| 摘要 |
Disclosed are a non-aqueous organic electrolyte, a preparation method therefor and a lithium ion secondary battery containing the non-aqueous organic electrolyte. The non-aqueous organic electrolyte comprises: a lithium salt, a non-aqueous organic solvent, and a non-aqueous organic electrolyte additive. The non-aqueous organic electrolyte additive is a non-aqueous organic electrolyte additive as shown in formula (I) and/or a non-aqueous organic electrolyte additive as shown in formula (II). The present invention solves the problem in the prior art of easy occurrence of side reaction between the non-aqueous organic electrolyte and a positive electrode active material in a fully-charged and high-voltage (a voltage of above 4.5 V) battery system which results in the cycle performance decrease, volume expansion and discharge capacity decrease of a lithium ion secondary battery. The non-aqueous organic electrolyte still shows good cycle performance in an operating environment with a high voltage of about 4.9 V. |
