Cu–ion induced self-polymerization of Cu phthalocyanine to prepare low-cost organic cathode materials for Li-ion batteries with ultra-high voltage and ultra-fast rate capability. Issue 44 (8th November 2021)

• Record Type: Journal Article
• Authors: Zhang, Haichang; Zhang, Rui; Liu, Xingjiang; Ding, Fei; Shi, Chunsheng; Zhou, Zhen; Zhao, Naiqin
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 44(2021)
• Page Start: 24915
• Page End: 24921
• Publication Date: 2021-11-08
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1ta07742b
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : We confirmed that CuPc monomers used as cathode materials are self-polymerized when charged to a high voltage of 4.4 V. The polymerized CuPc cathode exhibits excellent high rate capability and superior long-term cycling stability. Abstract : High cost, complex synthesis routes and low yield are pressing challenges hindering the practical application of organic battery materials. Herein, copper(ii ) phthalocyanine (CuPc), one of the most frequently used blue pigments, is directly used as a cathode material in lithium ion batteries. CuPc has a well-defined discharge voltage plateau that is higher than 3.6 V. The discharge capacity of CuPc at 1C of 93.1 mA h g −1 is close to the theoretical discharge capacity. Even at a high rate of 50C, the material remains close to its discharge capacity of 1C, without discernible polarization of the voltage. In addition, CuPc maintains 67% of its initial capacity after 1000 cycles at 20C with nearly 100% coulombic efficiency. Additionally, at high charging voltages, the benzene rings between the CuPc molecules undergo self-polymerization reactions that are catalysed by the copper(ii ) ions in CuPc.