Perovskite KNi0.1Co0.9F3 as a pseudocapacitive conversion anode for high-performance nonaqueous Li-ion capacitors and dual-ion batteries. Issue 14 (19th March 2019)

• Record Type: Journal Article
• Authors: Xu, Qilei; Ding, Rui; Shi, Wei; Ying, Danfeng; Huang, Yongfa; Yan, Tong; Gao, Ping; Sun, Xiujuan; Liu, Enhui
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 14(2019)
• Page Start: 8315
• Page End: 8326
• Publication Date: 2019-03-19
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9ta00493a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The perovskite KNi0.1 Co0.9 F3 anode with pseudocapacitive conversion properties shows potential applications in nonaqueous Li-ion capacitors and dual-ion batteries. Abstract : Perovskites K–Ni–Co–F (denoted as KNCF) with various Ni/Co ratios have been introduced as high-performance anodes for nonaqueous Li-ion capacitors (LICs) and dual-ion batteries (DIBs). The optimal KNCF (Ni/Co = 1-6) material possesses the stoichiometric formula of KNi0.1 Co0.9 F3 with cubic nanocrystal morphology and hierarchical porous structure. The KNCF (1-6) electrode shows a typical surface conversion reaction mechanism with a synergistic contribution of Ni and Co electroactive species for Li-ion storage. The KNCF (1-6)//activated carbon (AC) LIC with the anode precharged (or prelithiated) exhibits much higher energy/power densities and cycling stability than the non-precharged one, moreover, the overall performance is better than those of the KNCF (1-0)//AC and KNCF (0-1)//AC LICs. Interestingly, the constructed KNCF (1-6)//AC + LiFePO4 (LFP) (1 : 1) LIC exhibits better performance than the KNCF (1-6)//AC LIC by using a capacitor–battery hybrid cathode with higher specific capacity, and the performance of the KNCF (1-6)//AC LIC is also enhanced by the precharging treatment of both the KNCF (1-6) anode and AC cathode. The designed KNCF (1-6)//graphite (918) DIB exhibits better performance than the other three DIBs with the 918 + AC (1 : 1), 918 + LFP (1 : 1) and 918 + AC + LFP (1 : 1 : 1) cathodes. Furthermore, the designed LICs and DIBs also show a remarkable behavior at low (−20 °C) and high (40 °C) temperatures.