LITHIUM ION SECONDARY BATTERY, LITHIUM ION SECONDARY BATTERY SYSTEM, METHOD FOR DETECTING POTENTIAL IN LITHIUM ION SECONDARY BATTERY, AND METHOD FOR CONTROLLING LITHIUM ION SECONDARY BATTERY

摘要

The present invention provides a lithium ion secondary battery by which it is possible to detect accurately potentials of a positive electrode and a negative electrode. The lithium ion secondary battery (120) of the present invention has a positive electrode (101), a negative electrode (102), a positive electrode reference electrode (104), and a negative electrode reference electrode (105). The positive electrode reference electrode includes a reference electrode positive electrode active material used in the positive electrode of a lithium battery or a lithium ion secondary battery, the negative electrode reference electrode includes a reference electrode negative electrode active material used in the negative electrode of a lithium battery or a lithium ion secondary battery, the reference electrode positive electrode active material is, e.g., an olivine-type lithium iron phosphate, and the reference electrode negative electrode active material is, e.g., lithium titanium oxide.