Covalent Selenium Embedded in Hierarchical Carbon Nanofibers for Ultra-High Areal Capacity Li-Se Batteries

• DOI: 10.1016/j.isci.2020.100919
• Publication Date: 2020-02-17T07:08:49Z
• Authors: Jian Zhou; Maoxin Chen; Tao Wang; Shengyang Li; Qiusheng Zhang; Meng Zhang; Hanjiao Xu; Jialing Liu; Junfei Liang; Jian Zhu; Xiangfeng Duan
• Keywords: Carbon fibers

Lithium selenium (Li-Se) batteries have attracted increasing interest for its high theoretical volumetric capacities up to 3,253 Ah L−1. However, current studies are largely limited electrodes with rather low mass loading and areal capacity, resulting in performance. Herein, we report a design of covalent embedded hierarchical nitrogen-doped carbon nanofibers ([email protected]) ultra-high capacity Li-Se batteries. The [email protected] provide excellent ion electron transport performance, whereas effectively retard polyselenides diffusion during cycling. We show that the battery 1.87 mg cm−2 displays specific 762 mAh g−1 after 2,500 cycles, almost no fading. Furthermore, by 37.31 cm−2, 7.30 is achieved, which greatly exceeds those reported previously