Lithium ion battery and electric device

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery and a power utilization device. The tetraether nitrile additive is introduced into the electrolyte of the silicon negative electrode battery and is combined with the diisocyanate additive, and meanwhile, the content of the silicon negative electrode material is controlled, so that Li < + > is transferred during discharging by utilizing an ether bond structure of the tetraether nitrile compound on the premise of ensuring that the surface stability of the positive electrode and the negative electrode is improved; the purpose of improving rate discharge and low-temperature discharge performance is achieved, so that the cycle performance of a high-voltage LiCoO2 and high-silicon negative electrode system is improved. 本发明属于锂离子电池技术领域，尤其涉及一种锂离子电池及用电装置。本发明通过在硅负极电池的电解液中引入四醚腈类添加剂，与二异氰酸酯添加剂进行组合，同时控制硅负极材料的含量，在确保提高正负极表面稳定性的前提下，利用四醚腈类化合物具有的醚键结构，在放电时传递Li+，达到提高倍率放电及低温放电性能的目的，从而改善高电压LiCoO2和高硅负极体系的循环性能。