Functionalized 12 µm Polyethylene Separator to Realize Dendrite‐Free Lithium Deposition toward Highly Stable Lithium‐Metal Batteries

Advanced Science

Yumei Wang¹  Xiaolin Hu¹  Guanjie Lu¹  Zuguang Yang¹  Qiannan Zhao¹  Chaohe Xu¹  Fusheng Pan²  Ronghua Wang²  Qiwen Liu³  Xiukang Yang³ 

[1] College of Aerospace Engineering Chongqing University Chongqing 400044 P. R. China;College of Materials Science and Engineering Chongqing University Chongqing 400044 P. R. China;Hunan Province Key Laboratory of Electrochemical Energy Storage and Conversion School of Chemistry Xiangtan University Xiangtan 411105 P. R. China;

关键词: composite separator;    dendrite‐free deposition;    functionalization;    lithium anode;    lithium metal batteries;   

DOI  :  10.1002/advs.202102215

来源: DOAJ

【 摘 要 】

Abstract Direct application of metallic lithium (Li) as the anode in rechargeable lithium metal batteries (LMBs) is still hindered by some annoying issues such as lithium dendrites formation, low Coulombic efficiency, and safety concerns arising therefrom. Herein, an advanced composite separator is prepared by facilely blade coating lightweight and thin functional layers on commercial 12 µm polyethylene separator to stabilize the Li anode. The composite separator simultaneously improves the Li ion transport and lithium deposition behaviors with uniform lithium ion distribution properties, enabling the dendrite‐free Li deposition. As a result, the lithium anode can stably cycle up to 3000 cycles with the high capacity of 3.5 mAh cm−2. Moreover, the composite separator exhibits wide compatibility in LMBs (Li–S and Li‐ion battery) and delivers stable cycling performance and high Coulombic efficiency both in coin and lab‐level soft‐pack cells. Thus, this cost‐effective modification strategy exhibits great application potential in high‐energy LMBs.

【 授权许可】

Unknown