Solid polymer electrolyte composition and method of synthesizing the same

A solid polymer electrolyte composition, comprising:

• at least one lithium salt;
• a crosslinking polymer, comprising:
• a first segment comprising polyalkylene oxide backbone and/or polysiloxane backbone;
• a second segment comprising a urea linkage and/or a urethane linkage;
• a third segment comprising a silane domain;
• and
• a fourth segment comprising a phenylene structure;
• and
• an additive adapted to increase an ionic conductivity of the solid polymer electrolyte composition.

A method of synthesizing a solid polymer electrolyte composition, comprising:

• reacting a plurality of precursors to form a crosslinking polymer, the crosslinking polymer comprising:
• a first segment comprising a polyalkylene oxide backbone and/or polysiloxane backbone;
• a second segment comprising a urea linkage and/or a urethane linkage;
• a third segment comprising a silane domain;
• and
• a fourth segment comprising a phenylene structure;
• and
• adding a lithium salt to the crosslinking polymer.