Incorporation of Azo-Linkage to Elevate the Redox Potential of Triphenylamine-Based Porous Organic Polymer Cathodes for Li-Ion Batteries

被引：9

作者：

Ahmed, Sadia ^{[1
]}

Amin, Kamran ^{[2
]}

Younis, Muhammad ^{[1
]}

Wei, Zhixiang ^{[2
]}

Huang, Mu-Hua ^{[1
]}

机构：

[1] Beijing Inst Technol, Sch Mat Sci & Engn, 5, Zhongguancun South St, Beijing 100081, Peoples R China

[2] Chinese Acad Sci, Natl Ctr Nanosci & Technol, 11 Zhongguancun North first Alley, Beijing 100190, Peoples R China

来源：

ACS APPLIED ENERGY MATERIALS | 2023年 / 6卷 / 20期

基金：

北京市自然科学基金; 中国国家自然科学基金;

关键词：

porous organic polymers; azo-linkage; redox-activeunits; high-potential organic electrode materials; lithium-ion batteries; CONJUGATED MICROPOROUS POLYMER; ELECTROCHEMICAL PERFORMANCE; FRAMEWORK; INSIGHT; VOLTAGE;

D O I：

10.1021/acsaem.3c01837

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Porous organic polymers with triphenylamine (TPA) subunits have attracted a lot of attention as advanced electrodes for Li-ion batteries (LIBs) but with poor rate performance and low stability. In this work, azo-linkage has been incorporated into TPA-based porous organic polymers to increase the redox potential while maintaining the capacity of TPA. The cathodes based on azo-linked porous organic polymers (Azo-POP-10, Azo-POP-11, and Azo-POP-12) exhibited a high redox potential of 3.8 V and can be charged up to 4.5 V. A stable electrochemical performance is observed and our designed cathodes retain 84% (Azo-POP-10), 87% (Azo-POP-11), and 75% (Azo-POP-12) of their initial capacities at a current density of 1000 mAg(-1). Over 60% capacity retention is observed even after 1000 charge-discharge cycles. Moreover, the cathodes still delivered a stable capacity even at a very high current density of 20,000 mAg(-1), showing excellent stability under fast charging conditions. A cutoff potential of 4.5 V and a current density of 20,000 mAg(-1) are the highest parameters for TPA-based materials to date. The unique material design is mainly responsible for this excellent performance, and we believe that this report can inspire the further development of organic cathodes with fast charging and better stability.

引用

页码：10674 / 10681

页数：8