Organic electrode for non-aqueous potassium-ion batteries

• Published in: Nano energy 2015-11, Vol.18, p.205-211
• Main Authors: Chen, Yanan, Luo, Wei, Carter, Marcus, Zhou, Lihui, Dai, Jiaqi, Fu, Kun, Lacey, Steven, Li, Tian, Wan, Jiayu, Han, Xiaogang, Bao, Yanping, Hu, Liangbing
• Format: Article
• Language: English
• Subjects: High capacity; Non-aqueous; Organic electrode; Potassium-ion batteries; PTCDA
• ISSN: 2211-2855
• DOI: 10.1016/j.nanoen.2015.10.015

Potassium-ion (K-ion) batteries can be an attractive alternative for grid-scale energy storage due to the abundance of K resources. For the first time, we designed and fabricated a non-aqueous K-ion battery (KIB) by employing 3,4,9,10-perylene–tetracarboxylicacid–dianhydride (PTCDA) as the cathode. The PTCDA electrode exhibits a high capacity of 131mAhg−1 in the potential range of 1.5–3.5V vs. K/K+, which corresponds to the insertion of two K ions per PTCDA molecule. The PTCDA cathode also shows great cycling performance, with a capacity retention of 66.1% over 200 cycles. Furthermore, K11PTCDA can be obtained when discharging PTCDA to 0.01V vs. K/K+, which delivers a high capacity of 753mAhg−1. The excellent electrochemical performance makes PTCDA a promising organic electrode based on K-ion chemistry for grid-scale energy storage. [Display omitted] •For the first time, we designed and fabricated a non-aqueous potassium-ion batteries (KIBs) by PTCDA as the cathode.•The PTCDA exhibits a high capacity of 131mAhg−1 in the potential range of 1.5–3.5V vs. K/K+.•PTCDA shows great capacity retention of 66.1% over 200 cycles.•K11PTCDA can be obtained when discharging PTCDA to low voltage.