Rational design of polymer-based insulating scaffolds for high-capacity lithium metal batteries

Authors
Jo, JinhyeonKim, SubinKwon, JunhwaCho, Ki-YeopSong, HayongShin, JaewookLee, Seung JongKim, WonkeunRyu, Kyoung HanEom, Kwangsup
Issue Date
2024-09
Publisher
Elsevier BV
Citation
Chemical Engineering Journal, v.495
Abstract
Lithium metal is a promising anode material for next-generation high-energy-density secondary batteries. However, the uncontrolled growth of Li dendrites leads to infinite volume expansion and poor cycling stability. Herein, we propose a designable insulating polydopamine (PDA)-coated porous polytetrafluoroethylene (PTFE) scaffold. A porous PTFE (pPTFE) scaffold with micron-sized pores was fabricated, which provided bottom-up Li deposition owing to its insulating nature. Furthermore, the PDA-coated porous PTFE (PDA-pPTFE) scaffold provided internal space for Li growth and homogenized the Li-ion flux with abundant polar functional groups in the PDA, enabling "bottom-up" Li deposition within the scaffold without dendrite growth. This uniquely designed scaffold demonstrated excellent performance in half and symmetric cells with a small voltage hysteresis and dendrite-free Li plating. Moreover, when coupled with high-loading NCM cathodes (similar to 4 mA h cm(-2)), the PDA-pPTFE-based full cells exhibited stable cycling and rate performance, even with a low NP ratio of 1.0 at a rate of 1/3C, and exhibited a high energy density of 801 W h L-1. These results indicated the potential of the PDA-pPTFE scaffold as an anode material for highly stable next-generation rechargeable batteries.
Keywords
HIGH-ENERGY; ANODE; DEPOSITION; ION; STRATEGIES; DENSITY; GROWTH; Lithium metal batteries; Lithium metal anodes; Porous scaffold; Polydopamine; PTFE; High energy full-cell
ISSN
1385-8947
URI
https://pubs.kist.re.kr/handle/201004/150295
DOI
10.1016/j.cej.2024.153383
Appears in Collections:
KIST Article > 2024
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