Rechargeable lithium ion battery, and manufacturing method for rechargeable lithium ion battery

1. A rechargeable lithium ion battery, comprising

a negative electrode including a negative active material, the negative active material including a carbon-based active material,

a positive electrode including a compressed positive active material layer, the compressed positive active material layer in the rechargeable lithium ion battery having a density of 2.0 g/cm 3 to 3.0 g/cm 3 ; and

an electrolyte solution that includes a S═O-containing compound, the S═O-containing compound including dimethyl sulfurous acid, diethyl sulfurous acid, ethylene sulfurous acid, dimethyl sulfuric acid, or diethyl sulfuric acid, and

the S═O-containing compound is included in the electrolyte in an amount of about 0.5 volume % to less than 5.0 volume %, based on a total volume of the electrolyte solution.

2. The rechargeable lithium ion battery as claimed in claim 1 , wherein:

the electrolyte solution further includes an additive, the additive including a compound represented by one of the following Chemical Formula 1a or 1b:

X is a Group 13 element, a Group 14 element, or a Group 15 element,

Y is a Group 16 element, and

R 1 to R 3 are each independently a substituted or unsubstituted C1 to C4 alkyl group.

3. The rechargeable lithium ion battery as claimed in claim 1 , wherein:

the electrolyte solution further includes an additive, the additive including a compound represented by the following Chemical Formula 2a:

A is a Group 1A element, a Group 2A element, or aluminum,

M is a transition metal, a Group 3B element, a Group 4B element, or a Group 5B element,

R 4 is a halogen,

Z is —OC—R 51 —CO—, —OC—C(R 52 ) 2 —, or —OC—CO—, in which R 51 is an alkylene group, a halogenated alkylene group, an arylene group, or a halogenated arylene group, and each R 52 is independently an alkyl group, a halogenated alkyl group, an aryl group, or a halogenated aryl group,

a is an integer of 1 to 4,

b is 0, 2, or 4, and

c, d, m, and n are each independently integers of 1 to 3.

4. The rechargeable lithium ion battery as claimed in claim 1 , wherein:

the electrolyte solution includes:

a first additive, the first additive including a compound represented by one of Chemical Formula 1a or 1b, and

a second additive, the second additive including a compound represented by Chemical Formula 2a:

X is a Group 13 element, a Group 14 element, or a Group 15 element,

Y is a Group 16 element, and

R 1 to R 3 are each independently a substituted or unsubstituted C1 to C4 alkyl group,

A is a Group 1A element, a Group 2A element, or aluminum,

M is a transition metal, a Group 3B element, a Group 4B element, or a Group 5B element,

R 4 is a halogen,

Z is —OC—R 51 —CO—, —OC—C(R 52 ) 2 —, or —OC—CO—, in which R 51 is an alkylene group, a halogenated alkylene group, an arylene group, or a halogenated arylene group, and each R 52 is independently an alkyl group, a halogenated alkyl group, an aryl group, or a halogenated aryl group,

a is an integer of 1 to 4,

b is 0, 2, or 4, and

c, d, m, and n are each independently integers of 1 to 3.

5. The rechargeable lithium ion battery as claimed in claim 2 , wherein:

X is boron or phosphorus, and

Y is oxygen.

6. The rechargeable lithium ion battery as claimed in claim 2 , wherein the additive includes tris(trifluoromethyl)phosphoric acid.

7. The rechargeable lithium ion battery as claimed in claim 3 , wherein M is boron or phosphorus.

8. The rechargeable lithium ion battery as claimed in claim 3 , wherein the additive includes at least one of lithium difluoro(oxalato-O,O′) borate and lithium difluoro bis(oxalato-O,O′)phosphate.

9. The rechargeable lithium ion battery as claimed in claim 2 , wherein the additive is included in the electrolyte solution in an amount of about 1 wt % to about 4 wt %, based on a total weight of the electrolyte solution.

10. The rechargeable lithium ion battery as claimed in claim 3 , wherein the additive is included in the electrolyte solution in an amount of greater than or equal to about 0.25 wt %, based on a total weight of the electrolyte solution.

11. The rechargeable lithium ion battery as claimed in claim 4 , wherein:

the first additive is included in the electrolyte solution in an amount of about 1 wt % to about 4 wt %, based on a total weight of the electrolyte solution,

the second additive is included in the electrolyte solution in an amount of greater than or equal to about 0.25 wt %, based on the total weight of the electrolyte solution, and

a total weight of the first additive and the second additive in the electrolyte solution is less than or equal to 5 wt %, based on the total weight of the electrolyte solution.

12. The rechargeable lithium ion battery as claimed in claim 1 , wherein the electrolyte solution includes hydrofluoroether.

13. The rechargeable lithium ion battery as claimed in claim 1 , wherein the electrolyte solution includes at least one of a linear carbonate ester or a fluoro ethylene carbonate.

14. The rechargeable lithium ion battery as claimed in claim 1 , wherein the negative active material includes a silicon-based active material.

15. The rechargeable lithium ion battery as claimed in claim 14 , wherein the silicon-based active material includes Si, a Si-based alloy, SiO x , in which 0<x<2, or a combination thereof.

16. The rechargeable lithium ion battery as claimed in claim 1 , wherein the compressed positive active material layer in the rechargeable lithium ion battery has a density of 2.5 g/cm 3 to 3.0 g/cm 3 .

17. The rechargeable lithium ion battery as claimed in claim 1 , wherein the S═O-containing compound includes dimethyl sulfurous acid, diethyl sulfurous acid, ethylene sulfurous acid, or diethyl sulfuric acid.

18. The rechargeable lithium ion battery as claimed in claim 1 , wherein the S═O-containing compound includes dimethyl sulfurous acid, ethylene sulfurous acid, or diethyl sulfuric acid.