Research on practical high-specific energy quasi-solid-state lithium-ion battery system
Aiming at the potential safety problems such as electrolyte leakage,combustion and explosion in lithium-ion batteries,our work prepared an ether based prepolymer precursor,which were prepared by mixing a single ether molecule monomer with LiPF6-based electrolyte,and then derived a non-flow viscoelastic aggregate in situ at 60 ℃.By adjusting the monomer ratio and optimizing the in situ curing process,we prepared a high nickel/high silicon quasi-solid-state lithium ion battery.Our results show that the cycle life of 2.1 Ah battery system can reach 600 cycles at 0.3 C,and the retention rate is 1.8％higher than that of liquid battery in the same system.The 36 Ah battery based on the anode with higher silicon content has the highest specific energy of 351 Wh/kg and the capacity retention rate of 88.36％after 500 cycles.The quasi-solid-state lithium-ion battery shows excellent low temperature performance with the capacity retention rate of 85.6％at-20 ℃.The results show that the solidified electrolytes play a good role in the structural stability of the battery layer and interlayer.The development of the high specific energy quasi-solid-state lithium-ion battery system provides a feasible way for the further practical application of the subsequent energy storage solid-state battery.
solidified electrolytein situ curing processquasi-solid-state lithium-ion batterycycle lifespecific energy
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