Ether-based electrolyte system improving or supporting anodic stability of electrochemical cells having lithium-containing anodes

An electrochemical cell that cycles lithium-ions having improved or optimized anodic stability comprising:

• a positive electrode comprising a positive lithium-based electroactive material and having a maximum potential greater than or equal to about 5V;
• a separator;
• a negative electrode comprising a negative electroactive material including lithium;
• and
• an electrolyte system comprising a bound moiety having an ionization potential greater than an electron affinity and comprising one or more salts bound to a solvent, wherein the one or more salts is selected from the group consisting of:
• lithium bis(fluorosulfonyl)imide (LiFSI), sodium bis(fluorosulfonyl)imide (NaFSI), potassium bis(fluorosulfonyl)imide (KFSI), and combinations thereof and the solvent comprises dimethoxyethane (DME), wherein the one or more salts have a concentration in the electrolyte system of greater than 4 M and a molar ratio of the one or more salts to the dimethoxyethane (DME) is greater than or equal to about 1 to less than or equal to about 1.5, and wherein the electrolyte system is substantially free of unbound dimethoxyethane (DME) and unbound bis(fluorosulfonyl)imide (FSI−).