| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery employing a low crystalline carbon as a negative active substance which is superior in safety, high charging capacity, and superior practicality. SOLUTION: A lithium ion secondary battery having a positive electrode made of lithium transition metal oxide, a negative electrode made of a carbonaceous material, and an organic electrolyte 3, wherein a negative electrode active substance is composed of carbon particles of 3.45Å or more in average inter- layer distance [d002], and the carbon particles 1 are coated with an ion conductive polymer solid electrolyte 2 with lithium ion conductivity at normal temperature is 5×10<-5> S/cm or more. |
