Multifunctional asymmetric electrolyte membrane encouraging durable lithium-metal batteries in wide temperature variations

作者：Liu, Yangxi; Wang, Suqing^*; Jiang, Zhouyang; Kong, Wenhan; Han, Qingyue; Ding, Liang-Xin; Wang, Haihui^*

来源：Journal of Membranes Science, 2023, 677: 121636.

DOI：10.1016/j.memsci.2023.121636

• Ultra-thin
• Asymmetric
• Wide temperature
• Lithium-metal batteries
• Interface optimization

The progress of high-performance lithium-metal batteries (LMBs) has been greatly impeded by lithium dendrite growth and electrolyte performance defects. Herein, an ultra-thin asymmetric multilayer composite electrolyte with a total thickness of 19 mu m is designed. The rigid metal-organic framework (MOF) tier with Li+ conductivity towards the anode side adjusts the even deposition of Li+, owns high elasticity modulus (6.4 GPa) to restrain lithium dendrite formation, and improves the thermostability of the membrane. The in-situ cross-linked polymer layer on the cathode side achieves good electrode-electrolyte interface contact. Consequently, the functional asymmetric multilayer composite electrolyte displays a superior ionic conductivity (0.68 mS cm(-1)) and a high-efficiency Li+ transference (t(Li)(+) = 0.47). The assembled Li||Li symmetric cells can cycle steadily for 1500 h at a high current density of 3 mA cm(-2) at 30 degrees C and 1000 h at 1 mA cm(-2) at 100 degrees C. The assembled LMBs with different cathodes show high rate capability and long-period cycling stability at room temperature. More impressively, the batteries display excellent electrochemical performance within -15 degrees C-100 degrees C and do not cause a short circuit even at 170 degrees C, showing high thermal safety. This work frames a neoteric strategy for the practical application of LMBs.

• 单位
  清华大学