Self-sacrificial organic prelithiation additives for high-capacity lithium-ion batteries

Abstract

In this study, 3,6-dihydroxyphthalonitrile dilithium salt (Li₂C₈H₂N₂O₂, Li₂DHPN) is prepared and coated onto a PE separator to obtain a multifunctional prelithiation separator. When applied in LFP|MS-LD|Gr full cells, this separator increased the first-cycle reversible capacity by 4.14% and achieved a capacity retention of 90.6% after 600 cycles. Moreover, the delithiation product of Li₂DHPN dissolves into the electrolyte and helps improve the interfacial reaction kinetic performance of the battery.