电解质
材料科学
阴极
电极
锂(药物)
离子键合
金属
电阻率和电导率
离子电导率
相间
分析化学(期刊)
化学工程
无机化学
作者
Meisam Hasanpoor,Damien Saurel,Rosalía Cid,Kilian Fraysse,María Echeverría,Maria Jáuregui,Francisco Bonilla,George W. Greene,Robert Kerr,Maria Forsyth,Patrick C. Howlett
标识
DOI:10.1021/acsami.1c21853
摘要
Employing high-voltage Ni-rich cathodes in Li metal batteries (LMBs) requires stabilization of the electrode/electrolyte interfaces at both electrodes. A stable solid-electrolyte interphase (SEI) and suppression of active material pulverization remain the greatest challenges to achieving efficient long-term cycling. Herein, studies of NMC622 (1 mAh cm-2) cathodes were performed using highly concentrated N-methyl-N-propylpyrrolidinium bis(fluorosulfonyl)imide (C3mpyrFSI) 50 mol % lithium bis(fluorosulfonyl)imide (LiFSI) ionic liquid electrolyte (ILE). The resulting SEI formed at the cathode enabled promising cycling performance (98.13% capacity retention after 100 cycles), and a low degree of ion mixing and lattice expansion was observed, even at an elevated temperature of 50 °C. Fitting of acquired impedance spectra indicated that the SEI resistivity (RSEI) had a low and stable contribution to the internal resistivity of the system, whereas active material pulverization and secondary grain isolation significantly increased the charge transfer resistance (RCT) throughout cycling.
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