<br/>Lithium metal battery (LMB) is widely-regarded as the next generation energy storage device for its high anode specific energy density (3860 Ah kg-1). However, the stable long-term operation of LMB is hindered by the unstable deposition process of Li+. Specifically, Li reacts with the electrolyte to form an inhomogeneous solid-electrolyte interphase (SEI) layer. This surface inhomogeneity is further amplified during electrochemical cycling, leading to dendritic deposition of Li, capacity fading, and even battery shorting and failure.<br/>My talk will focus on designing a polymer layer to address this interfacial instability. The first part of my talk will explore the mechanics of the interface. Maintaining the same polymer chemistry, we tuned the mechanical property of the polymer with hydrogen bonding strength, and we found polymers with viscoelastic mechanical properties are desirable for maintaining homogeneous coverage of the Li anode and promoting smooth deposition of Li. In the second part, I will introduce a cation-tethered viscoelastic polymer layer that responds to the local electric field environment at the Li metal anode, and repels incoming Li+ away from surface protrusions. In the third part, I will demonstrate a viscoelastic polymer layer that selectively transports salts over solvents and achieves state-of-the-art cycle life with both carbonate and ether based electrolyte in LMBs.

Designing polymer interfaces for lithium metal anodes

Fall 2022 abstracts, posters, and presentations will launch in mid-September.

ACS Fall 2022

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.