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|1. (WO2017056981) LITHIUM ION SECONDARY BATTERY, METHOD FOR PRODUCING SAME, AND METHOD FOR EVALUATING SAME|
|Applicants:||NEC ENERGY DEVICES, LTD.
|Title:||LITHIUM ION SECONDARY BATTERY, METHOD FOR PRODUCING SAME, AND METHOD FOR EVALUATING SAME|
Provided is a lithium ion secondary battery which includes: a positive electrode which contains, as the positive electrode active substance, a compound oxide that contains lithium and nickel and that has a lamellar crystal structure; a negative electrode which contains a graphite material as the negative electrode active substance; and an electrolyte. The lithium ion secondary battery has a Warburg coefficient (σ0) per charge capacity as found by the alternating impedance method of 0.005 or less.