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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

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Electrode Interface Engineering in Lithium-Sulfur Batteries Enabled by a Trifluoroacetamide-Based Electrolyte.

Liang He¹, Shiyu Shao¹, Chuanxin Zong¹

¹School of Metallurgy and Environment, Central South University, Changsha 410083, PR China.

ACS Applied Materials & Interfaces

|July 11, 2022

Summary

Trifluoroacetamide (TFA) additive enhances lithium-sulfur battery (LSB) cycle stability by increasing lithium sulfide solubility. This prevents passivation, enabling durable cycling and capacity retention for advanced energy storage.

Keywords:

SEI deposition behavior lithium−sulfur battery solubility trifluoroacetamide

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Lithium-sulfur batteries (LSBs) suffer from cycle instability and capacity fading due to lithium sulfide (Li2S) passivation.
This passivation layer hinders electrochemical reactions and limits the practical application of LSBs.

Purpose of the Study:

To investigate trifluoroacetamide (TFA) as an electrolyte additive to mitigate Li2S passivation in LSBs.
To enhance the solubility of Li2S and improve the overall cycle stability and performance of LSBs.

Main Methods:

Employing trifluoroacetamide (TFA) as an electrolyte additive in lithium-sulfur battery configurations.
Analyzing the solubilization effect of TFA on Li2S through intermolecular hydrogen and O-Li bonds.
Investigating the deposition behavior of Li2S and the formation of a LiF-rich solid electrolyte interface (SEI) layer.

Main Results:

TFA significantly increases Li2S solubility, promoting flower-like 3D deposition and alleviating electrode passivation.
A LiF-rich SEI layer effectively protects the Li metal anode and suppresses dendrite growth.
LSBs with TFA exhibit excellent capacity retention (681.2 mA h g⁻¹ after 400 cycles at 0.5 C) and high Coulombic efficiency (99%).
The batteries demonstrate remarkable stability under harsh conditions, including high rates, high sulfur loadings, lean electrolytes, and elevated temperatures.

Conclusions:

Trifluoroacetamide is a highly effective additive for enhancing the cycle stability of lithium-sulfur batteries.
The improved performance is attributed to TFA's ability to increase Li2S solubility and promote favorable deposition and SEI formation.
This study offers a promising strategy for overcoming practical challenges and advancing the development of high-performance LSBs.