Polynitrosoarene Radical as an Efficient Cathode Material for Lithium-Ion Batteries
Fangyuan Kang, Yilin Lin, Shiwei Zhang, Zicong Tan, Xiang Wang, Jinglun Yang, Yung‐Kang Peng, Wenjun Zhang, Chun‐Sing Lee, Weiwei Huang, Qichun Zhang
Abstract
Organic radical batteries (ORBs) with radical-branched polymers as cathode materials represent a valuable alternative to meet the continuously increasing demand on energy storage. However, the low theoretical capacities of current radical-contained compounds strongly hamper their practical applications. To address this issue, a chemically robust polynitrosoarene (tris(4-nitrosophenyl)amine) with a pronounced radical property is rationally designed as an efficient cathode for ORBs. Its unique multi-nitroso structure displays remarkably reversible charge/discharge capability and a superior capacity up to 300 mA h g –1 (93% theoretical capacity) after 100 cycles at 100 mA g –1 within a broad potential window of 1.3–4.3 V (vs Li + /Li). Moreover, the ultra-long cycle life is also achieved at 1000 mA g –1 with 85% preservation of the capacity after 1000 cycles, making it the best-reported organic radical cathode material for lithium-ion batteries.