Electrolyte cosolvents including acrylate and methacrylate oligomers
AssigneeRohm and Haas Company
InventorsEdward Ewart LaFleur, Jian Huang
Life of this patent
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Abstract
A new class of low flammability cosolvents comprising saturated C1-C8 alkyl (meth)acrylate oligomers having a molecular weight in the range of from about 160 to 1000 g/mol are disclosed for use in nonaqueous electrolytes for electrochemical cells. A novel process for preparing saturated meth(acrylic) oligomeric electrolyte cosolvents is also disclosed. Secondary electrochemical cells employing an anode, a cathode, and a non-aqueous electrolyte solution comprising these new cosolvents are also disclosed.
Claims11
A non-aqueous electrolyte solution comprising at least one liquid saturated oligomer of a C1-C8 alkyl methacrylate or C1-C8 alkyl acrylate having a molecular weight in the range of from 160 g/mol to 1000 g/mol.
A process for preparing an electrolyte cosolvent comprising:
- (a) forming a reaction mixture comprising
- (i) from 10 to 100 percent by weight of the reaction mixture of at least one C1-C8 alkyl methacrylate or C1-C8 alkyl acrylate monomer;
- (ii) from 0 to 90 percent by weight of the reaction mixture of a hydrocarbon solvent;
- and
- (iii) from 0 to 20 percent by weight of the reaction mixture of a hydrocarbon initiator;
- (b) continuously charging the reaction mixture into a well-mixed continuous flow stirred tank reactor maintained at a reaction temperature within the range of from about 300° C. to about 400° C.;
- (c) removing an unsaturated oligomeric reaction product from the reactor at a rate sufficient to provide a reaction residence time in the range of from about 3 to about 60 minutes;
- (d) removing volatiles from the unsaturated oligomeric reaction product;
- and
- (e) hydrogenating the unsaturated oligomeric reaction product to form a saturated oligomer of a C1-C8 alkyl methacrylate or C1-C8 alkyl acrylate having a molecular weight in the range of from about 160 to about 1000 g/mol.
A secondary electrochemical cell employing an anode, a cathode, and a non-aqueous electrolyte solution, wherein the nonaqueous electrolyte solution comprises at least one saturated oligomer of a C1-C8 alkyl methacrylate or C1-C8 alkyl acrylate having a molecular weight in the range of from about 160 to 1000 g/mol.
Dependencies are inferred from the claim text.