Abstract
Lithium metal is the “holy grail” of anodes, capable of unlocking the full potential of cathodes in next-generation batteries. However, the use of pure lithium anodes faces several challenges in terms of safety, cycle life, and rate capability. Herein, a solution-processable conjugated microporous thermosetting polymer (CMP) is developed. The CMP can be further converted into a large-scale membrane with nanofluidic channels (5–6 Å). These channels can serve as facile and selective Li-ion diffusion pathways on the surfaces of lithium anodes, thereby ensuring stable lithium stripping/plating even at high areal current densities. CMP-modified lithium anodes (CMP-Li) exhibit cycle stability of 2550 h at an areal current density of 20 mA cm−2. Furthermore, CMP is readily amenable to solution-processing and spray coating, rendering it highly applicable to continuous roll-to-roll lithium metal treatment processes. Pouch cells with CMP-Li as the anode and LiNi0.8Co0.1Mn0.1O2 (NCM811) as the cathode exhibits a stable energy density of 400 Wh kg−1.
Original language | English |
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Article number | 2006323 |
Journal | Advanced Materials |
Volume | 33 |
Issue number | 5 |
DOIs | |
State | Published - 4 Feb 2021 |
Keywords
- conjugated microporous polymers
- energy density
- lithium metal batteries
- nanofluidic transport