| abstract |
(57) [Problem] To provide a lithium ion secondary battery having a magnetic susceptibility suitable for use near an MRI system. SOLUTION: The above problems are a) a case, b) a negative electrode made of a negative electrode active material intercalating with an alkali metal, c) a positive electrode made of a positive electrode active material intercalating with an alkali metal, and d) In an electrochemical cell comprising an electrolyte activating the negative electrode and the positive electrode, the negative electrode and the positive electrode are housed in a case and are electrochemically associated with each other, and the periphery of the positive electrode is The problem is solved by being completely bound by the periphery of the negative electrode, preventing the alkali metal from plating when the battery is cycled repeatedly between charge and discharge states. You. |