Improved SiGr/NCM523 Cycling via Triethyl Phosphate-Solubilized Lithium Nitrate Electrolyte

Rynearson, Leah; Jayawardana, Chamithri; Rodrigo, Nuwanthi D.; Lucht, Brett L.

doi:10.1021/acs.jpcc.2c08055

Title: Improved SiGr/NCM523 Cycling via Triethyl Phosphate-Solubilized Lithium Nitrate Electrolyte

Journal Article · Thu Jan 19 00:00:00 EST 2023 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/acs.jpcc.2c08055· OSTI ID:1914331

Rynearson, Leah ^[1]; Jayawardana, Chamithri ^[1];

^[1];

^[1]

Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881, United States

The performance of silicon–graphite (SiGr)/Li and SiGr/LiNi_0.5Co_0.2Mn_0.3O₂ (NCM523) cells was investigated in electrolytes containing lithium difluoro(oxalato)borate (LiDFOB) and lithium nitrate (LiNO₃) in ethylene carbonate (EC), ethylmethyl carbonate (EMC), and different proportions of triethyl phosphate (TEP). While the LiDFOB and LiNO₃-containing electrolytes both showed improved cycling stability over industry standards, the 10% TEP electrolyte demonstrated the best capacity retention in SiGr/Li cells and the best overall cycling performance in SiGr/NCM523 cells. Here, ex-situ surface analysis reveals that the LiDFOB and LiNO₃ preferentially decompose on both the anode and cathode surface during the first cycle to generate films consisting of oxalates, fluoroborates, and nitrate reduction products. Therefore, incorporation of two different film-forming additives into the electrolyte is significantly more beneficial in formation of a robust SEI and improved cycle life in silicon-containing anodes.

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Research Organization:: Univ. of Rhode Island, Kingston, RI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0021392

OSTI ID:: 1914331

Alternate ID(s):: OSTI ID: 1923657

Journal Information:: Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Vol. 127 Journal Issue: 4; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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