.

• 单位
  桂林理工大学; 常州大学