UChicago Argonne, LLC

Cameron Peebles

Chen Liao

Daniel Abraham

Hakim H Iddir

Ilya A Shkrob

Juan Garcia

Zhengcheng Zhang

This invention relates to an electrolyte composition for a lithium ion battery comprising a lithium salt in a non-aqueous solvent containing an additive comprising a compound of formula RSiOP(O)F; wherein each R independently is a hydrocarbyl group; and n is 0 or 1; and wherein the additive is substantially free from (RSiO)P(O)and (RSiO)P(O)F. Electrochemical cells and batteries also are described.

Additives for high voltage lithium ion batteries

This invention relates to a method for preparing an electrochemical cell comprising the sequential steps of preparing a solution of a lithium salt in an non-aqueous solvent containing an additive compound, and maintaining the solution at a temperature in the range of about 20 to about 30&#xb0; C. for about 5 to 10 days to form an aged electrolyte; assembling an electrochemical cell from an anode, a cathode, and the aged electrolyte; and electrochemically subjecting the electrochemical cell to formation cycling. The additive compound comprises one or more compounds selected from the group consisting of: (RSiO)B, (RSiO)XY, (RSiO)P, (R'O)PO, (RSi)X&#x2032;, RSiOS(O)R&#x2032;; (RSi)OC(&#x2550;O)R&#x2032;; wherein each R and R&#x2032; independently is a hydrocarbyl group; X is P or B; Y is O or S; X is Ti or Al. Electrochemical cells and batteries also are described.

A non-aqueous electrolyte for a lithium-ion battery comprises a lithium salt and an additive in an organic solvent. The additive comprises a di-substituted malonate silyl ester compound, in which the hydrogens of the malonate methylene group are replaced by substituents R(e.g., alkyl) and X (e.g., halogen). Each of the carboxylic acid groups of the malonate are esterified by a monovalent silyl group such as &#x2014;Si(R); or the two carboxylic acid groups are esterified by a single divalent silylene group such as &#x2014;Si(R)&#x2014; to form a ring therewith. Each Rand Rindependently is alkyl, phenyl, or alkoxy; and each substituted-alkyl comprises an alkyl moiety substituted with one or more group selected from alkenyl, alkynyl, hydroxy, halogen, alkoxy, carboxylic acid, carboxylic ester, carboxylic amide, phenyl, sulfonic acid, and phosphonic acid.

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Oak Park, IL, United States of America

Cameron Peebles