Issue 41, 2022

Polydimethylsiloxane functionalized separator for a stable and fast lithium metal anode

Abstract

Uncontrollable lithium dendrite growth which typically results in poor cycling stability and safety issues remains a great challenge for lithium metal batteries. Herein, we report a novel separator modification strategy by using polydimethylsiloxane (PDMS) to functionalize a glass fiber separator to inhibit dendrite growth. The PDMS-modified separator not only acts as a mechanical barrier but also promotes the desolvation of lithium ions. Consequently, Li/Li symmetric cells with optimal PDMS-modified separators are able to stably cycle for more than 1200 hours at 2 mA cm−2 with a stable polarization voltage (about 60 mV). Moreover, with the assistance of the functionalized separator, the assembled Li/LiFePO4 full cell can impressively achieve capacity retention up to 82.5% and a coulombic efficiency of ∼99.4% after 200 cycles at 1.0 C. The PDMS functionalization strategy provides a simple and efficient approach for developing safe and high-performance lithium metal batteries.

Graphical abstract: Polydimethylsiloxane functionalized separator for a stable and fast lithium metal anode

Supplementary files

Article information

Article type
Paper
Submitted
29 Apr. 2022
Accepted
27 Jūn. 2022
First published
27 Jūn. 2022

CrystEngComm, 2022,24, 7298-7305

Polydimethylsiloxane functionalized separator for a stable and fast lithium metal anode

X. Lei, Z. Pei, B. Liu, Z. Zhu, A. Mosallanezhad, Y. Qian and G. Wang, CrystEngComm, 2022, 24, 7298 DOI: 10.1039/D2CE00595F

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