Provided is a lithium ion secondary battery with high safety and high energy density which solves a concern about the safety, when a large amount of metal is used in a negative electrode active materials to achieve higher energy density and therefore an acceptable amount of lithium in a carbon material of the negative electrode is smaller than a releasable amount of lithium in a positive electrode active material. The present invention relates to a lithium ion secondary battery, wherein the positive electrode has a charge capacity per unit area of 3 mAh/cm2 or more, the negative electrode comprises a metal and/or a metal oxide and a carbon as negative electrode active materials, the acceptable amount of lithium in the carbon in the negative electrode is less than the releasable amount of lithium from the positive electrode, and the separator has a thermal shrinkage coefficient of less than 3% at a boiling point of the electrolyte solution in the electrolyte solution.
HIGH SAFETY AND HIGH ENERGY DENSITY BATTERY
26.04.2018
Patent
Elektronische Ressource
Englisch
IPC: | B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY |
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