Journal
MATERIALS
Volume 15, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/ma15103662
Keywords
solid electrolyte interphase; high-voltage electrolyte; additives; electrochemical atomic force microscopy; lithium-ion batteries
Categories
Funding
- National Natural Science Foundation of China [22175192, U2032126]
- Natural Science Foundation of Zhejiang [LTY20B030001]
- Ningbo Natural Science Foundation [2021J224]
- Natural Science Foundation of Taizhou [LTY20B030001]
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The study demonstrates the importance of additives based on ADN and TMB in enhancing battery performance by forming a more stable interfacial film. These findings have significant implications for the development of high voltage lithium-ion batteries with improved performance.
Solid electrolyte interphase (SEI) formed at the interface in lithium-ion batteries plays an important role in isolating electrons and permeating ions during charging/discharging processes. Therefore, the formation of a good interface is crucial for better battery performance. In this study, additives based on adiponitrile (ADN) and trimethyl borate (TMB) were employed to broaden the electrochemical window and form a good SEI layer. Electrochemical Atomic force microscopy (EC-AFM) was used for in situ studies of film-formation mechanisms in high-voltage electrolytes on high-temperature pyrolytic graphite (HOPG), as well as Li- and Mn-rich (LMR) materials. X-ray photoelectron spectroscopy (XPS) combined with electrochemical methods revealed a synergistic reaction between the two additives to form a more stable interfacial film during charging/discharging processes to yield assembled batteries with improved cycle performance, its capacity increased from below 100 mAh/g to 200 mAh/g after 50 cycles. In sum, these findings would have great significance for the development of high voltage lithium-ion batteries with enhanced performance.
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