ORGANIC ELECTROLYTIC SOLUTION AND LITHIUM BATTERY INCLUDING THE SAME

• US 20160268635A1
• Filed: 03/11/2016
• Published: 09/15/2016
• Est. Priority Date: 03/12/2015
• Status: Active Grant

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Cha, Siyoung
• Granted Patent: US 10,199,686 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0567 characterised by the additives
• CPC Class Codes: H01M 10/0568 characterised by the solutes
• CPC Class Codes: H01M 2300/004 Three solvents
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

An organic electrolytic solution includes: a lithium salt; an organic solvent; a disultone-based compound represented by Formula 1; and a silicon-based compound represented by Formula 2:

• • wherein in Formulae 1 and 2,
  • A₁, A₂, A₃, and A₄ are each independently selected from a substituted or unsubstituted C1 to C5 alkyl group; a carbonyl group; or a sulfinyl group,
  • n1 to n4 each are independently an integer from 1 to 3,
  • when each of n1 to n4 is 2 or more, a plurality of A₁, A₂, A₃, or A₄ are identical or different,
  • X is N or O, and n is 0 or 1, when X is O, n is 0,
  • Y is a covalent bond, a carbonyl group, or —N═C(R_f)—, and
  • R_a, R_b, R_c, R_d, and R_e are the same as described in the detailed description.

Claims

1. An organic electrolytic solution comprising:

a lithium salt;

an organic solvent;

a disultone-based compound represented by Formula 1; and

a silicon-based compound represented by Formula 2;

2. The organic electrolytic solution of claim 1, wherein at least one of A₁, A₂, A₃, and A₄ is selected from an unsubstituted C1 to C5 alkyl group or a substituted C1 to C5 alkyl group, and

a substituent of the substituted C1 to C5 alkyl group comprises a halogen-substituted or unsubstituted C1 to C5 alkyl group;

a halogen-substituted or unsubstituted C5 to C10 aryl group;

a halogen-substituted or unsubstituted C2 to C10 heteroaryl group;

a halogen-substituted or unsubstituted C2 to C5 alkenyl group;

a halogen-substituted or unsubstituted C2 to C5 alkynyl group;

or a polar group having a heteroatom.

3. The organic electrolytic solution of claim 1, wherein at least one of A₁, A₂, A₃, and A₄ is an unsubstituted C1 to C5 alkyl group or a substituted C1 to C5 alkyl group, and

a substituent of the substituted C1 to C5 alkyl group is selected from the group consisting of a halogen, a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a tert-butyl group, a trifluoromethyl group, a pentafluoroethyl group, a phenyl group, a naphthyl group, a tetrafluorophenyl group, a pyrrolyl group, and a pyridinyl group.

4. The organic electrolytic solution of claim 1, wherein the disultone-based compound is represented by one of Formulae 3 and 4:

5. The organic electrolytic solution of claim 1, wherein the disultone-based compound is represented by one of Formulae 5 and 6:

6. The organic electrolytic solution of claim 5, wherein R₁, R₂, R₃, R₄, R₅, R₆, R₇, R₈, R₂₁, R₂₂, R₂₃, R₂₄, R₂₅, R₂₆, R₂₇, R₂₈, R₂₉, R₃₀, R₃₁, and R₃₂ are each independently selected from a group consisting of a hydrogen, F, CL, Br, I, a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a tert-butyl group, a trifluoromethyl group, a pentafluoroethyl group, a phenyl group, a naphthyl group, a tetrafluorophenyl group, a pyrrolyl group, and a pyridinyl group.

7. The organic electrolytic solution of claim 1, wherein the disultone-based compound is represented by one of Formulae 7 to 14:

8. The organic electrolytic solution of claim 1, wherein the silicon-based compound is represented by one of Formulae 19 to 21:

9. The organic electrolytic solution of claim 1, wherein the silicon-based compound is represented by one of Formulae 22 to 31:

10. The organic electrolytic solution of claim 1, wherein an amount of the disultone-based compound is in a range of about 0.01 wt % to about 10 wt % based on a total weight of the organic electrolytic solution.

11. The organic electrolytic solution of claim 1, wherein an amount of the silicon-based compound is in a range of about 0.01 wt % to about 5 wt % based on a total weight of the organic electrolytic solution.

12. The organic electrolytic solution of claim 1, wherein the organic solvent comprises at least one selected from the group consisting of ethyl methyl carbonate (EMC), methyl propyl carbonate, ethyl propyl carbonate, dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate, propylene carbonate (PC), ethylene carbonate (EC), fluoroethylene carbonate (FEC), butylene carbonate, ethyl propionate, ethyl butyrate, acetonitrile, succinonitrile (SN), dimethylsulfoxide, dimethylformamide, dimethylacetamide, gamma-valerolactone, gamma-butyrolactone, and tetrahydrofuran.

13. The organic electrolytic solution of claim 1, wherein the lithium salt has a concentration of about 0.01 M to about 5.0 M.

14. A lithium battery comprising:

a cathode;

an anode; and

an organic electrolytic solution wherein, the organic electrolytic solution comprises;

a lithium salt;

an organic solvent;

a disultone-based compound represented by Formula 1; and

a silicon-based compound represented by Formula 2;

15. The lithium battery of claim 14:

wherein the disultone-based compound is selected from the group consisting of compounds represented by Formulae 7 to 14;

16. The lithium battery of claim 14:

wherein the silicon-based compound is selected from the group consisting of compounds represented by Formulae 22 to 31;

17. The lithium battery of claim 14:

wherein an amount of the disultone-based compound is in a range of about 0.01 wt % to about 10 wt % based on a total weight of the organic electrolytic solution.

18. The lithium battery of claim 14:

wherein an amount of the silicon-based compound is in a range of about 0.01 wt % to about 5 wt % based on a total weight of the organic electrolytic solution.

19. The lithium battery of claim 14:

wherein the organic solvent comprises at least one selected from the group consisting of ethyl methyl carbonate (EMC), methyl propyl carbonate, ethyl propyl carbonate, dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate, propylene carbonate (PC), ethylene carbonate (EC), fluoroethylene carbonate (FEC), butylene carbonate, ethyl propionate, ethyl butyrate, acetonitrile, succinonitrile (SN), dimethylsulfoxide, dimethylformamide, dimethylacetamide, gamma-valerolactone, gamma-butyrolactone, and tetrahydrofuran.

20. The lithium battery of claim 14:

wherein the lithium salt has a concentration of about 0.01 M to about 5.0 M.