The invention relates to the technical field of energy storage, and provides a lithium ion battery electrolyte and preparation thereof. A composite lithium salt is dissolved in an organic solvent, the composite lithium salt comprises a lithium salt additive and lithium hexafluorophosphate, and the molar concentration of final lithium ions is 0.8-2.5 mol/L when the composite lithium salt is dissolved in an electrolyte solvent. The bis (trifluoromethylsulfonyl) lithium imide obviously improves the low-temperature performance and the high-temperature performance of the battery, and the bis (trifluoromethylsulfonyl) lithium imide is used as a main lithium salt additive and is matched with lithium hexafluorophosphate, so that the ionic conductivity of the electrolyte can be further improved, the component proportion of an SEI film can be improved, the conduction of Li<+> is facilitated. The positive electrode structure is stabilized, and the dissolution of transition metal ions is inhibited, so that the rate capability and the cycle performance of the lithium ion battery are improved. The invention also provides an electric vehicle with the lithium ion battery.
本发明涉及储能技术领域,其提供一种锂离子电池电解液及其制备,其将复合锂盐溶解到有机溶剂中,其中,复合锂盐包括锂盐添加剂和六氟磷酸锂,复合锂盐溶解在电解液溶剂中最终锂离子的摩尔浓度为0.8‑2.5mol/L。其中,双(三氟甲基磺酰)亚胺锂,对电池的低温性能和高温性能提升明显,在本发明中以双(三氟甲基磺酰)亚胺锂为主要的锂盐添加剂,使其与六氟磷酸锂相配合,从而可进一步提高电解液的离子电导率,改善SEI膜的成分比例,使其有利于Li+的传导,稳定正极结构,抑制过渡金属离子的溶解,从而改善锂离子电池的倍率性能和循环性能。本发明还提供一种具有上述锂离子电池的电动车。
Lithium ion battery electrolyte and preparation method thereof, lithium ion battery and electric vehicle
锂离子电池电解液及其制备方法、锂离子电池及电动车
2021-06-04
Patent
Electronic Resource
Chinese
IPC: | 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 / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen |
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