Engineering the Interfacial Compatibility of a Small-Molecule Quinone Cathode toward Stable Quasi-Solid-State Lithium-Organic Batteries
Jie Yu, Lin Li, Linqi Cheng, Qiong Wu, Lina Zhao, Heng‐guo Wang
Abstract
Stable quasi-solid-state lithium-organic batteries (QSSLOBs) have received widespread attention due to their high energy density, nonflammability, and environmental friendliness. However, the undesirable interfacial compatibility between the organic cathode and polymer electrolytes (PEs) usually results in unsatisfactory performance. Herein, two types of optimized PEs (gel-based PEs, GPEs, and eutectic-based PEs, EPEs) are fabricated and matched with small-molecule quinone (2,3,5,6-tetraaminobenzoquinone, TABQ, and 1,4-benzoquinone, BQ) cathode materials. Benefiting from the heteroatom groups (−NH 2 ) enhancing the cathode–electrolyte interface compatibility, TABQ shows higher electrochemical performance (310.4 mAh g –1 at 50 mA g –1 for the GPE system and 312.6 mAh g –1 at 50 mA g –1 for the EPE system) than its analogue BQ. Additionally, theoretical calculations and detailed electrochemical characterizations confirm the positive effect of the enhanced interface compatibility between TABQ and PEs on the electrochemical properties and also reveal the charge storage mechanism of TABQ. These results show that this strategy of constructing interface compatibility could create a new chapter for the preparation of high-performance QSSLOBs.