Method of producing a lithium battery cell containing a non-flammable quasi-solid electrolyte

A method of producing a rechargeable lithium cell or a plurality of lithium cells, said method comprising:

• A) providing at least a dry lithium cell, each cell comprising a cathode having a cathode active material, an anode having an anode active material, a lithium ion-permeable or porous separator electronically separating said anode and said cathode, and a protective casing, wherein said dry lithium cell is electrolyte-free or contains an initial amount of electrolyte less than a final desired amount;
• B) injecting a liquid electrolyte into said at least a dry lithium cell to form at least a wet cell, wherein said liquid electrolyte comprises a lithium salt dissolved in a first liquid solvent having a first lithium salt concentration from 0.001 M to 3.0 M (mole/L);
• C) removing a portion of said first liquid solvent from said at least a wet cell to obtain the at least one lithium cell comprising a quasi-solid electrolyte having a final lithium salt concentration higher than said first concentration and higher than 2.0 M;
• and
• D) optionally sealing the protective housing to produce said lithium cell or plurality of lithium cells.