Fluorinated solid electrolyte interphase enables highly reversible solid-state Li metal battery

By Xiulin Fan, Xiao Ji, Fudong Han, J. Yue, Ji Chen, Long Chen, T. Deng, Jianjun Jiang, Chunsheng Wang. Science Advances, 2018

655 citations recorded by the source corpus.

A principle of suppressing Li dendrite in solid-state electrolytes is proposed and demonstrated using LiF-rich SEI experimentally. Solid-state electrolytes (SSEs) are receiving great interest because their high mechanical strength and transference number could potentially suppress Li dendrites and their high electrochemical stability allows the use of high-voltage cathodes, which enhances the energy density and safety of batteries. However, the much lower critical current density and easier Li dendrite propagation in SSEs than in nonaqueous liquid electrolytes hindered their possible applications. Herein, we successfully suppressed Li dendrite growth in SSEs by in situ forming an LiF-rich solid electrolyte interphase (SEI) between the SSEs and the Li metal. The LiF-rich SEI successfully suppresses the penetration of Li dendrites into SSEs, while the low electronic conductivity and the intrinsic electrochemical stability of LiF block side reactions between the SSEs and Li. The LiF-rich SEI enhances the room temperature critical current density of Li3PS4 to a record-high value of >2 mA cm−2. Moreover, the Li plating/stripping Coulombic efficiency was escalated from 88% of pristine Li3PS4 to more than 98% for LiF-coated Li3PS4. In situ formation of electronic insulating LiF-rich SEI provides an effective way to prevent Li dendrites in the SSEs, constituting a substantial leap toward the practical applications of next-generation high-energy solid-state Li metal batteries.

Subfields: Electrical and Electronic Engineering, Inorganic Chemistry

View Paper: https://www.semanticscholar.org/paper/c0d662d64862c85103d532522624245100fab337

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Electrical and Electronic Engineering

1. Michael J. Wang
2. Chunsheng Wang
3. Rishav Choudhury
4. Xiulin Fan
5. D. Su
6. Xiao Ji
7. Singyuk Hou
8. Ji Chen

In Inorganic Chemistry

1. J. Sakamoto

Citations in the corpus

• Characterizing the Li-Solid-Electrolyte Interface Dynamics as a Function of Stack Pressure and Current Density (2019, background): “Because of this challenge, a significant emphasis has been placed on studying the interface between the solid electrolyte and Li metal during Li plating and, subsequently, the rate at which Li plates in solid-state systems has steadily been improving to current densities above 1mA cm (2).(3,8,9) As ”
• Designing In-Situ-Formed Interphases Enables Highly Reversible Cobalt-Free LiNiO2 Cathode for Li-ion and Li-metal Batteries (2019, background): “17 eV).(39,44) As a result, a LiF-rich CEI is an ideal shield to protect the surface layer of delithiated LNO from the attacking of HF and other free radical groups in electrolytes, thereby reducing the loss of oxygen coordinates and suppressing the irreversible phase transformation of LNO into diso”