High-performance lithium/sulfur batteries by decorating CMK-3/S cathodes with DNA

作者：Li Qiyang; Zhou Chenggang^*; Ji Zhuan; Han Bo; Feng Liang; Wu Jinping

来源：Journal of Materials Chemistry A, 2015, 3(14): 7241-7247.

DOI：10.1039/c4ta06083k

Prohibiting lithium polysulfides from being dissolved to electrolyte is the most critical challenge for pursuing high-performance Li/S batteries. Taking full advantage of interactions between polysulfides and functional groups of third-party additives has been proven to be an efficient strategy. In the present work, we selected DNA to decorate CMK-3/S cathodes. The -P=O and =N-sites of the constituent deoxyribonucleotides of DNA are demonstrated to be capable of anchoring polysulfides through our DFT calculations. The experimental results show that adding a small amount of DNA into the CMK-3/S composite significantly improved the cyclic performance. In particular, with a moderate DNA loading rate, the DNA post-loading procedure resulted in a discharge capacity of 771 mA h g(-1) at 0.1 C after 200 cycles (70.7% retention of the initial), which yielded slightly improved performance as compared to the DNA pre-loading procedure. The proposed DNA decorating scheme may provide an applicable technical solution for developing high-performance Li/S batteries.

• 出版日期2015
• 单位中国地质大学（北京）