en سیستم های ذخیره ساز انرژی Storage systems (battery, ultracapacitor, flywheel, etc) پژوهشي Research <span style="font-size:11pt"><span style="unicode-bidi:embed"><span style="line-height:115%"><span sans-serif="" style="font-family:Calibri,"><span style="font-size:10.0pt"><span style="background:white"><span style="line-height:115%"><span new="" roman="" style="font-family:" times=""><span style="color:#0d0d0d">The global transition towards renewable energy necessitates efficient energy storage solutions to address the intermittency of renewable sources. Lithium-ion batteries (LIBs), widely utilized in electric vehicles (EVs) for their high energy density and efficiency, yet their performance at low temperatures remains a challenge. This study investigates the influence of electrolyte solvent composition on LIB performance under low-temperature conditions. Three electrolytes were studied: a standard electrolyte (STDE) comprising 1 M LiPF₆ in ethylene carbonate (EC) and diethyl carbonate (DEC), a low-temperature electrolyte (LTE) consisting of 1 M LiPF₆ in EC, ethyl methyl carbonate (EMC), and ethyl acetate (EA), and a long-cycle-life electrolyte (LCLE) containing 1 M LiPF₆ in EC/EMC. The EIS results revealed significant differences in resistance values among the electrolytes at varying temperatures. Specifically, at 0 &deg;C, the STDE exhibited a charge transfer resistance (<i>R</i>_ct) of 1055.3 &Omega; and a solid electrolyte interface resistance (<i>R</i>_SEI) of 803.4 &Omega;, whereas the LTE showed a substantially lower <i>R</i>_ct of 507.4 &Omega; and <i>R</i>_SEI of 64.2 &Omega;, indicating superior low-temperature performance. Similarly, at -20 &deg;C, the <i>R</i>_ct values for STDE, LTE, and LCLE were 8878.6 &Omega;, 854.2 &Omega;, and 15622 &Omega;, respectively, with corresponding <i>R</i>_SEI values of 172.1 &Omega;, 92.4 &Omega;, and 2364 &Omega;</span></span></span></span></span><span style="background:white"><span segoe="" style="font-family:" ui=""><span style="color:#0d0d0d">.</span></span></span><span style="font-size:10.0pt"><span style="background:white"><span style="line-height:115%"><span new="" roman="" style="font-family:" times=""><span style="color:#0d0d0d"> Notably, the addition of EA in the LTE formulation contributed to enhanced low-temperature performance, likely by lowering the overall viscosity of the electrolyte mixture and improving ionic mobility. This study demonstrates the critical role of solvent composition, particularly EA, in optimizing LIB performance for cold climate applications.</span></span></span></span></span></span></span></span></span><br> &nbsp; Lithium-ion Battery, Electrolyte, Solvent, Low-Temperature, Electrochemical Impedance Spectroscopy 4360 4368 http://ase.iust.ac.ir/browse.php?a_code=A-10-799-1&slc_lang=en&sid=1 Mohammad Zarei-Jelyani zjmohammad.ui@gmail.com 180031947532846004725 180031947532846004725 Yes Department of Energy Storage, Institute of Mechanics, Shiraz, Iran Amirhossein Salehi amirhsalehi.23@gmail.com 180031947532846004726 180031947532846004726 No Department of Energy Storage, Institute of Mechanics, Shiraz, Iran Mohsen Babaiee mbabaiee@gmail.com 180031947532846004727 180031947532846004727 No Department of Energy Storage, Institute of Mechanics, Shiraz, Iran Mohammad Mohsen Loghavi mloghavi@gmail.com 180031947532846004728 180031947532846004728 No Department of Energy Storage, Institute of Mechanics, Shiraz, Iran