UChicago Argonne, LLC

Baris Key

John Thomas Vaughey

Chen Liao

Niya Sa

Hao Wang

Binghong Han

Fulya Dogan Key

A lithium-ion electrochemical cell comprises a first electrode, a second electrode comprising elemental silicon, a microporous separator membrane between the first and second electrodes, and an electrolyte in contact with the electrodes and the membrane. The electrolyte comprises a lithium salt at a concentration in the range of about 0.1 M to about 5 M, and an additional metal salt at a concentration in the range of about 0.001 to about 5 M dissolved in an organic solvent. The additional metal salt comprises a metal cation that can form a lithium-silicon-metal Zintl phase; and the first electrode comprises metallic lithium or a cathode active material capable of donating and accepting lithium ions to and from the second electrode during electrochemical cycling. Electrolytes for use with silicon-containing electrodes also are described.

Electrolyte compositions for stabilizing silicon electrodes in lithium batteries

An electrochemical cell includes a high voltage cathode configured to operate at 1.5 volts or greater, an anode including Mg, and an electrolyte including an at least one organic solvent, at least one magnesium salt, and at least one additive agent including a Lewis base, wherein the electrolyte is halogen-free.

Halogen-free electrolytes for magnesium batteries

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Baris Key