Bis(phenylsulfonyl)Methane (BPSM) as Multifunctional Electrolyte Additive Constructing a Stable Interfaces for...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Nickel-rich lithium-ion batteries, such as LiNi0.8Co0.1Mn0.1O2, are crucial for energy storage but suffer from performance degradation.
• Stable electrode/electrolyte interfacial films are essential for improving battery cycle life and performance.

Purpose of the Study:

• To investigate the efficacy of Bis(phenylsulfonyl)methane (BPSM) as a functional electrolyte additive.
• To enhance the performance of LiNi0.8Co0.1Mn0.1O2/graphite lithium-ion batteries at various temperatures.

Main Methods:

• Electrochemical testing of batteries with and without BPSM at 25 °C and -10 °C.
• Spectroscopic characterizations to analyze interfacial film formation.
• Theoretical calculations to understand BPSM's electrochemical behavior.

Main Results:

• BPSM addition significantly improved capacity retention after 1200 cycles at 25 °C (8.68% to 83.07%).
• Capacity retention after 130 cycles at -10 °C increased dramatically with BPSM (21.01% to 98.97%).
• BPSM preferentially oxidized/reduced on electrodes, forming stable, highly conductive interphases.

Conclusions:

• Bis(phenylsulfonyl)methane is an effective film-forming additive for lithium-ion batteries.
• BPSM demonstrates promising applications for improving the performance of nickel-rich lithium-ion batteries, especially at low temperatures.