Method for manufacturing lithium ion secondary battery, and packaging thereof containing pre-charged lithium ion secondary battery

1. A method for manufacturing a lithium ion secondary battery,

the lithium ion secondary battery comprising:

a positive electrode;

a negative electrode comprising a negative electrode active material layer comprising a graphite;

an aprotic electrolyte solution comprising a sulfonate ester having at least two sulfonyl groups; and

a packaging material comprising a laminate film involving the positive electrode, the negative electrode and the aprotic electrolyte solution, and

the method comprising:

enclosing the positive electrode, the negative electrode and the aprotic electrolyte solution in the packaging material to fabricate a lithium ion secondary battery before pre-charge;

pre-charging the lithium ion secondary battery at a current value of between 0.05 C and 0.25 C to a voltage between 3.3 V and 3.5 V; and

opening the enclosure of the packaging material of the lithium ion secondary battery after pre-charge, thereafter vacuum sealing the packaging material, and regularly charging the lithium ion secondary battery after pre-charge.

2. The method for manufacturing a lithium ion secondary battery according to claim 1 , wherein the sulfonate ester is a cyclic sulfonate ester represented by the following formula (1):

wherein Q denotes an oxygen atom, a methylene group or a single bond; A1 denotes a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms, a carbonyl group, a sulfinyl group, a substituted or unsubstituted fluoroalkylene group having 1 to 6 carbon atoms, or a divalent group having 2 to 6 carbon atoms in which alkylene units or fluoroalkylene units are bonded through an ether bond; and A2 denotes a substituted or unsubstituted alkylene group, a substituted or unsubstituted fluoroalkylene group or an oxygen atom.

3. The method for manufacturing a lithium ion secondary battery according to claim 1 , wherein the sulfonate ester is a chain sulfonate ester represented by the following formula (2):

wherein R 1 and R 4 each independently denote an atom or a group selected from a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 5 carbon atoms, a substituted or unsubstituted fluoroalkyl group having 1 to 5 carbon atoms, a polyfluoroalkyl group having 1 to 5 carbon atoms, —SO 2 X 1 (wherein X 1 is a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms), —SY 1 (wherein Y 1 is a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms), —COZ (wherein Z is a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms), and a halogen atom; and R 2 and R 3 each independently denote an atom or a group selected from a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 5 carbon atoms, a substituted or unsubstituted phenoxy group, a substituted or unsubstituted fluoroalkyl group having 1 to 5 carbon atoms, a polyfluoroalkyl group having 1 to 5 carbon atoms, a substituted or unsubstituted fluoroalkoxy group having 1 to 5 carbon atoms, a polyfluoroalkoxy group having 1 to 5 carbon atoms, a hydroxyl group, a halogen atom, —NX2X3 (wherein X2 and X3 are each independently a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms), and —NY2CONY3Y4 (wherein Y2 to Y4 are each independently a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms).

4. The method for manufacturing a lithium ion secondary battery according to claim 1 , wherein the pre-charge is carried out at a temperature between 10° C. and 30° C.

5. The method for manufacturing a lithium ion secondary battery according to claim 1 , wherein a battery element comprising the positive electrode and the negative electrode enclosed in the packaging material has a laminated structure.