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Title: Mesoscale Elucidation of Surface Passivation in the Li–Sulfur Battery Cathode

Journal Article · · ACS Applied Materials and Interfaces

We report the cathode surface passivation caused by Li2S precipitation adversely affects the performance of lithium-sulfur (Li-S) batteries. Li2S precipitation is a complicated mesoscale process involving adsorption, desorption and diffusion kinetics, which are affected profoundly by the reactant concentration and operating temperature. In this work, a mesoscale interfacial model is presented to study the growth of Li2S film on carbon cathode surface. Li2S film growth experiences nucleation, isolated Li2S island growth and island coalescence. The slow adsorption rate at small S2- concentration inhibits the formation of nucleation seeds and the lateral growth of Li2S islands, which deters surface passivation. An appropriate operating temperature, especially in the medium-to-high temperature range, can also defer surface passivation. Fewer Li2S nucleation seeds form in such an operating temperature range, which facilitates heterogeneous growth and thereby inhibits the lateral growth of the Li2S film, which may also result in reduced surface passivation. Finally, the high specific surface area of the cathode microstructure is expected to mitigate the surface passivation.

Research Organization:
Texas A & M Univ., College Station, TX (United States). Texas A & M Engineering Experiment Station
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0006832
OSTI ID:
1430645
Journal Information:
ACS Applied Materials and Interfaces, Vol. 9, Issue 6; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 40 works
Citation information provided by
Web of Science

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Cited By (6)

The roles of oxygen vacancies, electrolyte composition, lattice structure, and doping density on the electrochemical reactivity of Magnéli phase TiO 2 anodes journal January 2018
Mesoscale Physicochemical Interactions in Lithium–Sulfur Batteries: Progress and Perspective journal October 2017
Factors of Kinetics Processes in Lithium–Sulfur Reactions journal May 2019
Revealing reaction mechanisms of nanoconfined Li 2 S: implications for lithium–sulfur batteries journal January 2018
A Li 2 S-Based Sacrificial Layer for Stable Operation of Lithium-Sulfur Batteries journal October 2018
Factors of Kinetics Processes in Lithium–Sulfur Reactions journal December 2019

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