Issue 24, 2022

A beneficial combination of formic acid as a processing additive and fluoroethylene carbonate as an electrolyte additive for Li4Ti5O12 lithium-ion anodes

Abstract

The aqueous processing of lithium transition metal oxide active materials such as Li4Ti5O12 (LTO) into electrodes remains a challenge owing to the high reactivity of such materials in contact with water, resulting in a rapid pH increase, aluminum current collector corrosion, and inferior cycling stability. Herein, the addition of formic acid (FA) as an electrode slurry processing additive is investigated, including a variation of the mixing speed as an additional important parameter. Following the identification of suitable electrode preparation conditions, the effect of fluoroethylene carbonate (FEC) as an electrolyte additive is studied in half-cells and full-cells comprising a LiNi0.5Mn0.3Co0.2O2 (NMC532) based positive electrode. Owing to the beneficial impact of FEC on the solid electrolyte interphase (SEI) formed at the LTO|electrolyte interface, involving specifically the suppression of lithium salt decomposition, both the half-cells and the LTO‖NMC532 full-cells exhibit a superior performance, achieving a capacity retention of 84.3% and 64.1% after 5000 and 10 000 cycles at 2C, respectively.

Graphical abstract: A beneficial combination of formic acid as a processing additive and fluoroethylene carbonate as an electrolyte additive for Li4Ti5O12 lithium-ion anodes

Supplementary files

Article information

Article type
Communication
Submitted
24 Jun 2022
Accepted
02 Nov 2022
First published
02 Nov 2022
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2022,3, 8926-8933

A beneficial combination of formic acid as a processing additive and fluoroethylene carbonate as an electrolyte additive for Li4Ti5O12 lithium-ion anodes

Y. Xu, T. Diemant, G. Kim, S. Passerini and D. Bresser, Mater. Adv., 2022, 3, 8926 DOI: 10.1039/D2MA00741J

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