| abstract |
The present invention provides a lithium-ion battery with simple manufacturing process, heat resistance and high energy density, characterized in that a separator is provided between the positive electrode and the negative electrode, which can absorb and release lithium ions of the battery and have irreversible capacity in the initial charge and discharge. The gaps in the separator are filled with a non-aqueous electrolyte solution containing lithium ions, and the positive electrode active material contained in the positive electrode has an initial charge and discharge efficiency of 80% to 90% when the metal Li is used as a counter electrode. The negative electrode active material contained in the negative electrode contains a mixed material of a silicon compound and a carbon material, and the negative electrode is in a state of being undoped with lithium in the irreversible capacity part in the initial charge and discharge, and in the initial charge capacity of the positive electrode and the negative electrode, The capacity ratio of the negative electrode relative to the positive electrode is not less than 0.95 and not more than 1, the positive electrode binder contained in the positive electrode is a water-based binder, the negative electrode binder contained in the negative electrode is polyimide, and the non- The aqueous electrolyte contains lithium dioxalate borate. |