Electrolyte additives
Described herein are additives for use in electrolytes that provide a number of desirable characteristics when implemented within batteries, such as high capacity retention during battery cycling at high temperatures. In some embodiments, a high temperature electrolyte includes a base electrolyte and one or more polymer additives, which impart these desirable performance characteristics.
1. A liquid electrolyte formulation, comprising:
a lithium salt,
a non-aqueous solvent, and
a polymer additive present at less than 10% by weight of the total weight of the liquid electrolyte formulation and represented by Formula (b):
where n is an integer greater than 1 and R 1 is an alkyl group or a substituted alkyl group and wherein the polymer additive is a homopolymer.
2. The liquid electrolyte formulation of claim 1 , wherein the polymer additive is represented by Formula (a):
3. The liquid electrolyte formulation of claim 1 , wherein the weight average molecular weight of the polymer additive is less than or equal to 500,000 g/mol.
4. The liquid electrolyte formulation of claim 1 , wherein the polymer additive is present at a concentration of at least 0.1 weight percent of the total weight of the liquid electrolyte formulation.
5. The liquid electrolyte formulation of claim 1 , wherein the polymer additive is present at a concentration of at least 0.5 weight percent of the total weight of the liquid electrolyte formulation.