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Ternary Salt–Solvent Electrolytes For 5 V-Class Anode-Less Li-Metal Batteries
Source: Shubhadeep Pal et al., ACS Energy Letters 2024
A three-salt combination of LiTFSI, LiDFOB, and LiPF6 in carbonate solvent (FEC/EMC) was developed for high-energy-density Li-metal batteries.
LiTFSI is highly corrosive to aluminum surfaces, which can be mitigated by passivating the Al current collector with the addition LiDFOB salt. However, the dual-salt combination of LiTFSI and LiDFOB does not deliver long-term cycling due to the rapid consumption of LiDFOB.
Adding LiPF6 improves cycling stability and long-term performance by creating a LiF-dense layer, enhancing ionic conduction.
The electrolyte was tested in a cobalt-free LiNi0.5Mn1.5O4–Li anode-less cell, which completed 65 cycles with less than 20% capacity loss.
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