Pyrolyzed Bacterial Cellulose as the Backbone of the Cathode Catalyst-CoFe[sub.2]O[sub.4] for the Li-O[sub.2] Battery

• Published in: Crystals (Basel) Vol. 12; no. 8
• Main Authors: Wang, Xiangjun, Chi, Yongqing, Wu, Peng, Liu, Wen
• Format: Journal Article
• Language: English
• Published: MDPI AG 01.08.2022
• Subjects: Batteries; Cellulose; Chief financial officers; Energy efficiency; China
• ISSN: 2073-4352; 2073-4352
• DOI: 10.3390/cryst12081165

In this paper, CoFe[sub.2]O[sub.4]@pyrolyzed bacterial cellulose (CFO@PBC) nanocomposites were synthesized by a hydrothermal process and an in situ composite technique as the cathode for rechargeable Li-O[sub.2] batteries (LOB). CoFe[sub.2]O[sub.4]@Ketjenblack (CFO@KB) were prepared in the same way as the comparison. The as-prepared materials were characterized by SEM, XRD, and BET. The LOB with CFO@PBC-3 showed a maximum initial discharge capacity of 2660 mAh g[sup.−1] (electrode) at the current density of 100 mAg[sup.−1], while the mass ratio of CoFe[sub.2]O[sub.4] and pyrolyzed bacterial cellulose was 3. The cyclic voltammetry of the CFO@PBC nanocomposite electrodes was investigated at 0.1 mVs[sup.−1] in the voltage window of 2.0-4.5 V. With the limited capacity of 640 mAh g[sup.−1] (electrode), the CFO@PBC-3 electrode showed the best cycle stability and higher cutoff voltage of discharging. The pyrolyzed bacterial cellulose, as the fibrous 3D backbone in CFO@PBC nanocomposite electrodes, produced better results than the CFO@KB.