LITHIUM ION SECONDARY BATTERY, AND METHOD FOR PRODUCING THE SAME AND METHOD FOR EVALUATING THE SAME

1 . A lithium ion secondary battery comprising: a positive electrode comprising, as a positive electrode active material, a lithium nickel-containing composite oxide having a layered crystal structure; a negative electrode comprising, as a negative electrode active material, a graphitic material; and an electrolyte solution,

wherein a Warburg coefficient per charge capacity (σ 0 ), determined by an alternating current impedance method, is 0.005 or lower.

2 . A lithium ion secondary battery comprising: a positive electrode comprising, as a positive electrode active material, a lithium nickel-containing composite oxide having a layered crystal structure; a negative electrode comprising, as a negative electrode active material, a graphitic material; and an electrolyte solution,

wherein an electric double layer capacity (C dl ) and a Warburg coefficient per charge capacity (σ 0 ), determined by an alternating current impedance method, satisfy the following expression (1):

1/(σ 0 C dl )≥125   (1).

3 . The lithium ion secondary battery according to claim 2 , wherein the Warburg coefficient per charge capacity (σ 0 ) is 0.005 or lower.

4 . The lithium ion secondary battery according to claim 2 , wherein the electric double layer capacity per charge capacity is 1.5 (F/Ah) or higher.

5 . The lithium ion secondary battery according to claim 1 , wherein the electrolyte solution comprises a cyclic sulfonate ester compound.

6 . The lithium ion secondary battery according to claim 5 , wherein the electrolyte solution comprises, as the cyclic sulfonate ester compound, a cyclic disulfonate ester compound represented by the following formula (A):

wherein R 1 and R 2 each independently denote an atom or a substituent selected from the group consisting of a hydrogen atom, alkyl groups having 1 to 5 carbon atoms, halogen atoms and an amino group; and R 3 denotes a linkage group selected from the group consisting of alkylene groups having 1 to 5 carbon atoms, a carbonyl group, a sulfinyl group, a sulfonyl group, fluoroalkylene groups having 1 to 6 carbon atoms and divalent groups having 2 to 6 carbon atoms in which alkylene groups or fluoroalkylene groups are bonded through an ether bond.

7 . The lithium ion secondary battery according to claim 1 , wherein the lithium nickel-containing composite oxide has a nickel content (ratio in the number of atoms) in the metals occupying nickel sites of 60% or higher.

8 . The lithium ion secondary battery according to claim 1 , wherein the lithium nickel-containing composite oxide comprises, as metals other than nickel occupying the nickel sites, cobalt and manganese, or cobalt and aluminum.

9 . The lithium ion secondary battery according to claim 1 , wherein the electrolyte solution comprises a carbonate solvent.

10 . A method for evaluating a lithium ion secondary battery, the lithium ion secondary battery comprising: a positive electrode comprising, as a positive electrode active material, a lithium nickel-containing composite oxide having a layered crystal structure; a negative electrode comprising, as a negative electrode active material, a graphitic material; and an electrolyte solution,

the method comprising judging and selecting the lithium ion secondary battery as being a good-quality battery when the lithium ion secondary battery has a Warburg coefficient per charge capacity (σ 0 ) determined by an alternating current impedance method of 0.005 or lower.

11 . A method for evaluating a lithium ion secondary battery, the lithium ion secondary battery comprising: a positive electrode comprising, as a positive electrode active material, a lithium nickel-containing composite oxide having a layered crystal structure; a negative electrode comprising, as a negative electrode active material, a graphitic material; and an electrolyte solution,

the method comprising judging and selecting the lithium ion secondary battery as being a good-quality battery when the lithium ion secondary battery has an electric double layer capacity (C dl ) and a Warburg coefficient per charge capacity (σ 0 ), determined by an alternating current impedance method, satisfying the following expression (1):

1/(σ 0 C dl )≥125   (1).

12 . A method for producing a lithium ion secondary battery, the lithium ion secondary battery comprising: a positive electrode comprising, as a positive electrode active material, a lithium nickel-containing composite oxide having a layered crystal structure; a negative electrode comprising, as a negative electrode active material, a graphitic material; and an electrolyte solution,

the method comprising:

holding (A) a charged lithium ion secondary battery at 30° C. or higher and 60° C. or lower for 24 hours or longer and 720 hours or shorter;

determining a Warburg coefficient of the lithium ion secondary battery obtained after said holding (A) by an alternating current impedance method; and

judging the quality of the battery by utilizing the Warburg coefficient and selecting a good-quality battery.