Fluorinated compounds for use in lithium battery electrolytes
View Patent ↗Provide are fluorinated cyclic and acyclic carbonate solvent compositions such as various fluorine substituted 1,3-dioxolane-2-one compounds and fluorine substituted 1,3-dioxane-2-one compounds, which are useful as electrolyte solvents for lithium ion batteries.
1. A solvent composition according to the formula R—O—C(═O)—O—R′, wherein R and R′ are each C(R h 7 )(R h 8 )CFR f 1 CHFR f 7 and wherein in each of the groups R and R′, R h 7 is H, R h 8 is CH 3 , R f 1 is F and R f 7 is CF 3 .
2. The solvent composition of claim 1 , further comprising a lithium salt.
3. A lithium ion battery comprising an electrolyte and a positive electrode and a negative electrode, wherein said electrolyte comprises the solvent composition according to claim 2 , wherein each of the fully charged electrodes of said battery have an ARC Exotherm Onset Temperature above about 150° C. in the presence of the solvent composition.
4. A lithium ion battery comprising an electrolyte and a positive electrode and a negative electrode, wherein said electrolyte comprises the solvent composition according to claim 2 , wherein each of the fully charged electrodes of said battery have an ARC Exotherm Onset Temperature above about 170° C. in the presence of the seat solvent composition.
5. The solvent composition of claim 2 , wherein the lithium salt is selected from the group consisting of LiPF 6 , LiBF 4 , LiClO 4 , lithium bis(oxalato)borate, LiN(SO 2 CF 3 ) 2 , LiN(SO 2 C 2 F 5 ) 2 , LiAsF 6 , LiC(SO 2 CF 3 ) 3 , and combinations thereof.
6. The solvent composition of claim 2 further comprising a cosolvent, selected from the group consisting of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, ethylmethyl carbonate, vinylene carbonate, vinylethylene carbonate, fluoroethylene carbonate, and a combination thereof.
7. A lithium ion battery comprising an electrolyte, wherein said electrolyte comprises the solvent composition according to claim 2 .