LAUSR

Abstract For the first time, two novel air-sensitive Li-rich organic cathodes (m-TP4OLi and p-TP4OLi) are designed and reported. The structure-performance relationship for the two organic cathodes is comparatively studied. Using organic anode of lithium terephthalate (Li2TP), the resulting Li2TP II p-TP4OLi all-organic Li-ion batteries can deliver the peak discharge capacity of 330 mAh g-1cathode in 1-3.4 V, corresponding to the high energy density of ∼574 Wh kg-1cathode using the median voltage of 1.74 V. Furthermore, the fabricated graphite II p-TP4OLi Li-ion batteries can show the peak discharge capacity of 305 mAh g-1cathode in 1.5-3.4 V with a high median voltage of 2.4 V, resulting in the peak energy density of ∼732 Wh kg-1cathode (2.4 V x 305 mAh g-1). Meanwhile, the graphite II p-TP4OLi Li-ion batteries exhibit impressive device stability over 20000 cycles. To the best of our knowledge, the peak energy density of our p-TP4OLi is currently the world record among Li-rich organic cathodes, absolutely exceeds the energy density of inorganic LiFePO4 (∼544 Wh kg-1), on par with or even superior to inorganic LiCoO2 (∼720 Wh kg-1) in lab conditions.