Surong Zheng,Shiwei Yu,Zaka Ullah,Lei Liu,Ledi Chen,Houliang Sun,Mingliang Chen,Liwei Liu,Qi Li
All-solid-state lithium-ion batteries have great scope in the development of advanced secondary batteries owing to their high energy density and nonflammability. However, high contact resistance at the solid/solid (electrode/electrolyte) interface and the possible existence of side reactions limit their large-scale applications. In this study, a π-d conjugated coordination structure was established between a cathode and electrolyte: 2,5-dihydroxy-1,4-benzoquinone (DHBQ) was the cathode and polyvinylidene fluoride-based Li0.33La0.557TiO3 (PVDF-LLTO) polymer was the solid-state electrolyte. First-principle calculations and performed experiments showed that CO and O–H groups in DHBQ can be coordinated with La3+ in LLTO, and this π-d conjugate coordination structure strengthens the contact interface between the electrode material and solid electrolyte, which further increases the cycling life and durability of all-solid-state batteries.
Chenglu Liang,Xuesong Cai,Jinghang Lin,Yuan Chen,Yuxing Xie,Yang Liu
Graphical A π-d conjugated coordination polymer (CCP) Co-TABQ with C=O was used as electrode material for all organic symmetric lithium-ion batteries. The Co-TABQ/Co-TABQ full battery showed excellent rate performance, with the first discharge capacity of 197.7 mAh g −1 at 50 mA g −1 and the cycle capacity of 102.1 mAh g −1 after 50 cycles. Carbonyl rich conjugated polymer electrode materials for lithium-ion batteries possessed the advantages of strong molecular design ability, abundance and high theoretical capacity. In this work, a Co 2+ coordinated conjugated polymer using 2,3,5,6-tetraamino-p-benzoquinone (TABQ) as building block was constructed and developed as electrode material for all organic symmetric lithium-ion batteries, outputting a specific capacity of over 100 mAh g −1 after 50 cycles at 50 mA g −1 . Performances of Co-TABQ in half cells were explored. The Co-TABQ cathode delivered a capacity of 133.3 mAh g −1 after 150 cycles at 20 mA g −1 . When cycled at higher current density of 500 mA g −1 , the capacity gradually increased to 109.4 mAh g −1 after 4000 cycles. The Co-TABQ anode displayed a stable capacity of 568.6 mAh g −1 at 1 A g −1 . The charge transfer within the electrode was greatly reduced due to the metallic centers in the extended conjugated skeleton, and the reversible Li + storage was achieved by the active C=O and imine groups. This work showed the great potential of metal mediated conjugated polymer in Lithium-ion batteries.
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