Tailored Organic Cathode Material with Multi‐Active Site and Compatible Groups for Stable Quasi‐Solid‐State Lithium‐Organic Batteries. (3rd October 2022)

• Record Type: Journal Article
• Authors: Chen, Lan; Cheng, Linqi; Yu, Jie; Chu, Juan; Wang, Heng‐guo; Cui, Fengchao; Zhu, Guangshan
• Is Part Of: Advanced functional materials. Volume 32:Number 49(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-03
• Subjects: interface compatibility -- lithium‐organic batteries -- organic cathodes -- quasi‐solid‐state batteries -- quinone compounds; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202209848
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Quasi‐solid‐state lithium‐organic batteries have attracted widespread attention in view of their high safety, good mechanical strength, compromise ionic conductivity, and environmental friendliness. However, most organic electrode materials suffer from the undesirable interfacial compatibility, thus causing poor cycling stability. Herein, a quinone‐fused aza‐phenazine (THQAP) is reported with multi‐active site and compatible groups as the cathode material for constructing poly(vinylidene fluoride hexafluoro propylene) (PVDF‐HFP)‐based quasi‐solid‐state lithium‐organic batteries. Benefitting from the high compatibility between cathode material (THQAP) and gel polymer electrolytes (PVDF‐HFP), the dissolution and shuttle reaction of THQAP with hydroxyl groups are suppressed compared with its counterparts (QAP) without hydroxyl groups. As a result, THQAP in quasi‐solid‐state lithium‐organic batteries not only delivers excellent reversible capacity of 240 mAh g −1 at 50 mA g −1, but also exhibits stable cyclability with capacity retention of 78% (160 mAh g −1 ) after 200 cycles at 200 mA g −1 . This study offers a promising strategy to develop quasi‐solid‐state lithium‐organic batteries with higher capacity and cycling stability. Abstract : The quinone‐fused aza‐phenazines with multi‐active site and compatible groups are synthesized and used as the cathode materials to construct poly(vinylidene fluoride hexafluoro propylene) (PVDF‐HFP)‐based quasi‐solid‐state lithiumorganic batteries. Experimental analyses and theory calculations demonstrate the existence of the compatibility and strong interaction between the electrode/electrolyte interfaces, which leads to the improved cycling stability and rate performance.