TY  - JOUR
AU  - Xie, Donghao
AU  - Wang, Zekun
AU  - Ma, Xin
AU  - Feng, Yuchen
AU  - Tang, Xiaomin
AU  - Gu, Qiao
AU  - Deng, Yonghong
AU  - Gao, Ping
PY  - 2024
TI  - 2.5 μm-Thick Ultrastrong Asymmetric Separator for Stable Lithium Metal Batteries
JO  - Energy & Environmental Materials
SN  - 2575-0348
VL  - 7
IS  - 6
AB  - Lithium metal batteries (LMBs) are considered the ideal choice for high volumetric energy density lithium-ion batteries, but uncontrolled lithium deposition poses a significant challenge to the stability of such devices. In this paper, we introduce a 2.5 μm-thick asymmetric and ultrastrong separator, which can induce tissue-like lithium deposits. The asymmetric separator, denoted by utPE@Cu2O, was prepared by selective synthesis of Cu2O nanoparticles on one of the outer surfaces of a nanofibrous (diameter ~10 nm) ultrastrong ultrahigh molecular weight polyethylene (UHMWPE) membrane. Microscopic analysis shows that the lithium deposits have tissue-like morphology, resulting in the symmetric lithium cells assembled using utPE@Cu2O with symmetric Cu2O coating exhibiting stable performance for over 2000 h of cycling. This work demonstrates the feasibility of a facile approach ultrathin separators for the deployment of lithium metal batteries, providing a pathway towards enhanced battery performance and safety.
UR  - https://doi.org/10.1002/eem2.12746
DO  - 10.1002/eem2.12746