Dicarboxylate CaC8H4O4 as a high-performance anode for Li-ion batteries

• Published in: Nano research 2015-02, Vol.8 (2), p.523-532
• Main Authors: Wang, Liping, Zhang, Haiquan, Mou, Chengxu, Cui, Qianling, Deng, Qijiu, Xue, Jing, Dai, Xinyi, Li, Jingze
• Format: Article
• Language: English
• Subjects: Atomic/Molecular Structure and Spectra; Biomedicine; Biotechnology; Chemistry and Materials Science; Condensed Matter Physics; Materials Science; Nanotechnology; Research Article; 二羧酸; 循环性能; 热稳定性; 电极材料; 离子交换反应; 锂离子电池; 阳极; 阳离子置换
• ISSN: 1998-0124; 1998-0000
• DOI: 10.1007/s12274-014-0666-x

Currently, many organic materials are being considered as electrode materials and display good electrochemical behavior. However, the most critical issues related to the wide use of organic electrodes are their low thermal stability and poor cycling performance due to their high solubility in electrolytes. Focusing on one of the most conventional carboxylate organic materials, namely lithium terephthalate Li2CsH4O4, we tackle these typical disadvantages via modifying its molecular structure by cation substitution. CaCsH4O4 and A12（C8H4O4）3 are prepared via a facile cation exchange reaction. Of these, CaCsH4O4 presents the best cycling performance with thermal stability up to 570℃ and capacity of 399 mA.h.g-1, without any capacity decay in the voltage window of 0.005-3.0 V. The molecular, crystal structure, and morphology of CaCsH4O4 are retained during cycling. This cation-substitution strategy brings new perspectives in the synthesis of new materials as well as broadening the applications of organic materials in Li/Na-ion batteries.