Molecular Engineering toward Stabilized Interface: An Electrolyte Additive for High-Performance Li-Ion Battery

Abstract

A novel electrolyte additive, 3-oxabicyclo[3.1.0]hexane-2,4-dione (OHD), has been discovered and evaluated in Li 1.1 (Mn 1/3 Ni 1/3 Co 1/3 ) 0.9 O 2 /graphite cells under elevated temperature. When an appropriate amount of OHD is used, the cell capacity retention is improved from 60% (Gen 2 electrolyte alone) to 82% (Gen 2 electrolyte plus OHD) after 200 cycles with no obvious impedance increase. The amount of OHD added is the key to achieving the superior cell performance. The effect of OHD additive was investigated by means of electrochemical analysis, fourier transform infrared spectroscopy, scanning electron microscopy, and density functional theory computation.

Toward Improved Catholyte Materials for Redox Flow Batteries: What Controls Chemical Stability of Persistent Radical Cations?

“…21 For energy storage in RFBs or overcharge protection in the conventional lithium-ion batteries, the stability requirements are still more demanding. 22,23 With such escalating requirements, one increasingly enters into the realm of the exceptional, rare species that are exceedingly stable by nearly every standard and still they may be lacking in their performance as the catholyte ROMs.…”

“…Consequently, out of the already small subset of the “stable” RCs, a still smaller subset of very stable RCs is selected, and those exceptions are called “stable” or “persistent” . For energy storage in RFBs or overcharge protection in the conventional lithium-ion batteries, the stability requirements are still more demanding. , With such escalating requirements, one increasingly enters into the realm of the exceptional, rare species that are exceedingly stable by nearly every standardand still they may be lacking in their performance as the catholyte ROMs.…”

1,4-Bis(trimethylsilyl)-2,5-dimethoxybenzene: a novel redox shuttle additive for overcharge protection in lithium-ion batteries that doubles as a mechanistic chemical probe

“…The electrochemical properties of BTMSDB were evaluated using cyclic voltammetry in a Pt/Li/Li three-electrode cell containing 10 mM BTMSDB in ethyl carbonate and diethyl carbonate (1 : 4 v/v) with 0.5 M lithium bis(oxalato)borate (LiBOB) as the supporting electrolyte. LiBOB is a well-known battery additive for the protection of the electrode surface [19][20][21] and it was previously used for overcharge tests by Dahn et al 12 An automatic iR correction with a compensation level of 90% was applied before each CV measurement to eliminate the iR drop due to the solution resistance. As shown in Fig.…”

Enabling High-Temperature and High-Voltage Lithium-Ion Battery Performance through a Novel Cathode Surface-Targeted Additive

“…As such, they must be capable of tolerating the varied conditions that such a mixture of applications will experience while maintaining performance under the ever more demanding need for higher energy densities. Unfortunately, both the higher voltages necessary for achieving the required energy density and the elevated temperatures that come from broader application have proven a consistent problem for LIBs, with batteries suffering from decreased energy, capacity, and longevity. − Researchers have tried many approaches to resolve this problem, including new electrode materials, − new solvents and cosolvents, − and new additives, − among others.…”