Evolution of Protrusions on Lithium Metal Anodes Stabilized by a Solid Block Copolymer Electrolyte Studied Using Time-Resolved X-ray Tomography.

ACS Applied Materials & Interfaces
Vijay D VeeraraghavanNitash P Balsara

Abstract

Growing demand for rechargeable batteries with higher energy densities has motivated research focused on enabling the lithium metal anode. A prominent failure mechanism in such batteries is short circuiting due to the uncontrolled propagation of lithium protrusions that often have a dendritic morphology. In this paper, the electrodeposition of metallic lithium through a rigid polystyrene-b-poly(ethylene oxide) (PS-b-PEO or SEO) block copolymer electrolyte was studied using hard X-ray microtomography. In this system, protrusions were approximately ellipsoidal globules: we take advantage of this simple geometry to quantify their growth as a function of polarization time and electrolyte salt concentration. The growth of 47 different globules was tracked with time to obtain average velocities of globule growth into the electrolyte. The globule diameter was a linear function of globule height in the electrolyte with a slope of about 6, independent of time and electrolyte salt concentration.

References

Nov 26, 2013·Nature Materials·Katherine J HarryNitash P Balsara
Aug 12, 2015·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Ezzeldin MetwalliPeter Müller-Buschbaum
Oct 6, 2016·Scientific Reports·B Layla MehdiNigel D Browning
Jul 21, 2017·Physical Chemistry Chemical Physics : PCCP·Pallab BaraiVenkat Srinivasan
Jul 7, 2018·Journal of Synchrotron Radiation·Ronald J PandolfiAlexander Hexemer
May 24, 2019·ACS Applied Materials & Interfaces·Shaopeng LiXiaogang Zhang
Nov 27, 2019·ACS Applied Materials & Interfaces·Louise FrenckNitash P Balsara
Mar 18, 2020·Science Advances·Huadong YuanXiong Wen David Lou

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